2010 |
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90. | Yun-Taek Im; Jee-Hoon Lee; Yong-Woo Jeong; Sang-Ik Lee; Seong-Ook Park A Beam-Switchable Coupled Feeding Network in X-band Journal Article Microwave and Optical Technology Letters, 52 , pp. 1865 - 1868, 2010. @article{Im2010e, title = {A Beam-Switchable Coupled Feeding Network in X-band}, author = {Yun-Taek Im and Jee-Hoon Lee and Yong-Woo Jeong and Sang-Ik Lee and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/25313.pdf}, doi = {10.1002/mop.25313}, year = {2010}, date = {2010-08-01}, journal = {Microwave and Optical Technology Letters}, volume = {52}, pages = {1865 - 1868}, abstract = {An antenna feeding network is proposed for a driving system. It consists of branch line couplers, Wilkinson power dividers, and asymmetric delay lines. Using an orthogonal beam property and an antenna sharing technique, its radiation patterns are measured at 10 GHz. The measured beam coverage angle was 70º in the five input ports by using eight radiating elements}, keywords = {}, pubstate = {published}, tppubtype = {article} } An antenna feeding network is proposed for a driving system. It consists of branch line couplers, Wilkinson power dividers, and asymmetric delay lines. Using an orthogonal beam property and an antenna sharing technique, its radiation patterns are measured at 10 GHz. The measured beam coverage angle was 70º in the five input ports by using eight radiating elements |
89. | Byoung-Nam Kim; Seong-Ook Park; Jung-Keun Oh Broadband Built-In Antenna with New Enclosed 3D Coupling Feed Structure Journal Article Microwave and Optical Technology Letters, 52 , pp. 2306 - 2309, 2010. @article{Kim2010, title = {Broadband Built-In Antenna with New Enclosed 3D Coupling Feed Structure}, author = {Byoung-Nam Kim and Seong-Ook Park and Jung-Keun Oh}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Kim_et_al-2010-Microwave_and_Optical_Technology_Letters.pdf}, doi = {10.1002/mop.25441}, year = {2010}, date = {2010-07-14}, journal = {Microwave and Optical Technology Letters}, volume = {52}, pages = {2306 - 2309}, abstract = {Wideband built‐in antenna with an enclosed 3D coupling feed structure for wireless terminals is presented.With the proposed design scheme, a nine‐band built‐in antenna that covers GSM850/GSM900/GPS/DCS1800/PCS1900/WCDMA/WiBro2350/Bluetooth/WiMax 2500 is experimentally tested. This novel nine‐band built‐in handset antenna is developed within the limits of a 40 × 17.5 × 6 mm3 volume, achieving good agreement between measurement and simulation.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Wideband built‐in antenna with an enclosed 3D coupling feed structure for wireless terminals is presented.With the proposed design scheme, a nine‐band built‐in antenna that covers GSM850/GSM900/GPS/DCS1800/PCS1900/WCDMA/WiBro2350/Bluetooth/WiMax 2500 is experimentally tested. This novel nine‐band built‐in handset antenna is developed within the limits of a 40 × 17.5 × 6 mm3 volume, achieving good agreement between measurement and simulation. |
88. | Ki-Bok Kong; Seong-Ook Park Unconditionally Stable LOD-FDTD Method based on the Simplified Sampling Bi-orthogonal Algorithm Journal Article Microwave and Optical Technology Letters, 52 , pp. 2183 - 2185, 2010. @article{Kong2010, title = {Unconditionally Stable LOD-FDTD Method based on the Simplified Sampling Bi-orthogonal Algorithm}, author = {Ki-Bok Kong and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Kong_et_al-2010-Microwave_and_Optical_Technology_Letters-1.pdf}, doi = {10.1002/mop.25461}, year = {2010}, date = {2010-07-14}, journal = {Microwave and Optical Technology Letters}, volume = {52}, pages = {2183 - 2185}, abstract = {This letter presents an unconditionally stable locally one‐dimensional (LOD) finite‐difference time‐domain method based on the simplified sampling biorthogonal algorithm (SSB‐LOD). The suggested approach requires fewer arithmetic operations than in the SSB‐ADI scheme. This leads to a reduction of CPU time relative to the SSB‐ADI method while equivalent numerical accuracy is retained. The numerical implementation of two parallel conducting plate shows that the CPU time of the SSB‐LOD has been reduced to approximately 85% of that of the SSB‐ADI.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This letter presents an unconditionally stable locally one‐dimensional (LOD) finite‐difference time‐domain method based on the simplified sampling biorthogonal algorithm (SSB‐LOD). The suggested approach requires fewer arithmetic operations than in the SSB‐ADI scheme. This leads to a reduction of CPU time relative to the SSB‐ADI method while equivalent numerical accuracy is retained. The numerical implementation of two parallel conducting plate shows that the CPU time of the SSB‐LOD has been reduced to approximately 85% of that of the SSB‐ADI. |
87. | Byung-Chan Kim; Seong-Ook Park Reduction of Averaging Time for Evaluation of Human Exposure to Radio frequency Electromagnetic Fields from Cellular Base Stations Journal Article IEICE Transactions on Communications, E93.B , pp. 1862 - 1864, 2010. @article{Kim2010b, title = {Reduction of Averaging Time for Evaluation of Human Exposure to Radio frequency Electromagnetic Fields from Cellular Base Stations}, author = {Byung-Chan Kim and Seong-Ook Park}, doi = {10.1587/transcom.E93.B.1862}, year = {2010}, date = {2010-07-01}, journal = {IEICE Transactions on Communications}, volume = {E93.B}, pages = {1862 - 1864}, abstract = {In order to determine exposure compliance with the electromagnetic fields from a base station's antenna in the far-field region, we should calculate the spatially averaged field value in a defined space. This value is calculated based on the measured value obtained at several points within the restricted space. According to the ICNIRP guidelines, at each point in the space, the reference levels are averaged over any 6min (from 100kHz to 10GHz) for the general public. Therefore, the more points we use, the longer the measurement time becomes. For practical application, it is very advantageous to spend less time for measurement. In this paper, we analyzed the difference of average values between 6min and lesser periods and compared it with the standard uncertainty for measurement drift. Based on the standard deviation from the 6min averaging value, the proposed minimum averaging time is 1min.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In order to determine exposure compliance with the electromagnetic fields from a base station's antenna in the far-field region, we should calculate the spatially averaged field value in a defined space. This value is calculated based on the measured value obtained at several points within the restricted space. According to the ICNIRP guidelines, at each point in the space, the reference levels are averaged over any 6min (from 100kHz to 10GHz) for the general public. Therefore, the more points we use, the longer the measurement time becomes. For practical application, it is very advantageous to spend less time for measurement. In this paper, we analyzed the difference of average values between 6min and lesser periods and compared it with the standard uncertainty for measurement drift. Based on the standard deviation from the 6min averaging value, the proposed minimum averaging time is 1min. |
86. | Jung-Hwan Choi; Seong-Ook Park Generation of Rayleigh/Rician Fading Channels With Variable RMS Delay by Changing Boundary Conditions of the Reverberation Chamber Journal Article IEEE Antennas and Wireless Propagation Letters, 9 , pp. 510 - 513, 2010. @article{Choi2010c, title = {Generation of Rayleigh/Rician Fading Channels With Variable RMS Delay by Changing Boundary Conditions of the Reverberation Chamber}, author = {Jung-Hwan Choi and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/05473103.pdf}, doi = {10.1109/LAWP.2010.2051400}, year = {2010}, date = {2010-05-27}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {9}, pages = {510 - 513}, abstract = {This letter presents the properties of the generated Rayleigh/Rician fading channels in the reverberation chamber (RC) experimentally. Radio propagation channels that undergo multipath fading phenomena can be characterized by power delay profiles (PDPs), delay spreads, and statistical distributions of the received power. The RC under the conventional configuration for electromagnetic compatibility/electromagnetic interference (EMC/EMI) evaluations has Rayleigh distribution because there are no direct paths between the TX and RX antennas. Most of the transmitted signals arrive at the RX part through multiple reflection paths. By changing the boundary conditions and the position of the TX antenna, Rayleigh/Rician fading channels with variable root-mean-square (RMS) delay spread can be generated in the RC considering K-factor simultaneously.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This letter presents the properties of the generated Rayleigh/Rician fading channels in the reverberation chamber (RC) experimentally. Radio propagation channels that undergo multipath fading phenomena can be characterized by power delay profiles (PDPs), delay spreads, and statistical distributions of the received power. The RC under the conventional configuration for electromagnetic compatibility/electromagnetic interference (EMC/EMI) evaluations has Rayleigh distribution because there are no direct paths between the TX and RX antennas. Most of the transmitted signals arrive at the RX part through multiple reflection paths. By changing the boundary conditions and the position of the TX antenna, Rayleigh/Rician fading channels with variable root-mean-square (RMS) delay spread can be generated in the RC considering K-factor simultaneously. |
85. | Yun-Taek Im; Jee-Hoon Lee; Yong-Woo Jeong; Sang-Ik Lee; Seong-Ook Park A Polarization Selective Series-Fed Array Antenna Journal Article Microwave and Optical Technology Letters, 52 , pp. 1861 - 1864, 2010. @article{Im2010d, title = {A Polarization Selective Series-Fed Array Antenna}, author = {Yun-Taek Im and Jee-Hoon Lee and Yong-Woo Jeong and Sang-Ik Lee and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Im_et_al-2010-Microwave_and_Optical_Technology_Letters.pdf}, doi = {10.1002/mop.25323}, year = {2010}, date = {2010-05-18}, journal = {Microwave and Optical Technology Letters}, volume = {52}, pages = {1861 - 1864}, abstract = {A series‐fed elliptically polarized array antenna is proposed for X‐band systems. Symmetrical series feeding at the array antenna center and truncated patches are applied to reduce side lobe levels (SLL) by modeling the array factor. A series‐fed elliptically polarized array antenna is proposed for X‐band systems. Symmetrical series feeding at the array antenna center and truncated patches are applied to reduce SLLs by modeling the array factor. The measured gain is 24.8 dBic and the axial ratio is between 3 and 6 dB. The SLLs are −19.0 and −16.2 dB in the zx and yz plane, respectively.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A series‐fed elliptically polarized array antenna is proposed for X‐band systems. Symmetrical series feeding at the array antenna center and truncated patches are applied to reduce side lobe levels (SLL) by modeling the array factor. A series‐fed elliptically polarized array antenna is proposed for X‐band systems. Symmetrical series feeding at the array antenna center and truncated patches are applied to reduce SLLs by modeling the array factor. The measured gain is 24.8 dBic and the axial ratio is between 3 and 6 dB. The SLLs are −19.0 and −16.2 dB in the zx and yz plane, respectively. |
84. | Jung-Hwan Choi; Jee-Hoon Lee; Seong-Ook Park Characterizing the Impact of Moving Mode-Stirrers on the Doppler Spread Spectrum in a Reverberation Chamber Journal Article IEEE Antennas and Wireless Propagation Letters, 9 , pp. 375 - 378, 2010. @article{Choi2010b, title = {Characterizing the Impact of Moving Mode-Stirrers on the Doppler Spread Spectrum in a Reverberation Chamber}, author = {Jung-Hwan Choi and Jee-Hoon Lee and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/05456176.pdf}, doi = {10.1109/LAWP.2010.2049331}, year = {2010}, date = {2010-04-29}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {9}, pages = {375 - 378}, abstract = {A moving mode-stirrer in a reverberation chamber (RC) not only changes the field distributions within the reverberation chamber, but also causes a Doppler effect. In this letter, the Doppler spread spectrum of a received signal in a reverberation chamber is characterized according to the radius and rotational velocity of the mode-stirrers and TX antenna positions.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A moving mode-stirrer in a reverberation chamber (RC) not only changes the field distributions within the reverberation chamber, but also causes a Doppler effect. In this letter, the Doppler spread spectrum of a received signal in a reverberation chamber is characterized according to the radius and rotational velocity of the mode-stirrers and TX antenna positions. |
