2005 |
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| 40. | Young-Jun Cho; Yong-Sun Shin; Soon-Ho Hwang; Seong-Ook Park A wideband internal antenna with dual monopole radiation elements Journal Article IEEE Antennas and Wireless Propagation Letters, 4 , pp. 381 - 384, 2005. @article{Cho2005b, title = {A wideband internal antenna with dual monopole radiation elements}, author = {Young-Jun Cho and Yong-Sun Shin and Soon-Ho Hwang and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01532169.pdf}, doi = {10.1109/LAWP.2005.857969}, year = {2005}, date = {2005-11-14}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {4}, pages = {381 - 384}, abstract = {This letter suggests a novel miniature wideband internal antenna with dual monopole radiation elements for operating at multiband handset applications. It consists of two radiation monopole elements with parallel connection in the limited handset interior space. The proposed antenna can be easily placed in practical handsets because of the small size of 20/spl times/17/spl times/3.5 mm/sup 3/. The measured bandwidth of the proposed antenna shows about 1 GHz from 1.71 (DCS band) to 2.71 GHz (Bluetooth band) with VSWR below 2. It also resonates at global position system (GPS) band of 1.57542 GHz. The electrical and structural characteristics of the proposed antenna make it attractive for use in mobile handset applications.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This letter suggests a novel miniature wideband internal antenna with dual monopole radiation elements for operating at multiband handset applications. It consists of two radiation monopole elements with parallel connection in the limited handset interior space. The proposed antenna can be easily placed in practical handsets because of the small size of 20/spl times/17/spl times/3.5 mm/sup 3/. The measured bandwidth of the proposed antenna shows about 1 GHz from 1.71 (DCS band) to 2.71 GHz (Bluetooth band) with VSWR below 2. It also resonates at global position system (GPS) band of 1.57542 GHz. The electrical and structural characteristics of the proposed antenna make it attractive for use in mobile handset applications. |
| 39. | Dong-Uk Sim; Seong-Ook Park A triple-band internal antenna: design and performance in presence of the handset case, battery, and human head Journal Article IEEE Transactions on Electromagnetic Compatibility, 47 , pp. 658 - 666, 2005. @article{Sim2005, title = {A triple-band internal antenna: design and performance in presence of the handset case, battery, and human head}, author = {Dong-Uk Sim and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01516238.pdf}, doi = {10.1109/TEMC.2005.850695}, year = {2005}, date = {2005-10-10}, journal = {IEEE Transactions on Electromagnetic Compatibility}, volume = {47}, pages = {658 - 666}, abstract = {An internal triple-band antenna fed by a microstrip line is proposed for operating at PCS, IMT-2000, and Bluetooth bands. As a starting point, a two-branch meander-line antenna is used to achieve the desired resonant frequency. A broadband characteristic for each band can be optimized by tuning the parts of radiating meander lines and size of each strip line segment. Considering normal use situation, the initially designed structure of the proposed antenna is extended and modified to tune the desired frequency bandwidth on the placement of handset case and battery, and in the presence of the head. Detailed model of the handset case is implemented to check the effects of the phone case and battery on the antenna performance. The return loss and radiation patterns from the proposed antenna built in a phone case in the presence of the phantom head are presented. It is found that the battery and human head have a strong influence on the antenna input impedance, radiation patterns, and gain for the internal antenna configurations. The computational values are presented to validate the experimental results.}, keywords = {}, pubstate = {published}, tppubtype = {article} } An internal triple-band antenna fed by a microstrip line is proposed for operating at PCS, IMT-2000, and Bluetooth bands. As a starting point, a two-branch meander-line antenna is used to achieve the desired resonant frequency. A broadband characteristic for each band can be optimized by tuning the parts of radiating meander lines and size of each strip line segment. Considering normal use situation, the initially designed structure of the proposed antenna is extended and modified to tune the desired frequency bandwidth on the placement of handset case and battery, and in the presence of the head. Detailed model of the handset case is implemented to check the effects of the phone case and battery on the antenna performance. The return loss and radiation patterns from the proposed antenna built in a phone case in the presence of the phantom head are presented. It is found that the battery and human head have a strong influence on the antenna input impedance, radiation patterns, and gain for the internal antenna configurations. The computational values are presented to validate the experimental results. |