83. | Jung-Hwan Choi; Seong-Ook Park Exact Evaluation of Channel Capacity Difference of MIMO Handset Antenna Arrays Journal Article IEEE Antennas and Wireless Propagation Letters, 9 (219 - 222), 2010. @article{Choi2010, title = {Exact Evaluation of Channel Capacity Difference of MIMO Handset Antenna Arrays}, author = {Jung-Hwan Choi and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/05439981.pdf}, doi = {10.1109/LAWP.2010.2046710}, year = {2010}, date = {2010-03-29}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {9}, number = {219 - 222}, abstract = {This letter presents the exact evaluation of the channel capacity difference of different 2 × 2 multiple-input-multiple-output (MIMO) handset antenna configurations. In order to investigate the performance enhancement of a MIMO antenna system, the channel capacity is estimated in a reverberation chamber with the normalized channel matrix measured using a network analyzer under the conventional configuration for electromagnetic compatibility/electromagnetic interference (EMC/EMI) evaluations. However, performance comparison of different antenna configurations at the same signal-to-noise ratio (SNR) is not an exact evaluation in the same propagation environment because the received power is obviously different. We propose the evaluation method for exact performance comparisons and drive the exact representation of the channel capacity difference of MIMO handset antenna arrays in a reverberation chamber. The estimated results using the proposed method are compared to the channel capacity evaluated at the same SNR for validation.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This letter presents the exact evaluation of the channel capacity difference of different 2 × 2 multiple-input-multiple-output (MIMO) handset antenna configurations. In order to investigate the performance enhancement of a MIMO antenna system, the channel capacity is estimated in a reverberation chamber with the normalized channel matrix measured using a network analyzer under the conventional configuration for electromagnetic compatibility/electromagnetic interference (EMC/EMI) evaluations. However, performance comparison of different antenna configurations at the same signal-to-noise ratio (SNR) is not an exact evaluation in the same propagation environment because the received power is obviously different. We propose the evaluation method for exact performance comparisons and drive the exact representation of the channel capacity difference of MIMO handset antenna arrays in a reverberation chamber. The estimated results using the proposed method are compared to the channel capacity evaluated at the same SNR for validation. |
82. | Rashid Ahmad Bhatti; Soon-Gyu Yi; Seong-Ook Park Compact Antenna Array With Port Decoupling for LTE-Standardized Mobile Phones Journal Article IEEE Antennas and Wireless Propagation Letters, 8 , pp. 1430 - 1433, 2010. @article{Bhatti2010, title = {Compact Antenna Array With Port Decoupling for LTE-Standardized Mobile Phones}, author = {Rashid Ahmad Bhatti and Soon-Gyu Yi and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/05382565.pdf}, doi = {0.1109/LAWP.2010.2040677}, year = {2010}, date = {2010-01-15}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {8}, pages = {1430 - 1433}, abstract = {A compact dual-element antenna has been designed at 710 MHz for newly emerging long-term evolution (LTE) personal wireless communication standard applications. The proposed antenna consists of two printed meander-line monopoles with edge-to-edge separation of nearly ¿/45. The antenna elements are printed on FR-4 substrate and are located at the top edge of the ground plane measuring 50 × 87 mm2. An LC-components-based branchline hybrid coupler is used to decouple the antenna elements. The prototype antenna has been evaluated through the scattering parameters, radiation patterns, envelope cross correlation, and the channel capacity measurements. Isolation between the ports is better than 35 dB with matched ports at 710 MHz. The antenna offers reasonable multiple-input-multiple-output (MIMO) performances that make it suitable for LTE-standardized mobile phones.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A compact dual-element antenna has been designed at 710 MHz for newly emerging long-term evolution (LTE) personal wireless communication standard applications. The proposed antenna consists of two printed meander-line monopoles with edge-to-edge separation of nearly ¿/45. The antenna elements are printed on FR-4 substrate and are located at the top edge of the ground plane measuring 50 × 87 mm2. An LC-components-based branchline hybrid coupler is used to decouple the antenna elements. The prototype antenna has been evaluated through the scattering parameters, radiation patterns, envelope cross correlation, and the channel capacity measurements. Isolation between the ports is better than 35 dB with matched ports at 710 MHz. The antenna offers reasonable multiple-input-multiple-output (MIMO) performances that make it suitable for LTE-standardized mobile phones. |
2009 |
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81. | Ki-Bok Kong; Seong-Ook Park Analysis of Simplified SB-ADI Scheme for Two-Dimensional Maxwell’s Equations Journal Article IEEE Antennas and Wireless Propagation Letters, 8 , pp. 1002 - 1005, 2009. @article{Kong2009, title = {Analysis of Simplified SB-ADI Scheme for Two-Dimensional Maxwell’s Equations}, author = {Ki-Bok Kong and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/05184859.pdf}, doi = {10.1109/LAWP.2009.2028663}, year = {2009}, date = {2009-07-31}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {8}, pages = {1002 - 1005}, abstract = {This letter represents a simplified sampling biorthogonal alternating-direction implicit (SSB-ADI) method based on the sampling biorthogonal time domain (SBTD) algorithm. Two sampling functions with different orders for sampling biorthogonal method are used to display spatial discretization. Dispersion and stability analyses are presented. It is shown through a numerical simulation that SSB-ADI reduced the CPU time and memory compared to the SB-ADI method.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This letter represents a simplified sampling biorthogonal alternating-direction implicit (SSB-ADI) method based on the sampling biorthogonal time domain (SBTD) algorithm. Two sampling functions with different orders for sampling biorthogonal method are used to display spatial discretization. Dispersion and stability analyses are presented. It is shown through a numerical simulation that SSB-ADI reduced the CPU time and memory compared to the SB-ADI method. |
80. | Rashid Ahmad Bhatti; Yun-Taek Im; Seong-Ook Park Compact PIFA for Mobile Terminals Supporting Multiple Cellular and Non-Cellular Standards Journal Article IEEE Transactions on Antennas and Propagation, 57 , pp. 2534 - 2540, 2009. @article{Bhatti2009, title = {Compact PIFA for Mobile Terminals Supporting Multiple Cellular and Non-Cellular Standards}, author = {Rashid Ahmad Bhatti and Yun-Taek Im and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/05159510.pdf}, doi = {10.1109/TAP.2009.2027086}, year = {2009}, date = {2009-07-07}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {57}, pages = {2534 - 2540}, abstract = {A novel multiband planar inverted-F antenna (PIFA) covering ten frequency bands has been proposed for personal wireless communications terminals. The design is based on the combination of various techniques that are used for designing multiband/broadband antennas. We used a shorted parasitic patch efficiently coupled to the driven patch, a quarter-wave resonator connected to the feed strip in parallel with the main patch, and four slits in the main radiator to excite various current modes in the antenna structure. The antenna is designed within a volume of 4.0 times 2.0 times 0.8 cm3 and it can be used to serve the following wireless communication systems: Global System for Mobile Communications (GSM-900), Digital Communications System (DCS), Personal Communication Service (PCS), Universal Mobile Telecommunications System (UMTS), WiBro at 2.35 GHz, Bluetooth, Satellite-Digital Multimedia Broadcasting (SDM-B) at 2.65 GHz, WiMAX at 3.5 GHz, and the two bands (5.15-5.35 GHz and 5.725-5.875 GHz) for the wireless Local Area Network (WLAN) standards. A prototype antenna was fabricated and tested for input reflection coefficient and radiation performances. The measured and simulated results have been presented and discussed. Important geometrical parameters determining the multiband performances of the antenna have been explained in the paper.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A novel multiband planar inverted-F antenna (PIFA) covering ten frequency bands has been proposed for personal wireless communications terminals. The design is based on the combination of various techniques that are used for designing multiband/broadband antennas. We used a shorted parasitic patch efficiently coupled to the driven patch, a quarter-wave resonator connected to the feed strip in parallel with the main patch, and four slits in the main radiator to excite various current modes in the antenna structure. The antenna is designed within a volume of 4.0 times 2.0 times 0.8 cm3 and it can be used to serve the following wireless communication systems: Global System for Mobile Communications (GSM-900), Digital Communications System (DCS), Personal Communication Service (PCS), Universal Mobile Telecommunications System (UMTS), WiBro at 2.35 GHz, Bluetooth, Satellite-Digital Multimedia Broadcasting (SDM-B) at 2.65 GHz, WiMAX at 3.5 GHz, and the two bands (5.15-5.35 GHz and 5.725-5.875 GHz) for the wireless Local Area Network (WLAN) standards. A prototype antenna was fabricated and tested for input reflection coefficient and radiation performances. The measured and simulated results have been presented and discussed. Important geometrical parameters determining the multiband performances of the antenna have been explained in the paper. |
79. | Young-Bae Jung; Alexander V. Shishlov; Seong-Ook Park Cassegrain Antenna With Hybrid Beam Steering Scheme for Mobile Satellite Communications Journal Article IEEE Transactions on Antennas and Propagation, 57 , pp. 1367 - 1372, 2009. @article{Jung2009, title = {Cassegrain Antenna With Hybrid Beam Steering Scheme for Mobile Satellite Communications}, author = {Young-Bae Jung and Alexander V. Shishlov and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04909463.pdf}, doi = {10.1109/TAP.2009.2016706}, year = {2009}, date = {2009-05-05}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {57}, pages = {1367 - 1372}, abstract = {A hybrid antenna (HA) with a modified beam steering method is proposed. This antenna has a Cassegrain structure composed of two reflectors and a feeder. The parabolic-shaped main reflector is designed for high gain, while the subreflector is rotational and flat. The feeder is a phased array with arbitrary shaped aperture and 20 element antennas. The HA is capable of two-dimensional beam steering by means of two operations: rotation of the subreflector and phase control of the feed array. The subreflector is small in size and weight, so it can provide rapid beam scanning. Designed to be loaded in vehicles, the HA and can communicate with satellites on the move by tracking the beam control of the feed array. A prototype of the HA is fabricated with aluminum using a machining center operated by computerized numerical control. The prototype is operated at Ka-band for TX and K-band for RX with gains of 47 dBi and 44.4 dBi, respectively, at a steering angle of 0 deg. The two-dimensional beam steering within plusmn2deg with respect to 45deg elevation is realized by the subreflector and feed array. All radiation patterns in the beam steering zone meet ITU-R s.465-5 regulations.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A hybrid antenna (HA) with a modified beam steering method is proposed. This antenna has a Cassegrain structure composed of two reflectors and a feeder. The parabolic-shaped main reflector is designed for high gain, while the subreflector is rotational and flat. The feeder is a phased array with arbitrary shaped aperture and 20 element antennas. The HA is capable of two-dimensional beam steering by means of two operations: rotation of the subreflector and phase control of the feed array. The subreflector is small in size and weight, so it can provide rapid beam scanning. Designed to be loaded in vehicles, the HA and can communicate with satellites on the move by tracking the beam control of the feed array. A prototype of the HA is fabricated with aluminum using a machining center operated by computerized numerical control. The prototype is operated at Ka-band for TX and K-band for RX with gains of 47 dBi and 44.4 dBi, respectively, at a steering angle of 0 deg. The two-dimensional beam steering within plusmn2deg with respect to 45deg elevation is realized by the subreflector and feed array. All radiation patterns in the beam steering zone meet ITU-R s.465-5 regulations. |
78. | Jee-Hoon Lee; Jung-Man Hwang; Dong-Hyuk Choi; Seong-Ook Park Noninvasive Biosignal Detection Radar System Using Circular Polarization Journal Article IEEE Transactions on Information Technology in Biomedicine, 13 , pp. 400 - 404, 2009. @article{Lee2009, title = {Noninvasive Biosignal Detection Radar System Using Circular Polarization}, author = {Jee-Hoon Lee and Jung-Man Hwang and Dong-Hyuk Choi and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04814665.pdf}, doi = {10.1109/TITB.2009.2018623}, year = {2009}, date = {2009-04-14}, journal = {IEEE Transactions on Information Technology in Biomedicine}, volume = {13}, pages = {400 - 404}, abstract = {This paper proposes an integrated hypersensitive Doppler radar system through a circular polarization characteristic. Through the idea of a reverse sense of rotation when the reflecting surface is perfectly conducting, it is shown that the detecting property of the system can be effectively improved by using antennas that have a reverse polarization. This bistatic radar system can be used in noninvasively sensing biosignals such as respiration and heart rates with the periodic movement of skin and muscle near the heart. The operating frequency of the system is in the X-band and the radar size is 95 times 50 times 13 mm3.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper proposes an integrated hypersensitive Doppler radar system through a circular polarization characteristic. Through the idea of a reverse sense of rotation when the reflecting surface is perfectly conducting, it is shown that the detecting property of the system can be effectively improved by using antennas that have a reverse polarization. This bistatic radar system can be used in noninvasively sensing biosignals such as respiration and heart rates with the periodic movement of skin and muscle near the heart. The operating frequency of the system is in the X-band and the radar size is 95 times 50 times 13 mm3. |
77. | Manh-Tuan Dao; Viet-Anh Nguyen; Seong-Ook Park Derivation and Analysis of Spatial Correlation for 2 X 2 MIMO System Journal Article IEEE Antennas and Wireless Propagation Letters, 8 , pp. 409 - 413, 2009. @article{Dao2009, title = {Derivation and Analysis of Spatial Correlation for 2 X 2 MIMO System}, author = {Manh-Tuan Dao and Viet-Anh Nguyen and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04810122.pdf}, doi = {10.1109/LAWP.2009.2019733}, year = {2009}, date = {2009-04-03}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {8}, pages = {409 - 413}, abstract = {This letter derives and analyzes the spatial correlation based on a physically intuitional stochastic channel model for multiple-input-multiple-output (MIMO) systems using polarized and isolated antenna arrays. Simulations for a 2 times 2 MIMO system were performed using dipole antennas with various configurations to investigate the effects of polarization, pattern of elements, and cross-polarization discrimination (XPD) on the spatial correlation. Results show that the correlation is very sensitive to the orthogonality of pattern and polarization. Furthermore, XPD slightly affects the spatial correlation.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This letter derives and analyzes the spatial correlation based on a physically intuitional stochastic channel model for multiple-input-multiple-output (MIMO) systems using polarized and isolated antenna arrays. Simulations for a 2 times 2 MIMO system were performed using dipole antennas with various configurations to investigate the effects of polarization, pattern of elements, and cross-polarization discrimination (XPD) on the spatial correlation. Results show that the correlation is very sensitive to the orthogonality of pattern and polarization. Furthermore, XPD slightly affects the spatial correlation. |
76. | Jung-Hwan Choi; Yong-Sun Shin; Seong-Ook Park Performance Evaluation of 2×2 MIMO Handset Antenna Arrays for Mobile WiMAX Applications Journal Article Microwave and Optical Technology Letters, 51 , pp. 1558 - 1561, 2009. @article{Choi2009, title = {Performance Evaluation of 2×2 MIMO Handset Antenna Arrays for Mobile WiMAX Applications}, author = {Jung-Hwan Choi and Yong-Sun Shin and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Choi_et_al-2009-Microwave_and_Optical_Technology_Letters.pdf}, doi = {10.1002/mop.24344}, year = {2009}, date = {2009-03-20}, journal = {Microwave and Optical Technology Letters}, volume = {51}, pages = {1558 - 1561}, abstract = {This article presents the performance analysis of the multiple‐input–multiple‐output antenna systems for mobile WiMAX handset applications. To investigate the effect of changing antenna arrangements on the antenna performance, we propose four kinds of two antenna structures considering the practical ground size of a mobile handset. To estimate the proposed structures, mutual coupling and envelope correlations were considered. Also the channel capacity and correlation were measured in the reverberation chamber. The relations between all parameters were analyzed based on the measured results.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This article presents the performance analysis of the multiple‐input–multiple‐output antenna systems for mobile WiMAX handset applications. To investigate the effect of changing antenna arrangements on the antenna performance, we propose four kinds of two antenna structures considering the practical ground size of a mobile handset. To estimate the proposed structures, mutual coupling and envelope correlations were considered. Also the channel capacity and correlation were measured in the reverberation chamber. The relations between all parameters were analyzed based on the measured results. |
75. | Rashid Ahmad Bhatti; Jung-Hwan Choi; Seong-Ook Park Quad-Band MIMO Antenna Array for Portable Wireless Communications Terminals Journal Article IEEE Antennas and Wireless Propagation Letters, 8 , pp. 129 - 132, 2009. @article{Bhatti2009b, title = {Quad-Band MIMO Antenna Array for Portable Wireless Communications Terminals}, author = {Rashid Ahmad Bhatti and Jung-Hwan Choi and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04745776.pdf}, doi = {10.1109/LAWP.2008.2012274}, year = {2009}, date = {2009-01-09}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {8}, pages = {129 - 132}, abstract = {A low-profile quad-band antenna array for multiple-input-multiple-output (MIMO)-enabled wireless communication terminals has been presented in this letter. The proposed dual-element antenna array operates at the following frequency bands: 2.4-2.5 GHz, 3.4-3.6 GHz, 5.15-5.35 GHz, and 5.75-5.875 GHz. A combination of a C-shaped slot and a T-shaped slit is used to excite three current modes in a conventional single-band planar inverted-F antenna (PIFA). A lambda/4 resonator is integrated into the triband antenna structure in order to get an additional resonance for quad-band operation. The proposed array has been designed over a small ground plane measuring 50times100 mm2, whereas each element in the array occupies a volume of 0.63 cm3. Mean effective gain (MEG) and envelop correlation analysis have been used for the array analysis in addition to the capacity and diversity gain measurements in a reverberation chamber. The prototype array exhibits quite low mutual coupling with good input return losses at the desired four frequency bands.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A low-profile quad-band antenna array for multiple-input-multiple-output (MIMO)-enabled wireless communication terminals has been presented in this letter. The proposed dual-element antenna array operates at the following frequency bands: 2.4-2.5 GHz, 3.4-3.6 GHz, 5.15-5.35 GHz, and 5.75-5.875 GHz. A combination of a C-shaped slot and a T-shaped slit is used to excite three current modes in a conventional single-band planar inverted-F antenna (PIFA). A lambda/4 resonator is integrated into the triband antenna structure in order to get an additional resonance for quad-band operation. The proposed array has been designed over a small ground plane measuring 50times100 mm2, whereas each element in the array occupies a volume of 0.63 cm3. Mean effective gain (MEG) and envelop correlation analysis have been used for the array analysis in addition to the capacity and diversity gain measurements in a reverberation chamber. The prototype array exhibits quite low mutual coupling with good input return losses at the desired four frequency bands. |
2008 |
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74. | Young-Bae Jung; Seong-Ook Park Ka-band Shaped Reflector Hybrid Antenna Iluminated by Microstrip-fed Horn Array Journal Article IEEE Transactions on Antennas and Propagation, 56 , pp. 3863 - 3867, 2008. @article{Jung2008, title = {Ka-band Shaped Reflector Hybrid Antenna Iluminated by Microstrip-fed Horn Array}, author = {Young-Bae Jung and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04718036.pdf}, doi = {10.1109/TAP.2008.2007402}, year = {2008}, date = {2008-12-01}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {56}, pages = {3863 - 3867}, abstract = {The numerical simulation and experimental results of a shaped reflector hybrid antenna (SRHA) structure are presented. The SRHA design was optimized for a scan range of plusmn3deg for a broadside of 45deg in elevation to maintain a gain of more than 38 dBi and low side-lobes. The designed SRHA has an aperture size of less than 60 times 70 m2 and an offset structure for a low profile to meet the need for a mobile satellite platform. The antenna geometry and reflector surface was determined by a geometrical optic (GO) method and the radiation pattern was obtained by physical optic (PO) analysis. A microstrip horn array was used as a feeder and was composed of eight elements. The number of array elements was chosen so as to maximize antenna performances, such as gain and efficiency, without overdesign. The SRHA breadboard, including a shaped reflector and a feed horn array, was fabricated and measured. The measured results showed good agreement with the simulation and met the performance required of SRHA.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The numerical simulation and experimental results of a shaped reflector hybrid antenna (SRHA) structure are presented. The SRHA design was optimized for a scan range of plusmn3deg for a broadside of 45deg in elevation to maintain a gain of more than 38 dBi and low side-lobes. The designed SRHA has an aperture size of less than 60 times 70 m2 and an offset structure for a low profile to meet the need for a mobile satellite platform. The antenna geometry and reflector surface was determined by a geometrical optic (GO) method and the radiation pattern was obtained by physical optic (PO) analysis. A microstrip horn array was used as a feeder and was composed of eight elements. The number of array elements was chosen so as to maximize antenna performances, such as gain and efficiency, without overdesign. The SRHA breadboard, including a shaped reflector and a feed horn array, was fabricated and measured. The measured results showed good agreement with the simulation and met the performance required of SRHA. |