| 38. | Ki-Hak Kim; Jin-U Kim; Seong-Ook Park An ultrawide-band double discone antenna with the tapered cylindrical wires Journal Article IEEE Transactions on Antennas and Propagation, 53 , 2005. @article{Kim2005, title = {An ultrawide-band double discone antenna with the tapered cylindrical wires}, author = {Ki-Hak Kim and Jin-U Kim and Seong-Ook Park }, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01514601.pdf}, doi = {10.1109/TAP.2005.856036}, year = {2005}, date = {2005-10-03}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {53}, abstract = {A novel double discone antenna is composed of the asymmetric biconical antenna and upside-down discone antenna. The asymmetric biconical antenna has all-wire structure like octopus legs for covering at lower operating frequency, and the upside-down discone antenna has conical shape playing a role as covering at higher operating frequency. An elaborate assembly of two antenna exhibits a 1:100 impedance bandwidth (180 MHz-18 GHz) with VSWR below 2.5 while maintaining an acceptable omnidirectional radiation pattern except at about 12 GHz region. The simulated performances of the proposed antenna are verified by the measured results of the fabricated antenna. There seems to be good agreement with each other. These features make such antennas highly suitable for application to UWB system.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A novel double discone antenna is composed of the asymmetric biconical antenna and upside-down discone antenna. The asymmetric biconical antenna has all-wire structure like octopus legs for covering at lower operating frequency, and the upside-down discone antenna has conical shape playing a role as covering at higher operating frequency. An elaborate assembly of two antenna exhibits a 1:100 impedance bandwidth (180 MHz-18 GHz) with VSWR below 2.5 while maintaining an acceptable omnidirectional radiation pattern except at about 12 GHz region. The simulated performances of the proposed antenna are verified by the measured results of the fabricated antenna. There seems to be good agreement with each other. These features make such antennas highly suitable for application to UWB system. |
| 37. | Young-Jun Cho; Soon-Ho Hwang; Seong-Ook Park Printed antenna with folded non-uniform meander line for 2.4/5 GHz WLAN bands Journal Article Electronics Letters, 41 , pp. 786 - 788, 2005. @article{Cho2005c, title = {Printed antenna with folded non-uniform meander line for 2.4/5 GHz WLAN bands}, author = {Young-Jun Cho and Soon-Ho Hwang and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01468035.pdf}, doi = {10.1049/el:20051347}, year = {2005}, date = {2005-07-25}, journal = {Electronics Letters}, volume = {41}, pages = {786 - 788}, abstract = {A low profile dual-band antenna for WLAN applications is proposed. It has the folded non-uniform meander line with the impedance bandwidth of 140 MHz at the 2.4 GHz band and 1500 MHz near 5 GHz with VSWR below 2, and an omnidirectional radiation pattern is obtained.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A low profile dual-band antenna for WLAN applications is proposed. It has the folded non-uniform meander line with the impedance bandwidth of 140 MHz at the 2.4 GHz band and 1500 MHz near 5 GHz with VSWR below 2, and an omnidirectional radiation pattern is obtained. |
| 36. | Ki-Hak Kim; Young-Jun Cho; Soon-Ho Hwang; Seong-Ook Park Band-notched UWB planar monopole antenna with two parasitic patches Journal Article Electronics Letters, 41 , pp. 783 - 785, 2005. @article{Kim2005b, title = {Band-notched UWB planar monopole antenna with two parasitic patches}, author = {Ki-Hak Kim and Young-Jun Cho and Soon-Ho Hwang and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01468033.pdf}, doi = {10.1049/el:20051090}, year = {2005}, date = {2005-07-25}, journal = {Electronics Letters}, volume = {41}, pages = {783 - 785}, abstract = {A novel ultra-wideband antenna with band elimination characteristic is presented, which has omnidirectional patterns in the E-plane and impedance bandwidth of about 3-18 GHz with VSWR below 2. The proposed antenna is fed by microstrip line, and consists of the monopole type with two parasitism-patches rejecting 5.15-5.825 GHz bandlimited by IEEE 802.11a and HIPERLAN/2.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A novel ultra-wideband antenna with band elimination characteristic is presented, which has omnidirectional patterns in the E-plane and impedance bandwidth of about 3-18 GHz with VSWR below 2. The proposed antenna is fed by microstrip line, and consists of the monopole type with two parasitism-patches rejecting 5.15-5.825 GHz bandlimited by IEEE 802.11a and HIPERLAN/2. |
| 35. | Chi-Hun Lee; Seong-Ook Park A novel compact cable‐fed antenna for a GSM/DCS handset Journal Article Microwave and Optical Technology Letters, 46 , pp. 469 - 471, 2005. @article{Lee2005c, title = {A novel compact cable‐fed antenna for a GSM/DCS handset}, author = {Chi-Hun Lee and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/4szers.pdf}, doi = {10.1002/mop.21019}, year = {2005}, date = {2005-07-14}, journal = {Microwave and Optical Technology Letters}, volume = {46}, pages = {469 - 471}, abstract = {By using a branch‐line ground plane, a monopole radiator, and parasitic patches, a newly compact cable‐fed antenna is investigated in order to overcome the thickness problem of the planar in‐ verted‐F antenna (PIFA). The designed antenna has dimensions of only 40 × 12 × 1 mm and the impedance bandwidth of the proposed antenna is able to cover the GSM, DCS, and PCS bands.}, keywords = {}, pubstate = {published}, tppubtype = {article} } By using a branch‐line ground plane, a monopole radiator, and parasitic patches, a newly compact cable‐fed antenna is investigated in order to overcome the thickness problem of the planar in‐ verted‐F antenna (PIFA). The designed antenna has dimensions of only 40 × 12 × 1 mm and the impedance bandwidth of the proposed antenna is able to cover the GSM, DCS, and PCS bands. |