73. | Byoung-Nam Kim; Hyung-Do Choi; Seong-Ook Park Methods of evaluating human exposure to electromagnetic fields radiated from operating base stations in Korea Journal Article Bioelectromagnetics, 29 , pp. 579 - 582, 2008. @article{Kim2008, title = {Methods of evaluating human exposure to electromagnetic fields radiated from operating base stations in Korea}, author = {Byoung-Nam Kim and Hyung-Do Choi and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Kim_et_al-2008-Bioelectromagnetics.pdf}, doi = {10.1002/bem.20416}, year = {2008}, date = {2008-10-29}, journal = {Bioelectromagnetics}, volume = {29}, pages = {579 - 582}, abstract = {This article presents measurement methods used to determine the human exposure to electromagnetic fields radiated from operating base stations. In Korea, when evaluating the human exposure to electromagnetic fields from operating base stations, the measurement procedure is different between the following cases: in situ measurement and electromagnetic environment measurement. When performing an in situ measurement, compliance with human exposure limits is determined by the spatially averaged field value obtained within the space occupied by humans at one arbitrary position, but when performing an electromagnetic environment measurement, it is determined by the maximum value at the highest field position selected from several places.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This article presents measurement methods used to determine the human exposure to electromagnetic fields radiated from operating base stations. In Korea, when evaluating the human exposure to electromagnetic fields from operating base stations, the measurement procedure is different between the following cases: in situ measurement and electromagnetic environment measurement. When performing an in situ measurement, compliance with human exposure limits is determined by the spatially averaged field value obtained within the space occupied by humans at one arbitrary position, but when performing an electromagnetic environment measurement, it is determined by the maximum value at the highest field position selected from several places. |
72. | Rashid Ahmad Bhatti; Yun-Taek Im; Jung-Hwan Choi; Manh-Tuan Dao; Seong-Ook Park Ultra-Thin Planar Inverted-F Antenna (PIFA) for Multi-Standard Handsets Journal Article Microwave and Optical Technology Letters, 50 , 2008. @article{Bhatti2008, title = {Ultra-Thin Planar Inverted-F Antenna (PIFA) for Multi-Standard Handsets}, author = {Rashid Ahmad Bhatti and Yun-Taek Im and Jung-Hwan Choi and Manh-Tuan Dao and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Bhatti_et_al-2008-Microwave_and_Optical_Technology_Letters.pdf}, doi = {10.1002/mop.23808}, year = {2008}, date = {2008-08-30}, journal = {Microwave and Optical Technology Letters}, volume = {50}, abstract = {A compact multiband internal antenna has been proposed for multistandard personal communication handsets. The antenna simultaneously covers various frequency bands such as GSM, DCS, PCS, UMTS, WiBro, Bluetooth, S‐DMB, and WLAN. Total volume of the antenna is 0.78 cm3 (2.6 cm × 1.5 cm × 0.2 cm) that makes it attractive for multiband slim handsets. Measured performances of the prototype antenna are acceptable at all the targeted frequency bands}, keywords = {}, pubstate = {published}, tppubtype = {article} } A compact multiband internal antenna has been proposed for multistandard personal communication handsets. The antenna simultaneously covers various frequency bands such as GSM, DCS, PCS, UMTS, WiBro, Bluetooth, S‐DMB, and WLAN. Total volume of the antenna is 0.78 cm3 (2.6 cm × 1.5 cm × 0.2 cm) that makes it attractive for multiband slim handsets. Measured performances of the prototype antenna are acceptable at all the targeted frequency bands |
71. | Ki-Bok Kong; Yong-Sun Shin; Seong-Ook Park; Jong-Sung Kim The Simplest V-Cycle Fast Adaptive Composite Grid ADI-FDTD Method for Two-Dimensional Electromagnetic Simulations Journal Article IEEE Antennas and Wireless Propagation Letters, 7 , pp. 451 - 455, 2008. @article{Kong2008, title = {The Simplest V-Cycle Fast Adaptive Composite Grid ADI-FDTD Method for Two-Dimensional Electromagnetic Simulations}, author = {Ki-Bok Kong and Yong-Sun Shin and Seong-Ook Park and Jong-Sung Kim}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04570251.pdf}, doi = {10.1109/LAWP.2008.2002316}, year = {2008}, date = {2008-07-18}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {7}, pages = {451 - 455}, abstract = {An alternating-direction-implicit finite-difference time-domain (ADI-FDTD) method based on the fast-adaptive-composite grid ADI (FAC-ADI) scheme is introduced to reduce the truncation error generated when ADI-FDTD is derived from the Crank-Nicolson (CN) ADI scheme, and its efficiency is investigated. The relaxation equation and residual equation for FAC-FDTD are constructed by defining the error vector between the traditional ADI and CN FDTD formulas, and the iterative formulas are defined using the iterative schemes. A comparison of the computational efficiency between the FAC-ADI and ADI-FDTD is presented.}, keywords = {}, pubstate = {published}, tppubtype = {article} } An alternating-direction-implicit finite-difference time-domain (ADI-FDTD) method based on the fast-adaptive-composite grid ADI (FAC-ADI) scheme is introduced to reduce the truncation error generated when ADI-FDTD is derived from the Crank-Nicolson (CN) ADI scheme, and its efficiency is investigated. The relaxation equation and residual equation for FAC-FDTD are constructed by defining the error vector between the traditional ADI and CN FDTD formulas, and the iterative formulas are defined using the iterative schemes. A comparison of the computational efficiency between the FAC-ADI and ADI-FDTD is presented. |
70. | Viet-Anh Nguyen; Manh-Tuan Dao; Yun-Taek Im; Seong-Ook Park A Compact Tunable Internal Antenna for Personal Communication Handsets Journal Article IEEE Antennas and Wireless Propagation Letters, 7 , pp. 569 - 572, 2008. @article{Nguyen2008, title = {A Compact Tunable Internal Antenna for Personal Communication Handsets}, author = {Viet-Anh Nguyen and Manh-Tuan Dao and Yun-Taek Im and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04564188.pdf}, doi = {10.1109/LAWP.2008.2001918}, year = {2008}, date = {2008-07-15}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {7}, pages = {569 - 572}, abstract = {This letter presents a compact tunable internal planar inverted-F antenna (PIFA) for personal communication handset applications. The antenna operates at following frequency bands: DCS, PCS, UMTS, WiBro, WiMax and/or WiBro phase 3, and WLAN. A single varactor diode is attached to the antenna in a proper location between the main patch and supplemental patch in order to get tuning over the wide frequency range around 2 GHz. The antenna was designed and optimized by using CST microwave studio program. Measured return losses (S11) and radiation patterns of the antenna were carried on Anritsu 37377C Vector Network Analyzer and in standard anechoic chamber room. The surface current distributions, the co-polarization and cross-polarization patterns of the antenna are given to demonstrate the antenna's performance.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This letter presents a compact tunable internal planar inverted-F antenna (PIFA) for personal communication handset applications. The antenna operates at following frequency bands: DCS, PCS, UMTS, WiBro, WiMax and/or WiBro phase 3, and WLAN. A single varactor diode is attached to the antenna in a proper location between the main patch and supplemental patch in order to get tuning over the wide frequency range around 2 GHz. The antenna was designed and optimized by using CST microwave studio program. Measured return losses (S11) and radiation patterns of the antenna were carried on Anritsu 37377C Vector Network Analyzer and in standard anechoic chamber room. The surface current distributions, the co-polarization and cross-polarization patterns of the antenna are given to demonstrate the antenna's performance. |
69. | Yun-Taek Im; Jee-Hoon Lee; Rashid Ahmad Bhatti; Seong-Ook Park A Spiral-Dipole Antenna for MIMO Systems Journal Article IEEE Antennas and Wireless Propagation Letters, 7 , pp. 803 - 806, 2008. @article{Im2008, title = {A Spiral-Dipole Antenna for MIMO Systems}, author = {Yun-Taek Im and Jee-Hoon Lee and Rashid Ahmad Bhatti and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04550723.pdf}, doi = {10.1109/LAWP.2008.2001395}, year = {2008}, date = {2008-06-27}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {7}, pages = {803 - 806}, abstract = {A new circular polarization spiral-dipole antenna has been proposed for multilple-input-multiple-output (MIMO) systems. A dipole antenna is loaded with spirals at both of its ends to generate omnidirectional left-hand or right-hand circular polarization. The sense of polarization [left-hand circular polarization (LHCP) or right-hand circular polarization (RHCP)] depends on the orientation of the spirals. The measured bandwidth of the antenna is 8% at the center frequency of 5.2 GHz with 3.6-dBic gain. The isolation (S21) between collocated LHCP and RHCP antennas is better than 30 dB that makes them suitable for MIMO.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A new circular polarization spiral-dipole antenna has been proposed for multilple-input-multiple-output (MIMO) systems. A dipole antenna is loaded with spirals at both of its ends to generate omnidirectional left-hand or right-hand circular polarization. The sense of polarization [left-hand circular polarization (LHCP) or right-hand circular polarization (RHCP)] depends on the orientation of the spirals. The measured bandwidth of the antenna is 8% at the center frequency of 5.2 GHz with 3.6-dBic gain. The isolation (S21) between collocated LHCP and RHCP antennas is better than 30 dB that makes them suitable for MIMO. |
68. | Ki-Bok Kong; Jong-Sung Kim; Seong-Ook Park Reduced splitting error in the ADI‐FDTD method using iterative method Journal Article Microwave and Optical Technology Letters, 50 , pp. 2200 - 2203, 2008. @article{Kong2008b, title = {Reduced splitting error in the ADI‐FDTD method using iterative method}, author = {Ki-Bok Kong and Jong-Sung Kim and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Kong_et_al-2008-Microwave_and_Optical_Technology_Letters.pdf}, doi = {10.1002/mop.23618}, year = {2008}, date = {2008-05-28}, journal = {Microwave and Optical Technology Letters}, volume = {50}, pages = {2200 - 2203}, abstract = {In this study, a new method is introduced to reduce the splitting error in the ADI‐FDTD method using iterative method. The proposed method includes two procedures. First we solve the procedure of ADI‐FDTD method and secondly a new iterative scheme is adopted. The improvement of reduced splitting error is investigated by numerical examples.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this study, a new method is introduced to reduce the splitting error in the ADI‐FDTD method using iterative method. The proposed method includes two procedures. First we solve the procedure of ADI‐FDTD method and secondly a new iterative scheme is adopted. The improvement of reduced splitting error is investigated by numerical examples. |
67. | Viet-Anh Nguyen; Rashid Ahmad Bhatti; Seong-Ook Park A Simple PIFA-Based Tunable Internal Antenna for Personal Communication Journal Article IEEE Antennas and Wireless Propagation Letters, 7 , pp. 130 - 133, 2008. @article{Nguyen2008b, title = {A Simple PIFA-Based Tunable Internal Antenna for Personal Communication }, author = {Viet-Anh Nguyen and Rashid Ahmad Bhatti and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04473356.pdf}, doi = {10.1109/LAWP.2008.921332}, year = {2008}, date = {2008-05-20}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {7}, pages = {130 - 133}, abstract = {A simple planar inverted F antenna (PIFA)-based tunable internal antenna is proposed for personal communication handset applications. The antenna can covers following frequency bands: DCS (1710-1880 MHz), PCS (1880-1990 MHz), UMTS (1900-2170 MHz), WiBro (2300-2390 MHz), WLAN (5.2 and 5.8 GHz), Bluetooth (2400-2480 MHz), and ISM band (2500-2700 MHz). Varactor diode is used to get tuning over the wide frequency range. Overall size of the antenna is 19.5 mm times 9.5 mm times 4 mm (0.741 cm3) makes it suitable for 4 G handsets and can be easily integrated inside commercial mobile handsets. The antenna was designed and optimized by using CST microwave studio program. Measured return losses (S11) and radiation patterns of the antenna were carried on Anritsu 37377C vector network analyzer and in standard anechoic chamber room. Return loss of the antenna is within acceptable limit with reasonable radiation performance.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A simple planar inverted F antenna (PIFA)-based tunable internal antenna is proposed for personal communication handset applications. The antenna can covers following frequency bands: DCS (1710-1880 MHz), PCS (1880-1990 MHz), UMTS (1900-2170 MHz), WiBro (2300-2390 MHz), WLAN (5.2 and 5.8 GHz), Bluetooth (2400-2480 MHz), and ISM band (2500-2700 MHz). Varactor diode is used to get tuning over the wide frequency range. Overall size of the antenna is 19.5 mm times 9.5 mm times 4 mm (0.741 cm3) makes it suitable for 4 G handsets and can be easily integrated inside commercial mobile handsets. The antenna was designed and optimized by using CST microwave studio program. Measured return losses (S11) and radiation patterns of the antenna were carried on Anritsu 37377C vector network analyzer and in standard anechoic chamber room. Return loss of the antenna is within acceptable limit with reasonable radiation performance. |
66. | Ki-Bok Kong; Jong-Sung Kim; Seong-Ook Park ADI-FDTD Method Perturbed by the Second Order Cross Derivative Journal Article Microwave and Optical Technology Letters, 50 , pp. 1822 - 1826, 2008. @article{Kong2008c, title = {ADI-FDTD Method Perturbed by the Second Order Cross Derivative }, author = {Ki-Bok Kong and Jong-Sung Kim and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/adifdtd.pdf}, doi = {10.1002/mop.23479}, year = {2008}, date = {2008-04-23}, journal = {Microwave and Optical Technology Letters}, volume = {50}, pages = {1822 - 1826}, abstract = {A two‐step FDTD method as a compromise of conditional stability and reduced splitting error is formulated and its numerical stability is investigated. It is the perturbed form to the ADI‐FDTD method by the addition of second order cross derivative term. It is validated from the comparison of numerical anisotropy and numerical error over the ADI‐FDTD that numerical performances can be improved by controlling the perturbed term within the stable region of the cross derivative term.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A two‐step FDTD method as a compromise of conditional stability and reduced splitting error is formulated and its numerical stability is investigated. It is the perturbed form to the ADI‐FDTD method by the addition of second order cross derivative term. It is validated from the comparison of numerical anisotropy and numerical error over the ADI‐FDTD that numerical performances can be improved by controlling the perturbed term within the stable region of the cross derivative term. |
65. | Sung-Ho Chae; Hyeong-Sik Yoon; Seong-Ook Park The Realization And Analysis Of Pattern/Polarization Diversity In Multiple Input Multiple Output Array Journal Article Microwave and Optical Technology Letters, 50 , pp. 561 - 566, 2008. @article{Chae2008, title = {The Realization And Analysis Of Pattern/Polarization Diversity In Multiple Input Multiple Output Array}, author = {Sung-Ho Chae and Hyeong-Sik Yoon and Seong-Ook Park}, doi = {10.1002/mop.23142}, year = {2008}, date = {2008-03-01}, journal = {Microwave and Optical Technology Letters}, volume = {50}, pages = {561 - 566}, abstract = {This article proposes the pattern/polarization diversity array for multiple input multiple output applications by applying vertical and horizontal excitation. We show that pattern and polarization of antenna are changed due to vertical feeding. Then, we attempt to realize the two antenna diversity array by using different feeding method. As a result, the correlation factors with respect to the pattern and polarization diversity are investigated. Finally, the analysis of the diversity system in the view point of capacity is presented.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This article proposes the pattern/polarization diversity array for multiple input multiple output applications by applying vertical and horizontal excitation. We show that pattern and polarization of antenna are changed due to vertical feeding. Then, we attempt to realize the two antenna diversity array by using different feeding method. As a result, the correlation factors with respect to the pattern and polarization diversity are investigated. Finally, the analysis of the diversity system in the view point of capacity is presented. |
64. | Ki-Bok Kong; Jong-Sung Kim; Seong-Ook Park Reduction Of Numerical Dispersion By Optimizing Second-order Cross Product Derivative Term In The ADI-FDTD Method Journal Article Microwave and Optical Technology Letters, 50 , pp. 123 - 127, 2008. @article{Kong2008d, title = {Reduction Of Numerical Dispersion By Optimizing Second-order Cross Product Derivative Term In The ADI-FDTD Method}, author = {Ki-Bok Kong and Jong-Sung Kim and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/22991.pdf}, doi = {10.1002/mop.22991}, year = {2008}, date = {2008-01-01}, journal = {Microwave and Optical Technology Letters}, volume = {50}, pages = {123 - 127}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
2007 |
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63. | Rashid Ahmad Bhatti; Seong-Ook Park Hepta Band Internal Antenna for Personal Communication Handsets Journal Article IEEE Transactions on Antennas and Propagation, 55 , pp. 3398 - 3403, 2007. @article{Bhatti2007, title = {Hepta Band Internal Antenna for Personal Communication Handsets}, author = {Rashid Ahmad Bhatti and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04388097.pdf}, doi = {10.1109/TAP.2007.910351}, year = {2007}, date = {2007-12-06}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {55}, pages = {3398 - 3403}, abstract = {Modern personal communication handsets are shrinking in size and are required to operate at multiple frequency bands for enhanced functionality and performance. This poses an important challenge for antenna designers to build multiband antennas within the limited allowable space. In this paper, an internal antenna covering seven frequency bands is presented for personal communication handsets. The proposed antenna operates at GSM (880-960 MHz), DCS (1710-1880 MHz), PCS (1880-1990 MHz), UMTS (1900-2170 MHz), WiBro (2300-2390 MHz), Bluetooth (2.4-2.48 GHz), and WLAN (5.0-5.5 GHz) frequency bands. Measured input return loss of the antenna is better than dB at all the frequency bands with reasonable radiation performance. Antenna volume is 30 mm times15 mm times 4.0 mm (1.8 cm) that makes it attractive for modern multiband and multifunctional slim handsets.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Modern personal communication handsets are shrinking in size and are required to operate at multiple frequency bands for enhanced functionality and performance. This poses an important challenge for antenna designers to build multiband antennas within the limited allowable space. In this paper, an internal antenna covering seven frequency bands is presented for personal communication handsets. The proposed antenna operates at GSM (880-960 MHz), DCS (1710-1880 MHz), PCS (1880-1990 MHz), UMTS (1900-2170 MHz), WiBro (2300-2390 MHz), Bluetooth (2.4-2.48 GHz), and WLAN (5.0-5.5 GHz) frequency bands. Measured input return loss of the antenna is better than dB at all the frequency bands with reasonable radiation performance. Antenna volume is 30 mm times15 mm times 4.0 mm (1.8 cm) that makes it attractive for modern multiband and multifunctional slim handsets. |
62. | Yong-Sun Shin; Ki-Bok Kong; Seong-Ook Park A Compact Multiband PIFA With The Modified Ground Plane And Shorting Plate For Wireless Communication Applications Journal Article Microwave and Optical Technology Letters, 50 , pp. 114 - 117, 2007. @article{Shin2007, title = {A Compact Multiband PIFA With The Modified Ground Plane And Shorting Plate For Wireless Communication Applications}, author = {Yong-Sun Shin and Ki-Bok Kong and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Shin_et_al-2008-Microwave_and_Optical_Technology_Letters.pdf}, doi = {10.1002/mop.22999}, year = {2007}, date = {2007-11-19}, journal = {Microwave and Optical Technology Letters}, volume = {50}, pages = {114 - 117}, abstract = {A novel compact multiband planar inverted‐F antenna for Bluetooth, satellite digital multimedia broadcasting, wireless broadband, world interoperability for microwave access, and wireless local area network applications is presented. The proposed antenna, fed by a 50‐Ω coaxial line, occupies a compact volume of 24.3 × 8.2 × 2 mm3. The bandwidth is 19.4% (2.28–2.77 GHz) and 47.7% (4.04–6.57 GHz) at VSWR < 2.5, and the measured maximum gain is 4.95 dBi at 6.3 GHz. The commercial electromagnetic software CST Microwave Studio is used to optimize the design parameters and the simulated results are well in agreement with the experimental results reported in this article.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A novel compact multiband planar inverted‐F antenna for Bluetooth, satellite digital multimedia broadcasting, wireless broadband, world interoperability for microwave access, and wireless local area network applications is presented. The proposed antenna, fed by a 50‐Ω coaxial line, occupies a compact volume of 24.3 × 8.2 × 2 mm3. The bandwidth is 19.4% (2.28–2.77 GHz) and 47.7% (4.04–6.57 GHz) at VSWR < 2.5, and the measured maximum gain is 4.95 dBi at 6.3 GHz. The commercial electromagnetic software CST Microwave Studio is used to optimize the design parameters and the simulated results are well in agreement with the experimental results reported in this article. |
61. | Ngoc-Anh Nguyen; Rashid Ahmad Bhatti; Yun-Taek Im; Yong-Sun Shin; Seong-Ook Park A T-Shaped Wide-Slot Harmonic Suppression Antenna Journal Article IEEE Antennas and Wireless Propagation Letters, 6 , pp. 647 - 650, 2007. @article{Nguyen2007, title = {A T-Shaped Wide-Slot Harmonic Suppression Antenna}, author = {Ngoc-Anh Nguyen and Rashid Ahmad Bhatti and Yun-Taek Im and Yong-Sun Shin and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04392462.pdf}, doi = {10.1109/LAWP.2007.913332}, year = {2007}, date = {2007-11-16}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {6}, pages = {647 - 650}, abstract = {This paper proposes a T-shaped wide-slot harmonic suppression antenna at 4 GHz. Harmonic suppression is achieved by using a narrow microstrip-line-fed and a grounded T-shaped conductor line. The return losses and radiation patterns of the antenna at the fundamental and harmonic frequencies are measured and compared to those of the conventional T-shaped slot antenna. Equivalent circuit models are also presented to give physical insight into harmonic suppression mechanism.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper proposes a T-shaped wide-slot harmonic suppression antenna at 4 GHz. Harmonic suppression is achieved by using a narrow microstrip-line-fed and a grounded T-shaped conductor line. The return losses and radiation patterns of the antenna at the fundamental and harmonic frequencies are measured and compared to those of the conventional T-shaped slot antenna. Equivalent circuit models are also presented to give physical insight into harmonic suppression mechanism. |