| 34. | Dong-Hyuk Choi; Seong-Ook Park A varactor-tuned active-integrated antenna using slot antenna Journal Article IEEE Antennas and Wireless Propagation Letters, 4 , pp. 191 - 193, 2005. @article{Choi2005, title = {A varactor-tuned active-integrated antenna using slot antenna}, author = {Dong-Hyuk Choi and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01435363.pdf}, doi = {10.1109/LAWP.2005.850799}, year = {2005}, date = {2005-06-20}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {4}, pages = {191 - 193}, abstract = {A varactor-tuned active antenna which consists of a series feedback voltage-controlled oscillator (VCO) and a well matched slot antenna is proposed. The fabricated antenna shows stable oscillation at 5.8 GHz band, and the frequency varied from 5.73 to 5.97 GHz, with less than 1.28 dB of amplitude deviation over the frequency range. Since the fabricated active antenna is a simple structure where the operating frequency can be easily tuned through the varactor diode, it may be used as an element in phase-shifterless beam scanning systems. In addition, a capacitor for dc blocking is not necessary due to isolation between the active and radiating element.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A varactor-tuned active antenna which consists of a series feedback voltage-controlled oscillator (VCO) and a well matched slot antenna is proposed. The fabricated antenna shows stable oscillation at 5.8 GHz band, and the frequency varied from 5.73 to 5.97 GHz, with less than 1.28 dB of amplitude deviation over the frequency range. Since the fabricated active antenna is a simple structure where the operating frequency can be easily tuned through the varactor diode, it may be used as an element in phase-shifterless beam scanning systems. In addition, a capacitor for dc blocking is not necessary due to isolation between the active and radiating element. |
| 33. | Yong-Sun Shin; Seong-Ook Park; Manjai Lee A broadband interior antenna of planar monopole type in handsets Journal Article IEEE Antennas and Wireless Propagation Letters, 4 , pp. 9 - 12, 2005. @article{Shin2005, title = {A broadband interior antenna of planar monopole type in handsets}, author = {Yong-Sun Shin and Seong-Ook Park and Manjai Lee}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01395840.pdf}, doi = {10.1109/LAWP.2004.841623}, year = {2005}, date = {2005-06-20}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {4}, pages = {9 - 12}, abstract = {A novel internal antenna of planar monopole type is presented for broadband applications. The proposed antenna fed by a 50-/spl Omega/ microstrip line covers the digital cordless system (DCS, 1710-1880 MHz), personal communication system (PCS, 1750-1870 MHz), and international mobile telecommunication (IMT-2000, 1885-2200 MHz) bands within S/sub 11/<-10 dB. The antenna occupies a compact volume of 20/spl times/17/spl times/4.7 mm/sup 3/ and it is suitable to be built-in within the housing of a mobile phone. The bandwidth of the proposed antenna (VSWR<2) has 740 MHz starting from 1620 to 2360 MHz. The IE3D software and microwave studio (MWS) simulation are employed for optimizing the design parameters, and the simulation results are in agreement with those of the measured one, considering each associated case of the antenna itself, phone case, and battery.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A novel internal antenna of planar monopole type is presented for broadband applications. The proposed antenna fed by a 50-/spl Omega/ microstrip line covers the digital cordless system (DCS, 1710-1880 MHz), personal communication system (PCS, 1750-1870 MHz), and international mobile telecommunication (IMT-2000, 1885-2200 MHz) bands within S/sub 11/<-10 dB. The antenna occupies a compact volume of 20/spl times/17/spl times/4.7 mm/sup 3/ and it is suitable to be built-in within the housing of a mobile phone. The bandwidth of the proposed antenna (VSWR<2) has 740 MHz starting from 1620 to 2360 MHz. The IE3D software and microwave studio (MWS) simulation are employed for optimizing the design parameters, and the simulation results are in agreement with those of the measured one, considering each associated case of the antenna itself, phone case, and battery. |
| 32. | Chi-Hun Lee; Dong-Hyuk Choi; Seong-Ook Park A novel compact and wideband shorted patch antenna Journal Article Microwave and Optical Technology Letters, 46 , pp. 4 - 6, 2005. @article{Lee2005b, title = {A novel compact and wideband shorted patch antenna}, author = {Chi-Hun Lee and Dong-Hyuk Choi and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/2312ers.pdf}, doi = {10.1002/mop.20884}, year = {2005}, date = {2005-05-18}, journal = {Microwave and Optical Technology Letters}, volume = {46}, pages = {4 - 6}, abstract = {A novel compact shorted patch antenna with the bowtie‐type patch and the dual triangle portion to obtain a large bandwidth (790–970 MHz) is presented in this paper. Using shorted patches with via holes, a size reduction of 95.7% is achieved, as compared to that of the conventional half‐wave patch antenna. Moreover, it has 10‐dB return‐loss bandwidth of 20.4% for the GSM and CDMA bands. This proposed antenna exhibits not only a compact and a thin profile, but also wideband characteristics.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A novel compact shorted patch antenna with the bowtie‐type patch and the dual triangle portion to obtain a large bandwidth (790–970 MHz) is presented in this paper. Using shorted patches with via holes, a size reduction of 95.7% is achieved, as compared to that of the conventional half‐wave patch antenna. Moreover, it has 10‐dB return‐loss bandwidth of 20.4% for the GSM and CDMA bands. This proposed antenna exhibits not only a compact and a thin profile, but also wideband characteristics. |
| 31. | Soon-Ho Hwang; Won-Il Kwak; Jung-Ick Moon; Seong-Ook Park An internal dual‐band printed antenna for CDMA/PCS handsets Journal Article Microwave and Optical Technology Letters, 45 , pp. 537 - 540, 2005. @article{Hwang2005, title = {An internal dual‐band printed antenna for CDMA/PCS handsets}, author = {Soon-Ho Hwang and Won-Il Kwak and Jung-Ick Moon and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Hwang.pdf}, doi = {10.1002/mop.20872}, year = {2005}, date = {2005-04-20}, journal = {Microwave and Optical Technology Letters}, volume = {45}, pages = {537 - 540}, abstract = {This paper presents an internal dual‐band antenna which has a planar‐type radiator and operates at the CDMA (824–894‐MHz) and PCS (1750–1870‐MHz) bands. The antenna characteristics at each band are optimized by tuning the size and length of the strip line's radiating segments. This antenna is composed of FR‐4 substrate (thickness of 1 mm), a planar‐type radiator, and 50Ω coaxial feeding cable. The maximum measured radiation gains are 0.94 and 1.89 dBi in the CDMA and PCS bands, respectively. The design of the proposed antenna and the experimental results are discussed.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper presents an internal dual‐band antenna which has a planar‐type radiator and operates at the CDMA (824–894‐MHz) and PCS (1750–1870‐MHz) bands. The antenna characteristics at each band are optimized by tuning the size and length of the strip line's radiating segments. This antenna is composed of FR‐4 substrate (thickness of 1 mm), a planar‐type radiator, and 50Ω coaxial feeding cable. The maximum measured radiation gains are 0.94 and 1.89 dBi in the CDMA and PCS bands, respectively. The design of the proposed antenna and the experimental results are discussed. |
| 30. | Dong-Hyuk Choi; Seong-Ook Park Active integrated antenna using a T‐shaped microstrip coupled‐patch antenna Journal Article Microwave and Optical Technology Letters, 44 , pp. 434 - 436, 2005. @article{Choi2005b, title = {Active integrated antenna using a T‐shaped microstrip coupled‐patch antenna}, author = {Dong-Hyuk Choi and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/232ers.pdf}, doi = {10.1002/mop.20658}, year = {2005}, date = {2005-01-20}, journal = {Microwave and Optical Technology Letters}, volume = {44}, pages = {434 - 436}, abstract = {In this paper, an active integrated antenna using a T‐shaped microstrip coupled patch antenna, which acts as DC isolation in the RF path, is proposed. The designed feedback‐antenna oscillator has stable oscillation and a clear spectrum at the frequency of 5.813 GHz, which is only a 0.2% deviation from the design frequency. The measured EIRP is 19.2 mW, and the cross‐polarization levels are at least −13 dB lower than the co‐polarization ones for all directions.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this paper, an active integrated antenna using a T‐shaped microstrip coupled patch antenna, which acts as DC isolation in the RF path, is proposed. The designed feedback‐antenna oscillator has stable oscillation and a clear spectrum at the frequency of 5.813 GHz, which is only a 0.2% deviation from the design frequency. The measured EIRP is 19.2 mW, and the cross‐polarization levels are at least −13 dB lower than the co‐polarization ones for all directions. |
2004 |
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| 29. | Soon-Ho Hwang; Jung-Ick Moon; Won-Il Kwak; Seong-Ook Park Printed compact dual band antenna for 2.4 and 5 GHz ISM band applications Journal Article Electronics Letters, 40 , pp. 1568 - 1569, 2004. @article{Hwang2004, title = {Printed compact dual band antenna for 2.4 and 5 GHz ISM band applications}, author = {Soon-Ho Hwang and Jung-Ick Moon and Won-Il Kwak and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01368434.pdf}, doi = {10.1049/el:20046579}, year = {2004}, date = {2004-12-20}, journal = {Electronics Letters}, volume = {40}, pages = {1568 - 1569}, abstract = {A printed compact dipole antenna for dual ISM band (2.44 and 5 GHz) is presented. The proposed antenna fed by using a 50 /spl Omega/ coaxial line occupies a volume of 15/spl times/40/spl times/1 mm/sup 3/ (FR-4, permittivity 4.6). The impedance bandwidth for 10 dB return loss is about 400 MHz (from 2170 to 2570 MHz) at 2.4 GHz band and over 2300 MHz (from 4690 to beyond 7000 MHz) at 5 GHz band. The measured radiation gains range from 1.20 to 1.41 dBi at 2.4 GHz band and from 2.25 to 3.44 dBi at 5 GHz band, respectively.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A printed compact dipole antenna for dual ISM band (2.44 and 5 GHz) is presented. The proposed antenna fed by using a 50 /spl Omega/ coaxial line occupies a volume of 15/spl times/40/spl times/1 mm/sup 3/ (FR-4, permittivity 4.6). The impedance bandwidth for 10 dB return loss is about 400 MHz (from 2170 to 2570 MHz) at 2.4 GHz band and over 2300 MHz (from 4690 to beyond 7000 MHz) at 5 GHz band. The measured radiation gains range from 1.20 to 1.41 dBi at 2.4 GHz band and from 2.25 to 3.44 dBi at 5 GHz band, respectively. |
| 28. | Kun-Mo Chu; Jung-Hwan Choi; Jung-Sub Lee; Han-Seo Cho; Seong-Ook Park; Hyo-Hoon Park; Duk-Young Jeon Optoelectronic and microwave characteristics of silver coated indium bumps for low temperature flip-chip applications Journal Article Electronics Letters, 40 , 2004. @article{Chu2004, title = {Optoelectronic and microwave characteristics of silver coated indium 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/2018/10/01358968.pdf}, doi = {10.1049/el:20046619}, year = {2004}, date = {2004-11-22}, journal = {Electronics Letters}, volume = {40}, abstract = {The effect of silver coating on pure indium bumps for low temperature and high speed flip-chip applications is presented with respect to optoelectronic and microwave characteristics. The current-voltage and light power-current characteristics of flip-chip bonded vertical-cavity surface-emitting laser (VCSEL) arrays are improved by coating a thin silver layer of 0.2 /spl mu/m. The flip-chip assembled coplanar waveguide packages using silver coated bumps show the insertion loss is about 3.3 dB/cm at 20 GHz and the return loss is under 13 dB.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The effect of silver coating on pure indium bumps for low temperature and high speed flip-chip applications is presented with respect to optoelectronic and microwave characteristics. The current-voltage and light power-current characteristics of flip-chip bonded vertical-cavity surface-emitting laser (VCSEL) arrays are improved by coating a thin silver layer of 0.2 /spl mu/m. The flip-chip assembled coplanar waveguide packages using silver coated bumps show the insertion loss is about 3.3 dB/cm at 20 GHz and the return loss is under 13 dB. |