60. | Dong-Hyuk Choi; Yun-Taek Im; Young-Jun Cho; Seong-Ook Park A Tunable Antenna for DVB-H Applications Journal Article IEEE Antennas and Wireless Propagation Letters, 6 , pp. 515 - 517, 2007. @article{Choi2007, title = {A Tunable Antenna for DVB-H Applications}, author = {Dong-Hyuk Choi and Yun-Taek Im and Young-Jun Cho and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04357957.pdf}, doi = {10.1109/LAWP.2007.908012}, year = {2007}, date = {2007-11-12}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {6}, pages = {515 - 517}, abstract = {A novel wideband built-in antenna with resonance frequency variability for digital video broadcasting-handheld (DVB-H) is proposed. The tunable antenna consists of two channel matching networks and a spiral-shaped monopole type radiator. Based on the matching networks combined with the switches, wide bandwidth and good radiation gains are obtained. As a demonstration, a wideband tunable antenna is designed and measured. The proposed antenna has an approximately omnidirectional radiation pattern and its peak gain is 3 dB greater than the required antenna gain covering DVB-H band. These features are suitable for DVB-H applications.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A novel wideband built-in antenna with resonance frequency variability for digital video broadcasting-handheld (DVB-H) is proposed. The tunable antenna consists of two channel matching networks and a spiral-shaped monopole type radiator. Based on the matching networks combined with the switches, wide bandwidth and good radiation gains are obtained. As a demonstration, a wideband tunable antenna is designed and measured. The proposed antenna has an approximately omnidirectional radiation pattern and its peak gain is 3 dB greater than the required antenna gain covering DVB-H band. These features are suitable for DVB-H applications. |
59. | Yong-Sun Shin; Seong-Ook Park A Compact Loop Type Antenna for Bluetooth, S-DMB, Wibro, WiMax, and WLAN Applications Journal Article IEEE Antennas and Wireless Propagation Letters, 6 , pp. 320 - 323, 2007. @article{Shin2007b, title = {A Compact Loop Type Antenna for Bluetooth, S-DMB, Wibro, WiMax, and WLAN Applications}, author = {Yong-Sun Shin and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04273557.pdf}, doi = {10.1109/LAWP.2007.899918}, year = {2007}, date = {2007-07-16}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {6}, pages = {320 - 323}, abstract = {This paper presents a novel compact loop type antenna for Bluetooth, satellite-digital multimedia broadcasting, wireless broadband, and wireless local-area network applications. The proposed antenna fed by a 50-Omega coaxial line occupies a compact volume of 26 times 8 times 3 mm3 . The bandwidth is 19.9% (2.26-2.76 GHz) and 45.6% (4.03-6.4 GHz) at S11< -10 dB and the measured maximum gain is 6.41 dBi at 5.35 GHz. The Microwave Studio simulation is employed for optimizing the design parameters, and the simulated results agree well agree with those of the measured one.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper presents a novel compact loop type antenna for Bluetooth, satellite-digital multimedia broadcasting, wireless broadband, and wireless local-area network applications. The proposed antenna fed by a 50-Omega coaxial line occupies a compact volume of 26 times 8 times 3 mm3 . The bandwidth is 19.9% (2.26-2.76 GHz) and 45.6% (4.03-6.4 GHz) at S11< -10 dB and the measured maximum gain is 6.41 dBi at 5.35 GHz. The Microwave Studio simulation is employed for optimizing the design parameters, and the simulated results agree well agree with those of the measured one. |
58. | Hyeong-Sik Yoon; Seong-Ook Park A New Compact Hexaband Internal Antenna of the Planar Inverted F-Type for Mobile Handsets Journal Article IEEE Antennas and Wireless Propagation Letters, 6 , pp. 336 - 339, 2007. @article{Yoon2007, title = {A New Compact Hexaband Internal Antenna of the Planar Inverted F-Type for Mobile Handsets}, author = {Hyeong-Sik Yoon and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04273563.pdf}, doi = {10.1109/LAWP.2007.900958}, year = {2007}, date = {2007-07-16}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {6}, pages = {336 - 339}, abstract = {This letter presents a novel compact internal antenna of the planar inverted F-antenna type. The proposed antenna, with the small size of 19 times 10 times5 mm3 , can be easily placed in practical handsets. The return loss and radiation patterns from the proposed antenna are presented. The measured bandwidth of the proposed antenna (S11 < -9 dB) can cover 610 MHz (1600-2210 MHz) in the lower band and 1170 MHz (4960-6130 MHz) in the upper band. These operating frequencies are very attractive features for DCS/PCS/IMT-2000/UMTS/ISM/WLAN bands handset applications. Numerical simulation and experiment results of the proposed antenna are investigated.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This letter presents a novel compact internal antenna of the planar inverted F-antenna type. The proposed antenna, with the small size of 19 times 10 times5 mm3 , can be easily placed in practical handsets. The return loss and radiation patterns from the proposed antenna are presented. The measured bandwidth of the proposed antenna (S11 < -9 dB) can cover 610 MHz (1600-2210 MHz) in the lower band and 1170 MHz (4960-6130 MHz) in the upper band. These operating frequencies are very attractive features for DCS/PCS/IMT-2000/UMTS/ISM/WLAN bands handset applications. Numerical simulation and experiment results of the proposed antenna are investigated. |
57. | Young-Bae Jung; Seong-Ook Park Dual-band and dual-polarised horn antenna including conical helix Journal Article Electronics Letters, 43 , pp. 432 - 434, 2007. @article{Jung2007, title = {Dual-band and dual-polarised horn antenna including conical helix}, author = {Young-Bae Jung and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04155582.pdf}, doi = {10.1049/el:20070418}, year = {2007}, date = {2007-04-23}, journal = {Electronics Letters}, volume = {43}, pages = {432 - 434}, abstract = {A horn antenna having dual-band and dual-polarisation operation is proposed. To implement a small-sized structure providing circular polarisations in the Ka- and K-band, the antenna is designed using the horn radiator on the basis of a conical helix which is exited by two ports for TX and RX in both ends. Through a design optimisation process, a compact dual-band and dual-polarised horn antenna having high gain and high isolation performance was realised.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A horn antenna having dual-band and dual-polarisation operation is proposed. To implement a small-sized structure providing circular polarisations in the Ka- and K-band, the antenna is designed using the horn radiator on the basis of a conical helix which is exited by two ports for TX and RX in both ends. Through a design optimisation process, a compact dual-band and dual-polarised horn antenna having high gain and high isolation performance was realised. |
56. | Sung-Ho Chae; Se-Keun Oh; Seong-Ook Park Analysis of Mutual coupling, correlations, and TARC in WiBro MIMO array antenna Journal Article IEEE Antennas and Wireless Propagation Letters, 6 , pp. 122 - 125, 2007. @article{Chae2007, title = {Analysis of Mutual coupling, correlations, and TARC in WiBro MIMO array antenna}, author = {Sung-Ho Chae and Se-Keun Oh and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04147566.pdf}, doi = {10.1109/LAWP.2007.893109}, year = {2007}, date = {2007-04-10}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {6}, pages = {122 - 125}, abstract = {This paper presents the evaluation of multiple-input-multiple-output (MIMO) arrays by analyzing the mutual coupling, correlation coefficient, and total active reflection coefficient. The meaning and analysis of the three parameters are demonstrated in this paper. We show the effect of spatial and pattern diversity on MIMO arrays. We also attempt to achieve optimization of the array antenna's allocation for wireless broadband MIMO applications by performance evaluation}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper presents the evaluation of multiple-input-multiple-output (MIMO) arrays by analyzing the mutual coupling, correlation coefficient, and total active reflection coefficient. The meaning and analysis of the three parameters are demonstrated in this paper. We show the effect of spatial and pattern diversity on MIMO arrays. We also attempt to achieve optimization of the array antenna's allocation for wireless broadband MIMO applications by performance evaluation |
55. | Se-Keun Oh; Hyung-Sik Yoon; Seong-Ook Park A PIFA-Type Varactor-Tunable Slim Antenna With a PIL Patch Feed for Multiband Applications Journal Article IEEE Antennas and Wireless Propagation Letters, 6 , pp. 103 - 105, 2007. @article{Oh2007, title = {A PIFA-Type Varactor-Tunable Slim Antenna With a PIL Patch Feed for Multiband Applications}, author = {Se-Keun Oh and Hyung-Sik Yoon and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04142736.pdf}, doi = {10.1109/LAWP.2007.893096}, year = {2007}, date = {2007-04-02}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {6}, pages = {103 - 105}, abstract = {A novel varactor-tuned compact multiband slim antenna for covering the digital cellular system (DCS; 1710-1880 MHz), personal communication service (PCS; 1850-1990 MHz), Universal Mobile Telecommunications System (UMTS; 1900-2200 MHz), WiBro (2300-2390 MHz), and wireless LAN (WLAN; 5150-5350 and 5725-5850 MHz) bands is presented. The proposed antenna consists of a main patch and a planar inverted-L (PIL) patch with a feed line for the broadband characteristic. A varactor diode is attached to the radiating element for frequency shift. This antenna occupied in a total volume of 27 mm times 11 mm times 5 mm can be easily placed in commercial mobile handsets. The computer simulation technology (CST) microwave studio is used to design and optimize the antenna. We found good agreement between the simulated and measured results}, keywords = {}, pubstate = {published}, tppubtype = {article} } A novel varactor-tuned compact multiband slim antenna for covering the digital cellular system (DCS; 1710-1880 MHz), personal communication service (PCS; 1850-1990 MHz), Universal Mobile Telecommunications System (UMTS; 1900-2200 MHz), WiBro (2300-2390 MHz), and wireless LAN (WLAN; 5150-5350 and 5725-5850 MHz) bands is presented. The proposed antenna consists of a main patch and a planar inverted-L (PIL) patch with a feed line for the broadband characteristic. A varactor diode is attached to the radiating element for frequency shift. This antenna occupied in a total volume of 27 mm times 11 mm times 5 mm can be easily placed in commercial mobile handsets. The computer simulation technology (CST) microwave studio is used to design and optimize the antenna. We found good agreement between the simulated and measured results |
54. | Yong-Sun Shin; Seong-Ook Park Spatial Diversity Antenna for WLAN application Journal Article Microwave and Optical Technology Letters, 49 , pp. 1290 - 1294, 2007. @article{Shin2007c, title = {Spatial Diversity Antenna for WLAN application}, author = {Yong-Sun Shin and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Shin_et_al-2007-Microwave_and_Optical_Technology_Letters.pdf}, doi = {10.1002/mop.22414}, year = {2007}, date = {2007-03-29}, journal = {Microwave and Optical Technology Letters}, volume = {49}, pages = {1290 - 1294}, abstract = {This article presents a novel printed diversity planar monopole antenna integrated on a PCMCIA network card with minimized the mutual coupling for WLAN application at the 5 GHz bands (5150–5350 and 5725–5875 MHz). The proposed diversity antenna is printed on FR‐4 substrate and small size enough to be embedded in the laptop computer. Optimizing the separation distance and antenna parameters with use of two slots on a ground, the good isolation performance (less than −20 dB) between the two printed monopole antennas is achieved. The proposed diversity antenna has an impedance bandwidth of 2360 MHz ranging from 4520 to 6889 MHz (S11 < −10 dB). There is a good agreement between the simulated and measured results.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This article presents a novel printed diversity planar monopole antenna integrated on a PCMCIA network card with minimized the mutual coupling for WLAN application at the 5 GHz bands (5150–5350 and 5725–5875 MHz). The proposed diversity antenna is printed on FR‐4 substrate and small size enough to be embedded in the laptop computer. Optimizing the separation distance and antenna parameters with use of two slots on a ground, the good isolation performance (less than −20 dB) between the two printed monopole antennas is achieved. The proposed diversity antenna has an impedance bandwidth of 2360 MHz ranging from 4520 to 6889 MHz (S11 < −10 dB). There is a good agreement between the simulated and measured results. |
53. | Byoung-Nam Kim; Seong-Ook Park; Yong-Sang Yoon; Jung-Keun Oh; Kyung-Joon Lee; Gwan-Young Koo Hexaband Planar Inverted-F Antenna With Novel Feed Structure for Wireless Terminals Journal Article IEEE Antennas and Wireless Propagation Letters, 6 , pp. 66 - 69, 2007. @article{Kim2007, title = {Hexaband Planar Inverted-F Antenna With Novel Feed Structure for Wireless Terminals}, author = {Byoung-Nam Kim and Seong-Ook Park and Yong-Sang Yoon and Jung-Keun Oh and Kyung-Joon Lee and Gwan-Young Koo}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04137530.pdf}, doi = {10.1109/LAWP.2007.893066}, year = {2007}, date = {2007-03-26}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {6}, pages = {66 - 69}, abstract = {This letter proposes a new wideband built-in antenna with novel feed structure for wireless terminals. With the proposed design scheme, a hexaband antenna for covering global system for mobile communication (GSM850)/GSM900/digital cellular system (DCS1800)/personal communication service (PCS1900)/wideband code division multiple access (WCDMA)/world interoperability for microwave access (WIMAX2350) for use in mobile built-in handsets is experimentally tested. This novel hexaband built-in handset antenna is developed within the limit of a 40 times 20 times 7 mm3 volume. A good agreement between measurement and simulation is achieved}, keywords = {}, pubstate = {published}, tppubtype = {article} } This letter proposes a new wideband built-in antenna with novel feed structure for wireless terminals. With the proposed design scheme, a hexaband antenna for covering global system for mobile communication (GSM850)/GSM900/digital cellular system (DCS1800)/personal communication service (PCS1900)/wideband code division multiple access (WCDMA)/world interoperability for microwave access (WIMAX2350) for use in mobile built-in handsets is experimentally tested. This novel hexaband built-in handset antenna is developed within the limit of a 40 times 20 times 7 mm3 volume. A good agreement between measurement and simulation is achieved |
2006 |
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52. | Dong-Hyuk Choi; Hyung-Sik Yoon; Seong-Ook Park Internal antenna with modified monopole type for DVB-H applications Journal Article Electronics Letters, 2006. @article{Choi2006d, title = {Internal antenna with modified monopole type for DVB-H applications}, author = {Dong-Hyuk Choi and Hyung-Sik Yoon and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/04030663.pdf}, doi = {10.1049/el:20062574}, year = {2006}, date = {2006-12-07}, journal = {Electronics Letters}, abstract = {An internal modified monopole antenna for DVB-H band is presented. By extending the feeding line of the modified monopole and locating it over a ground plane, a wideband input impedance of 328 MHz within 6:1 VSWR is achieved. The proposed antenna has an approximately omnidirectional radiation pattern and yields greater than -3 dBi antenna gain covering DVB-H band. These features are suitable for DVB-H applications}, keywords = {}, pubstate = {published}, tppubtype = {article} } An internal modified monopole antenna for DVB-H band is presented. By extending the feeding line of the modified monopole and locating it over a ground plane, a wideband input impedance of 328 MHz within 6:1 VSWR is achieved. The proposed antenna has an approximately omnidirectional radiation pattern and yields greater than -3 dBi antenna gain covering DVB-H band. These features are suitable for DVB-H applications |
51. | Nak-Seon Seong; Seong-Ook Park A Radiator Element for Active Phased Array Antenna Journal Article Microwave and Optical Technology Letters, 48 , pp. 2393 - 2395, 2006. @article{Seong2006, title = {A Radiator Element for Active Phased Array Antenna}, author = {Nak-Seon Seong and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/21971.pdf}, doi = {10.1002/mop.21971}, year = {2006}, date = {2006-09-28}, journal = {Microwave and Optical Technology Letters}, volume = {48}, pages = {2393 - 2395}, abstract = {This paper is concerned with selection and design of an antenna element of a phased array antenna for 20 GHz communications satellite. For this purpose, a new type of dual‐mode horn with inner choke ring at the excitation region is proposed. Also, measured results compared with predicted data for the dual‐mode horn radiator with a circular polarizer are presented.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper is concerned with selection and design of an antenna element of a phased array antenna for 20 GHz communications satellite. For this purpose, a new type of dual‐mode horn with inner choke ring at the excitation region is proposed. Also, measured results compared with predicted data for the dual‐mode horn radiator with a circular polarizer are presented. |
50. | Nak-Seon Seong; Seong-Ook Park A microstrip‐fed cavity‐backed circularly polarized horn antenna Journal Article Microwave and Optical Technology Letters, 48 , pp. 2454 - 2456, 2006. @article{Seong2006b, title = {A microstrip‐fed cavity‐backed circularly polarized horn antenna}, author = {Nak-Seon Seong and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/4324s.pdf}, doi = {10.1002/mop.21952}, year = {2006}, date = {2006-09-28}, journal = {Microwave and Optical Technology Letters}, volume = {48}, pages = {2454 - 2456}, abstract = {A 20 GHz 2 × 2 subarray radiator of microstrip‐fed cavity‐backed circularly polarized horn is presented. Since horn antennas incorporating waveguide types of circular polarizers have big size of radiator height, microstrip feeding and polarization is proposed and cavity‐backed introduced to improve radiation performance. Two approaches of single and 2 × 2 subarray of horn are compared to be a basic radiation element of an array antenna.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A 20 GHz 2 × 2 subarray radiator of microstrip‐fed cavity‐backed circularly polarized horn is presented. Since horn antennas incorporating waveguide types of circular polarizers have big size of radiator height, microstrip feeding and polarization is proposed and cavity‐backed introduced to improve radiation performance. Two approaches of single and 2 × 2 subarray of horn are compared to be a basic radiation element of an array antenna. |
49. | Nak-Seon Seong; Seong-Ook Park A microstrip‐fed cavity‐backed circularly polarized horn antenna Journal Article Microwave and Optical Technology Letters, 48 , pp. 2454 - 2456, 2006. @article{Seong2006bb, title = {A microstrip‐fed cavity‐backed circularly polarized horn antenna}, author = {Nak-Seon Seong and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/4324s.pdf}, doi = {10.1002/mop.21952}, year = {2006}, date = {2006-09-28}, journal = {Microwave and Optical Technology Letters}, volume = {48}, pages = {2454 - 2456}, abstract = {A 20 GHz 2 × 2 subarray radiator of microstrip‐fed cavity‐backed circularly polarized horn is presented. Since horn antennas incorporating waveguide types of circular polarizers have big size of radiator height, microstrip feeding and polarization is proposed and cavity‐backed introduced to improve radiation performance. Two approaches of single and 2 × 2 subarray of horn are compared to be a basic radiation element of an array antenna.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A 20 GHz 2 × 2 subarray radiator of microstrip‐fed cavity‐backed circularly polarized horn is presented. Since horn antennas incorporating waveguide types of circular polarizers have big size of radiator height, microstrip feeding and polarization is proposed and cavity‐backed introduced to improve radiation performance. Two approaches of single and 2 × 2 subarray of horn are compared to be a basic radiation element of an array antenna. |
48. | Kun-Mo Chu; Jung-Hwan Choi; Jung-Sub Lee; Han-Seo Cho; Seong-Ook Park; Hyo-Hoon Park; Duk-Young Jeon Optoelectronic and microwave transmission characteristics of indium solder bumps for low-temperature flip-chip applications Journal Article IEEE Transactions on Advanced Packaging, 29 , pp. 409 - 414, 2006. @article{Chu2006, title = {Optoelectronic and microwave transmission characteristics of indium solder bumps for low-temperature flip-chip applications}, author = {Kun-Mo Chu and Jung-Hwan Choi and Jung-Sub Lee and Han-Seo Cho and Seong-Ook Park and Hyo-Hoon Park and Duk-Young Jeon}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01667858.pdf}, doi = {10.1109/TADVP.2006.875417}, year = {2006}, date = {2006-08-07}, journal = {IEEE Transactions on Advanced Packaging}, volume = {29}, pages = {409 - 414}, abstract = {This paper describes low-temperature flip-chip bonding for both optical interconnect and microwave applications. Vertical-cavity surface-emitting laser (VCSEL) arrays were flip-chip bonded onto a fused silica substrate to investigate the optoelectronic characteristics. To achieve low-temperature flip-chip bonding, indium solder bumps were used, which had a low melting temperature of 156.7degC. The current-voltage (I-V) and light-current (L-I) characteristics of the flip-chip bonded VCSEL arrays were improved by Ag coating on the indium bump. The I-V and L-I curves indicate that optical and electrical performances of Ag-coated indium bumps are superior to those of uncoated indium solder bumps. The microwave characteristics of the solder bumps were investigated by using a flip-chip-bonded coplanar waveguide (CPW) structure and by measuring the scattering parameter with an on-wafer probe station for the frequency range up to 40 GHz. The indium solder bumps, either with or without the Ag coating, provided good microwave characteristics and retained the original characteristic of the CPW signal lines without degradation of the insertion and return losses by the solder bumps}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper describes low-temperature flip-chip bonding for both optical interconnect and microwave applications. Vertical-cavity surface-emitting laser (VCSEL) arrays were flip-chip bonded onto a fused silica substrate to investigate the optoelectronic characteristics. To achieve low-temperature flip-chip bonding, indium solder bumps were used, which had a low melting temperature of 156.7degC. The current-voltage (I-V) and light-current (L-I) characteristics of the flip-chip bonded VCSEL arrays were improved by Ag coating on the indium bump. The I-V and L-I curves indicate that optical and electrical performances of Ag-coated indium bumps are superior to those of uncoated indium solder bumps. The microwave characteristics of the solder bumps were investigated by using a flip-chip-bonded coplanar waveguide (CPW) structure and by measuring the scattering parameter with an on-wafer probe station for the frequency range up to 40 GHz. The indium solder bumps, either with or without the Ag coating, provided good microwave characteristics and retained the original characteristic of the CPW signal lines without degradation of the insertion and return losses by the solder bumps |
47. | Dong-Hyuk Choi; Young-Jun Cho; Seong-Ook Park A broadband slot antenna with harmonic suppression Journal Article Microwave and Optical Technology Letters, 48 , pp. 1984 - 1987, 2006. @article{Choi2006c, title = {A broadband slot antenna with harmonic suppression}, author = {Dong-Hyuk Choi and Young-Jun Cho and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/21828.pdf}, doi = {10.1002/mop.21828}, year = {2006}, date = {2006-07-24}, journal = {Microwave and Optical Technology Letters}, volume = {48}, pages = {1984 - 1987}, abstract = {In this article, a slot antenna is proposed to achieve both harmonic suppression and wide bandwidth. To obtain these results, a T‐shaped microstrip‐line‐fed slot antenna and U‐shaped conductor line connected with the ground plane are applied. At the fundamental and harmonic frequencies, return loss and radiation characteristics are measured and compared with those of the conventional slot antenna. For the proposed antenna, the 10‐dB return loss bandwidth could reach 1220 MHz (1730–2950 MHz), which is about 52% with respect to the center frequency of 2340 MHz, and it is observed that the second and third harmonics of the proposed antenna is effectively suppressed.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this article, a slot antenna is proposed to achieve both harmonic suppression and wide bandwidth. To obtain these results, a T‐shaped microstrip‐line‐fed slot antenna and U‐shaped conductor line connected with the ground plane are applied. At the fundamental and harmonic frequencies, return loss and radiation characteristics are measured and compared with those of the conventional slot antenna. For the proposed antenna, the 10‐dB return loss bandwidth could reach 1220 MHz (1730–2950 MHz), which is about 52% with respect to the center frequency of 2340 MHz, and it is observed that the second and third harmonics of the proposed antenna is effectively suppressed. |