| 27. | Jung-Hwan Choi; Jung-Ick Moon; Seong-Ook Park Measurement of the modulated scattering microwave fields using dual-phase lock-in amplifier Journal Article IEEE Antennas and Wireless Propagation Letters, 3 , pp. 340 - 343, 2004. @article{Choi2004, title = {Measurement of the modulated scattering microwave fields using dual-phase lock-in amplifier}, author = {Jung-Hwan Choi and Jung-Ick Moon and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01373969.pdf}, doi = {10.1109/LAWP.2004.839629}, year = {2004}, date = {2004-09-07}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {3}, pages = {340 - 343}, abstract = {A new automatic measurement architecture is proposed for the simultaneous measurement of the amplitude and phase of microwave fields with optically modulated scatterer. The modulated scattering techniques have been popularly used for rapid electric field measurement without scarifying the acceptable level of accuracy. However, the conventional system for measurement of the modulated scattering fields has an unstable measurement ability and a measurement limitation in terms of a wide band frequency range due to the imperfection of in-phase and quadrature phase operation of the coupler. In this letter, we propose an improved measurement system using two signal generators. The measurement results of the proposed system are compared with those of the conventional system to demonstrate the superior performance with the phase prediction result in the near and far-field range and to validate the performance of the proposed system.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A new automatic measurement architecture is proposed for the simultaneous measurement of the amplitude and phase of microwave fields with optically modulated scatterer. The modulated scattering techniques have been popularly used for rapid electric field measurement without scarifying the acceptable level of accuracy. However, the conventional system for measurement of the modulated scattering fields has an unstable measurement ability and a measurement limitation in terms of a wide band frequency range due to the imperfection of in-phase and quadrature phase operation of the coupler. In this letter, we propose an improved measurement system using two signal generators. The measurement results of the proposed system are compared with those of the conventional system to demonstrate the superior performance with the phase prediction result in the near and far-field range and to validate the performance of the proposed system. |
| 26. | Jung-Ick Moon; Dong-Uk Sim; Seong-Ook Park Compact PIFA for 2.4/5 GHz dual ISM-band applications Journal Article Electronics Letters, 40 , 2004. @article{Moon2004, title = {Compact PIFA for 2.4/5 GHz dual ISM-band applications}, author = {Jung-Ick Moon and Dong-Uk Sim and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01315479.pdf}, doi = {10.1049/el:20045286}, year = {2004}, date = {2004-07-19}, journal = {Electronics Letters}, volume = {40}, abstract = {A compact and novel modified planar inverted-F antenna (PIFA) for dual ISM-band application is proposed. The proposed antenna, including a small ground plane, occupies a volume of 20/spl times/23.7/spl times/0.8 mm/sup 3/ (FR-4). The impedance bandwidth with 10 dB return loss is about 150 MHz (2380-2530 MHz) for 2.4 GHz band and 1450 MHz (5130-6580 MHz) for 5 GHz band. The measured radiation patterns are approximately omnidirectional and yield a gain of 1.0 dBi at 2440 MHz and 3.98 dBi at 5600 MHz, respectively.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A compact and novel modified planar inverted-F antenna (PIFA) for dual ISM-band application is proposed. The proposed antenna, including a small ground plane, occupies a volume of 20/spl times/23.7/spl times/0.8 mm/sup 3/ (FR-4). The impedance bandwidth with 10 dB return loss is about 150 MHz (2380-2530 MHz) for 2.4 GHz band and 1450 MHz (5130-6580 MHz) for 5 GHz band. The measured radiation patterns are approximately omnidirectional and yield a gain of 1.0 dBi at 2440 MHz and 3.98 dBi at 5600 MHz, respectively. |
| 25. | Kai Li; Seong-Ook Park Electromagnetic field over the spherical Earth coated with N-layered dielectric Journal Article Radio Science, 39 , pp. 1 - 10, 2004. @article{Li2004, title = {Electromagnetic field over the spherical Earth coated with N-layered dielectric}, author = {Kai Li and Seong-Ook Park }, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Radio_Science.pdf}, doi = {10.1029/2002RS002771}, year = {2004}, date = {2004-04-01}, journal = {Radio Science}, volume = {39}, pages = {1 - 10}, abstract = {The electromagnetic field in the air generated by a dipole source over an electrically spherical Earth coated with n-layered dielectric is determined for continuous-wave excitation. The region of interest consists of the spherical dielectric Earth, coated with the dielectric layer composing a succession of n spherically bounded layer under the air. In this paper, the surface impedance at any point in the n-layered dielectric for the electromagnetic field of electric type is presented, and the formulas are derived for the electromagnetic field in the air of a vertical electric dipole. Similarly, the surface admittance for the electromagnetic field of magnetic type is presented, and the formulas are derived for the electromagnetic field of a vertical magnetic dipole. Based on the above results, using reciprocity theorem, the formulas are derived readily for the six components of the electromagnetic field generated by a horizontal electric dipole.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The electromagnetic field in the air generated by a dipole source over an electrically spherical Earth coated with n-layered dielectric is determined for continuous-wave excitation. The region of interest consists of the spherical dielectric Earth, coated with the dielectric layer composing a succession of n spherically bounded layer under the air. In this paper, the surface impedance at any point in the n-layered dielectric for the electromagnetic field of electric type is presented, and the formulas are derived for the electromagnetic field in the air of a vertical electric dipole. Similarly, the surface admittance for the electromagnetic field of magnetic type is presented, and the formulas are derived for the electromagnetic field of a vertical magnetic dipole. Based on the above results, using reciprocity theorem, the formulas are derived readily for the six components of the electromagnetic field generated by a horizontal electric dipole. |