46. | Ki-Hak Kim; Seong-Ook Park Analysis of the small band-rejected antenna with the parasitic strip for UWB Journal Article IEEE Transactions on Antennas and Propagation, 54 , pp. 1688 - 1692, 2006. @article{Kim2006, title = {Analysis of the small band-rejected antenna with the parasitic strip for UWB}, author = {Ki-Hak Kim and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01638363.pdf}, doi = {10.1109/TAP.2006.875911}, year = {2006}, date = {2006-06-05}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {54}, pages = {1688 - 1692}, abstract = {A novel band-rejected ultrawideband antenna with one parasitic strip is presented in this paper. It is designed to work on a substrate FR4 that has a thickness of 1 mm and relative permittivity of 4.6, and to operate from 3 to 17 GHz. The proposed antenna is fed by microstrip line and utilizes the parasitic strip to reject the frequency band (5.15-5.825 GHz) limited by IEEE 802.11a and HIPERLAN/2. The size of the antenna is 20/spl times/20 mm/sup 2/ and this antenna has good radiation characteristics. Effects of varying the location and length of the parasitic strip and the structure of the ground and monopole patch on the antenna performance have also been studied.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A novel band-rejected ultrawideband antenna with one parasitic strip is presented in this paper. It is designed to work on a substrate FR4 that has a thickness of 1 mm and relative permittivity of 4.6, and to operate from 3 to 17 GHz. The proposed antenna is fed by microstrip line and utilizes the parasitic strip to reject the frequency band (5.15-5.825 GHz) limited by IEEE 802.11a and HIPERLAN/2. The size of the antenna is 20/spl times/20 mm/sup 2/ and this antenna has good radiation characteristics. Effects of varying the location and length of the parasitic strip and the structure of the ground and monopole patch on the antenna performance have also been studied. |
45. | Young-Jun Cho; Ki-Hak Kim; Dong-Hyuk Choi; Seung-Sik Lee; Seong-Ook Park A miniature UWB planar monopole antenna with 5-GHz band-rejection filter and the time-domain characteristics Journal Article IEEE Transactions on Antennas and Propagation, 54 , pp. 1453 - 1460, 2006. @article{Cho2006, title = {A miniature UWB planar monopole antenna with 5-GHz band-rejection filter and the time-domain characteristics}, author = {Young-Jun Cho and Ki-Hak Kim and Dong-Hyuk Choi and Seung-Sik Lee and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01629274.pdf}, doi = {10.1109/TAP.2006.874354}, year = {2006}, date = {2006-05-08}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {54}, pages = {1453 - 1460}, abstract = {A planar monopole antenna with a staircase shape and small volume (25times26times1 mm3) is proposed in this paper. With the use of a half-bowtie radiating element, the staircase-shape, and a modified ground plane structure, the proposed antenna has a very wide impedance bandwidth measured at about 11.6 GHz (2.9-14.5 GHz, bandwidth ratio about 1:5) below VSWR 2 including the WLAN band notched in the vicinity of 5 GHz. An omnidirectional radiation pattern is obtained. The group delay which is an indication of linearity between two proposed antennas is less than 1 ns. The electrical characteristics in terms of frequency and time domains and physical ones of the proposed antenna make it attractive for use in ultrawideband (UWB) systems}, keywords = {}, pubstate = {published}, tppubtype = {article} } A planar monopole antenna with a staircase shape and small volume (25times26times1 mm3) is proposed in this paper. With the use of a half-bowtie radiating element, the staircase-shape, and a modified ground plane structure, the proposed antenna has a very wide impedance bandwidth measured at about 11.6 GHz (2.9-14.5 GHz, bandwidth ratio about 1:5) below VSWR 2 including the WLAN band notched in the vicinity of 5 GHz. An omnidirectional radiation pattern is obtained. The group delay which is an indication of linearity between two proposed antennas is less than 1 ns. The electrical characteristics in terms of frequency and time domains and physical ones of the proposed antenna make it attractive for use in ultrawideband (UWB) systems |
44. | Won-Il Kwak; Seong-Ook Park; Jong-Sung Kim A Folded Planar Inverted-F Antenna for GSM/DCS/Bluetooth Triple-Band Application Journal Article IEEE Antennas and Wireless Propagation Letters, 5 , pp. 18 - 21, 2006. @article{Kwak2006, title = {A Folded Planar Inverted-F Antenna for GSM/DCS/Bluetooth Triple-Band Application}, author = {Won-Il Kwak and Seong-Ook Park and Jong-Sung Kim}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01593613.pdf}, doi = {10.1109/LAWP.2005.863617}, year = {2006}, date = {2006-03-06}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {5}, pages = {18 - 21}, abstract = {A new internal triple-band planar inverted-F antenna (PIFA) is presented. It is implemented by printing radiating conductors over both sides of an FR4 board. The geometrical parameters and electrical performances of the antenna can be obtained by cutting embedded slots on the patch surfaces and realizing electric via holes between two layers of the patch. This antenna covers GSM (880-960 MHz), DCS (1710-1880 MHz), and Bluetooth (2400-2484 MHz) bands. Features of each band can be easily optimized by tuning the position, shape, and size of the embedded slots and via holes in the radiating patch. The experimental results of the proposed antenna are discussed and compared with simulation results from the available simulator to validate our proposed antenna design.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A new internal triple-band planar inverted-F antenna (PIFA) is presented. It is implemented by printing radiating conductors over both sides of an FR4 board. The geometrical parameters and electrical performances of the antenna can be obtained by cutting embedded slots on the patch surfaces and realizing electric via holes between two layers of the patch. This antenna covers GSM (880-960 MHz), DCS (1710-1880 MHz), and Bluetooth (2400-2484 MHz) bands. Features of each band can be easily optimized by tuning the position, shape, and size of the embedded slots and via holes in the radiating patch. The experimental results of the proposed antenna are discussed and compared with simulation results from the available simulator to validate our proposed antenna design. |
43. | Young-Jun Cho; Yong-Sun Shin; Seong-Ook Park Internal PIFA for 2.4/5 GHz WLAN applications Journal Article Electronics Letters, 42 , pp. 8 - 13, 2006. @article{Cho2006b, title = {Internal PIFA for 2.4/5 GHz WLAN applications}, author = {Young-Jun Cho and Yong-Sun Shin and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01577589.pdf}, doi = {10.1049/el:20062998}, year = {2006}, date = {2006-01-23}, journal = {Electronics Letters}, volume = {42}, pages = {8 - 13}, abstract = {An internal planar inverted-F antenna (PIFA) for 2.4 GHz Bluetooth and 5 GHz WLAN applications is presented. The proposed antenna has an impedance bandwidth of 110 MHz in Bluetooth band and 900 MHz near 5 GHz in WLAN band within 2:1 VSWR, and an approximately omnidirectional radiation pattern can be obtained. These features are suitable for 2.4/5 GHz WLAN applications.}, keywords = {}, pubstate = {published}, tppubtype = {article} } An internal planar inverted-F antenna (PIFA) for 2.4 GHz Bluetooth and 5 GHz WLAN applications is presented. The proposed antenna has an impedance bandwidth of 110 MHz in Bluetooth band and 900 MHz near 5 GHz in WLAN band within 2:1 VSWR, and an approximately omnidirectional radiation pattern can be obtained. These features are suitable for 2.4/5 GHz WLAN applications. |
2005 |
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42. | Chi-Hun Lee; Seong-Ook Park A compact printed hook‐shaped monopole antenna for 2.4/5‐GHz wlan applications Journal Article Microwave and Optical Technology Letters, 48 , pp. 327 - 329, 2005. @article{Lee2005, title = {A compact printed hook‐shaped monopole antenna for 2.4/5‐GHz wlan applications}, author = {Chi-Hun Lee and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/421ers.pdf}, doi = {10.1002/mop.21340}, year = {2005}, date = {2005-12-27}, journal = {Microwave and Optical Technology Letters}, volume = {48}, pages = {327 - 329}, abstract = {This paper proposes a compact printed hook‐shaped monopole antenna for 2.4/5‐GHz WLAN applications. The designed antenna has a compact size with dimensions 26 × 10 × 1 mm3. The impedance bandwidth (VSWR < 2) of the proposed antenna is about 170 MHz (2.32–2.49 GHz) for 2.4‐GHz (Bluetooth) bands and 4500 MHz (4.4–8.9 GHz) for the 5‐GHz (WLAN) bands. The radiation patterns are nearly omnidirectional, which is similar to typical those of monopole antenna. The maximum measured radiation gains are 1.45 dBi at 2.43 GHz and 3.37 dBi at 5.8 GHz, respectively.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper proposes a compact printed hook‐shaped monopole antenna for 2.4/5‐GHz WLAN applications. The designed antenna has a compact size with dimensions 26 × 10 × 1 mm3. The impedance bandwidth (VSWR < 2) of the proposed antenna is about 170 MHz (2.32–2.49 GHz) for 2.4‐GHz (Bluetooth) bands and 4500 MHz (4.4–8.9 GHz) for the 5‐GHz (WLAN) bands. The radiation patterns are nearly omnidirectional, which is similar to typical those of monopole antenna. The maximum measured radiation gains are 1.45 dBi at 2.43 GHz and 3.37 dBi at 5.8 GHz, respectively. |
41. | Young-Jun Cho; Soon-Ho Hwang; Seong-Ook Park A dual-band internal antenna with a parasitic patch for mobile handsets and the consideration of the handset case and battery Journal Article IEEE Antennas and Wireless Propagation Letters, 4 , pp. 429 - 432, 2005. @article{Cho2005, title = {A dual-band internal antenna with a parasitic patch for mobile handsets and the consideration of the handset case and battery}, author = {Young-Jun Cho and Soon-Ho Hwang and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01545813.pdf}, doi = {10.1109/LAWP.2005.859388}, year = {2005}, date = {2005-12-05}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {4}, pages = {429 - 432}, abstract = {This letter proposes a compact internal antenna of the modified planar inverted F antenna (PIFA) type with a parasitic patch. It also considers the influences of the handset case and battery. A low-profile design is implemented on both the top and bottom sides of the FR-4 substrate. The proposed antenna, with the small size of 27.5/spl times/12/spl times/7 mm/sup 3/, can be easily placed in the actual handset. The measured bandwidths of the proposed antenna with handset case and battery ( VSWR<2 ) can cover 140 MHz (1740-1880 MHz) in the Korean personal communication service (KPCS) band and 90 MHz (2400-2490 MHz) in the Bluetooth band. Numerical simulation and experiment results of antenna electrical performance are investigated by considering the antenna, the phone case, and the battery.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This letter proposes a compact internal antenna of the modified planar inverted F antenna (PIFA) type with a parasitic patch. It also considers the influences of the handset case and battery. A low-profile design is implemented on both the top and bottom sides of the FR-4 substrate. The proposed antenna, with the small size of 27.5/spl times/12/spl times/7 mm/sup 3/, can be easily placed in the actual handset. The measured bandwidths of the proposed antenna with handset case and battery ( VSWR<2 ) can cover 140 MHz (1740-1880 MHz) in the Korean personal communication service (KPCS) band and 90 MHz (2400-2490 MHz) in the Bluetooth band. Numerical simulation and experiment results of antenna electrical performance are investigated by considering the antenna, the phone case, and the battery. |