| 24. | Yong-Sun Shin; Byoung-Nam Kim; Won-Il Kwak; Seong-Ook Park GSM/DCS/IMT-2000 triple-band built-in antenna for wireless terminals Journal Article IEEE Antennas and Wireless Propagation Letters, 3 , pp. 104 - 107, 2004. @article{Shin2004, title = {GSM/DCS/IMT-2000 triple-band built-in antenna for wireless terminals}, author = {Yong-Sun Shin and Byoung-Nam Kim and Won-Il Kwak and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01302883.pdf}, doi = {10.1109/LAWP.2004.830021}, year = {2004}, date = {2004-03-23}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {3}, pages = {104 - 107}, abstract = {The development of electrically small antennas plays an important role in the rapidly growing mobile communication market. This work presents a novel design technique for a triple-band small internal antenna which covers the GSM/DCS/IMT-2000 bands. The proposed antenna consists of double shorting posts, feed post, and dual-crossed C-slot patch radiators. A high-frequency structure simulator simulation is employed for optimizing the design parameters, and the simulation results agree with the measured data. The IE3D simulation is also used to obtain the current distribution at the resonant frequencies. The maximum gains at the frequencies 950 and 1860 MHz are measured to be about 1.58 and 1.3 dBi, respectively. These positive antenna gains and triple-bands of the proposed antenna are very attractive features for GSM/DCS/IMT-2000 bands handset applications.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The development of electrically small antennas plays an important role in the rapidly growing mobile communication market. This work presents a novel design technique for a triple-band small internal antenna which covers the GSM/DCS/IMT-2000 bands. The proposed antenna consists of double shorting posts, feed post, and dual-crossed C-slot patch radiators. A high-frequency structure simulator simulation is employed for optimizing the design parameters, and the simulation results agree with the measured data. The IE3D simulation is also used to obtain the current distribution at the resonant frequencies. The maximum gains at the frequencies 950 and 1860 MHz are measured to be about 1.58 and 1.3 dBi, respectively. These positive antenna gains and triple-bands of the proposed antenna are very attractive features for GSM/DCS/IMT-2000 bands handset applications. |
| 23. | Young-Il Cho; Dong-Hyuk Choi; Seong-Ook Park FDTD analysis of bow-tie antenna by incorporating approximated static field solutions Journal Article IEEE Antennas and Wireless Propagation Letters, 3 , pp. 176 - 179, 2004. @article{Cho2004, title = {FDTD analysis of bow-tie antenna by incorporating approximated static field solutions}, author = {Young-Il Cho and Dong-Hyuk Choi and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01324098.pdf}, doi = {10.1109/LAWP.2004.833711}, year = {2004}, date = {2004-03-23}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {3}, pages = {176 - 179}, abstract = {In this letter, finite-difference time-domain analysis of the bow-tie antenna, including a feeding point, was studied by incorporating an approximated static field solution without additional computation time. By reformulating the static field solution in the rotated coordinate system, we can easily calculate the correction factors and obtain the result that shows a remarkable agreement with the method of moments result in spite of relatively coarse meshes.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this letter, finite-difference time-domain analysis of the bow-tie antenna, including a feeding point, was studied by incorporating an approximated static field solution without additional computation time. By reformulating the static field solution in the rotated coordinate system, we can easily calculate the correction factors and obtain the result that shows a remarkable agreement with the method of moments result in spite of relatively coarse meshes. |
| 22. | Dae-Sik Yim; Seong-Ook Park Novel Wideband Internal chip Antenna for PCS/IMT-2000 Dual-Band Applications Journal Article Microwave and Optical Technology Letters, 40 (4), 2004. @article{Yim2004, title = {Novel Wideband Internal chip Antenna for PCS/IMT-2000 Dual-Band Applications}, author = {Dae-Sik Yim and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/2004_MOTL_wideband.pdf}, doi = {10.1002/mop.11369}, year = {2004}, date = {2004-02-20}, journal = {Microwave and Optical Technology Letters}, volume = {40}, number = {4}, abstract = {A novel wideband internal chip antenna for KPCS/IMT‐2000 dual‐band applications is investigated experimentally and numerically. It has a wide bandwidth of about 21.4%, measured gain of 2.6 dBi, and an omnidirectional radiation pattern while retaining cost effectiveness and small size. These features make the proposed antenna highly suitable for handset applications.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A novel wideband internal chip antenna for KPCS/IMT‐2000 dual‐band applications is investigated experimentally and numerically. It has a wide bandwidth of about 21.4%, measured gain of 2.6 dBi, and an omnidirectional radiation pattern while retaining cost effectiveness and small size. These features make the proposed antenna highly suitable for handset applications. |
| 21. | Dong-Uk Sim; Jung-Ick Moon; Seong-Ook Park A wideband monopole antenna for PCS/IMT-2000/Bluetooth applications Journal Article IEEE Antennas and Wireless Propagation Letters, 3 , pp. 45 - 47, 2004. @article{Sim2004, title = {A wideband monopole antenna for PCS/IMT-2000/Bluetooth applications}, author = {Dong-Uk Sim and Jung-Ick Moon and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01290936.pdf}, doi = {10.1109/LAWP.2004.827893}, year = {2004}, date = {2004-02-01}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {3}, pages = {45 - 47}, abstract = {A triple-band stubby antenna, fed by a coaxial probe, and a tuning technique are proposed for operating at PCS, IMT-2000, and Bluetooth bands. The proposed antenna, shielded by the antenna cover, consists of two radiating elements. The impedance matching and bandwidth for the proposed antenna are mainly affected by the length of the ground patch at the bottom of a small substrate. By properly choosing the size of the ground patch, the resonant frequencies can be easily adjusted, and a wide impedance bandwidth of 59.7% (|S/sub 11/| < -10 dB), which covers the Korean PCS (1750-1870 MHz), IMT-2000 (1920-2170 MHz), and Bluetooth (2402-2483.5 MHz) can be achieved. An omnidirectional radiation pattern is obtained, and a peak antenna gain of about 3 dBi or more is measured. The electrical characteristics of the proposed antenna make it attractive for use in mobile handset applications.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A triple-band stubby antenna, fed by a coaxial probe, and a tuning technique are proposed for operating at PCS, IMT-2000, and Bluetooth bands. The proposed antenna, shielded by the antenna cover, consists of two radiating elements. The impedance matching and bandwidth for the proposed antenna are mainly affected by the length of the ground patch at the bottom of a small substrate. By properly choosing the size of the ground patch, the resonant frequencies can be easily adjusted, and a wide impedance bandwidth of 59.7% (|S/sub 11/| < -10 dB), which covers the Korean PCS (1750-1870 MHz), IMT-2000 (1920-2170 MHz), and Bluetooth (2402-2483.5 MHz) can be achieved. An omnidirectional radiation pattern is obtained, and a peak antenna gain of about 3 dBi or more is measured. The electrical characteristics of the proposed antenna make it attractive for use in mobile handset applications. |
| 20. | Kai Li; Seong-Ook Park Electromagnetic field in the presence of a three-layered spherical region Journal Article Progress In Electromagnetics Research, 45 , pp. 103 - 121, 2004. @article{Li2004b, title = {Electromagnetic field in the presence of a three-layered spherical region}, author = {Kai Li and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/0593.pdf}, doi = {10.2528/PIER03060903 }, year = {2004}, date = {2004-01-31}, journal = {Progress In Electromagnetics Research}, volume = {45}, pages = {103 - 121}, abstract = {In this paper, the region of interest consists of the spherical dielectric earth, coated with a dielectric layer under the air. The simple explicit formulas have been derived for the electromagnetic fields of a vertical electric dipole and vertical magnetic dipole in the presence of three-layered spherical region, respectively. Next, basing on the above results, the formulas for the six components of the field in the air generated by a horizontal electric dipole are derived by using reciprocity. The computations show that the trapped surface wave of electric type can be excited efficiently and the trapped surface wave of magnetic type can not be excited when the thickness l of the dielectric layer is somewhat and satisfies the condition 0 < √(k21-k20)*l < π/2.When the thickness l of the dielectric layer is somewhat and satisfies the condition π/2 < √(k21-k20)*l < π, the trapped surface wave of magnetic type can be excited. These formulas and the computations can be applied to the surface communications at the lower frequencies.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this paper, the region of interest consists of the spherical dielectric earth, coated with a dielectric layer under the air. The simple explicit formulas have been derived for the electromagnetic fields of a vertical electric dipole and vertical magnetic dipole in the presence of three-layered spherical region, respectively. Next, basing on the above results, the formulas for the six components of the field in the air generated by a horizontal electric dipole are derived by using reciprocity. The computations show that the trapped surface wave of electric type can be excited efficiently and the trapped surface wave of magnetic type can not be excited when the thickness l of the dielectric layer is somewhat and satisfies the condition 0 < √(k21-k20)*l < π/2.When the thickness l of the dielectric layer is somewhat and satisfies the condition π/2 < √(k21-k20)*l < π, the trapped surface wave of magnetic type can be excited. These formulas and the computations can be applied to the surface communications at the lower frequencies. |
2003 |
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| 19. | Dong-Hyuk Choi; Young-Il Cho; Seong-Ook Park Mutual coupling effects between transmit and receive antennas mounted on rectangular structure using FDTD algorithm Journal Article Microwave and Optical Technology Letters, 40 , pp. 265 - 268, 2003. @article{Choi2003, title = {Mutual coupling effects between transmit and receive antennas mounted on rectangular structure using FDTD algorithm}, author = {Dong-Hyuk Choi and Young-Il Cho and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/d221rs.pdf}, doi = {10.1002/mop.11348}, year = {2003}, date = {2003-12-16}, journal = {Microwave and Optical Technology Letters}, volume = {40}, pages = {265 - 268}, abstract = {This paper presents the radiation patterns of the monopole antenna mounted on the rectangular shaped structure and the coupling problem between transmit (Tx) and receiver (Rx) antennas obtained by using the FDTD method. A comparison of FDTD calculated results with the exact solution for cylindrical structure validates the accuracy of the algorithm. Using the developed FDTD code, the power radiated from the Tx port influences the Rx port at the nearby working frequency of 2 GHz. The magnitude of coupling effects in terms of scattering parameters has the highest value of about −40 dB within the 2–3.5‐GHz frequency range.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper presents the radiation patterns of the monopole antenna mounted on the rectangular shaped structure and the coupling problem between transmit (Tx) and receiver (Rx) antennas obtained by using the FDTD method. A comparison of FDTD calculated results with the exact solution for cylindrical structure validates the accuracy of the algorithm. Using the developed FDTD code, the power radiated from the Tx port influences the Rx port at the nearby working frequency of 2 GHz. The magnitude of coupling effects in terms of scattering parameters has the highest value of about −40 dB within the 2–3.5‐GHz frequency range. |
| 18. | Dae-Sik Yim; Seong-Ook Park Small Internal Ceramic Chip Antenna for IMT-2000 Handsets Journal Article Electronics Letters, 39 , pp. 1364 - 1365, 2003, ISSN: 0013-5194. @article{Yim2003, title = {Small Internal Ceramic Chip Antenna for IMT-2000 Handsets}, author = {Dae-Sik Yim and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01244144.pdf}, doi = {10.1049/el:20030891}, issn = {0013-5194}, year = {2003}, date = {2003-11-10}, journal = {Electronics Letters}, volume = {39}, pages = {1364 - 1365}, abstract = {A small internal ceramic chip antenna for IMT-2000 handsets is investigated experimentally and numerically. It has a bandwidth of about 14%, measured gain of 1.3 dBi, and an omnidirectional radiation pattern similar to that of a monopole antenna. These features make the proposed antenna suitable for handset applications.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A small internal ceramic chip antenna for IMT-2000 handsets is investigated experimentally and numerically. It has a bandwidth of about 14%, measured gain of 1.3 dBi, and an omnidirectional radiation pattern similar to that of a monopole antenna. These features make the proposed antenna suitable for handset applications. |
| 17. | Young-Bae Kwon; Jung-Ick Moon; Seong-Ook Park An internal triple-band planar inverted-F antenna Journal Article IEEE Antennas and Wireless Propagation Letters, 2 , pp. 341 - 344, 2003. @article{Kwon2003, title = {An internal triple-band planar inverted-F antenna}, author = {Young-Bae Kwon and Jung-Ick Moon and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01268485.pdf}, doi = {10.1109/LAWP.2004.824170}, year = {2003}, date = {2003-11-06}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {2}, pages = {341 - 344}, abstract = {A novel internal triple-band planar inverted-F antenna (PIFA) for operating at Personal Communication Services/International Mobile Telecommunications (PCS/IMT)-2000/Bluetooth bands is proposed. The proposed antenna can be reduced in size by using a radiating element with thickness and a via hole. A broadband characteristic is obtained by optimizing the thickness of the radiating patch and the offset gap between patch and ground. Dual resonant frequencies are obtained by optimizing the slit lengths and the location of the via hole. The proposed antenna is well suited as an internal antenna due to its small size and wide bandwidth, of about 42%, which covers the PCS (1.75-1.87 GHz), IMT-2000 (1.92-2.17 GHz) and Bluetooth (2.402-2.48 GHz) bands. The design of the proposed antenna and experimental results are discussed.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A novel internal triple-band planar inverted-F antenna (PIFA) for operating at Personal Communication Services/International Mobile Telecommunications (PCS/IMT)-2000/Bluetooth bands is proposed. The proposed antenna can be reduced in size by using a radiating element with thickness and a via hole. A broadband characteristic is obtained by optimizing the thickness of the radiating patch and the offset gap between patch and ground. Dual resonant frequencies are obtained by optimizing the slit lengths and the location of the via hole. The proposed antenna is well suited as an internal antenna due to its small size and wide bandwidth, of about 42%, which covers the PCS (1.75-1.87 GHz), IMT-2000 (1.92-2.17 GHz) and Bluetooth (2.402-2.48 GHz) bands. The design of the proposed antenna and experimental results are discussed. |
| 16. | Kai Li; Seong-Ook Park Journal of Electromagnetic Waves and Applications, 17 , pp. 1399 - 1417, 2003. @article{Li2003, title = {Electromagnetic field in the air generated by a horizontal electric dipole located in the spherical electrically earth coated with a dielectric layer}, author = {Kai Li and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/kai2.pdf}, doi = {10.1163/156939303322519586}, year = {2003}, date = {2003-10-01}, journal = {Journal of Electromagnetic Waves and Applications}, volume = {17}, pages = {1399 - 1417}, abstract = {In this paper, the region of interest consists of the spherical dielectric earth, coated with a dielectric layer under the air. First, we will derive the formulas for the electromagnetic field in the earth of a vertical electric dipole located in the air and those of a vertical magnetic dipole, respectively. Then, the formulas for the components of the field in the air generated by a horizontal electric dipole are obtained by using the reciprocity theorem. Finally, the computations will be carried out.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this paper, the region of interest consists of the spherical dielectric earth, coated with a dielectric layer under the air. First, we will derive the formulas for the electromagnetic field in the earth of a vertical electric dipole located in the air and those of a vertical magnetic dipole, respectively. Then, the formulas for the components of the field in the air generated by a horizontal electric dipole are obtained by using the reciprocity theorem. Finally, the computations will be carried out. |
| 15. | Jung-Ick Moon; Seong-Ook Park Small chip antenna for 2.4/5.8-GHz dual ISM-band applications Journal Article IEEE Antennas and Wireless Propagation Letters, 2 , pp. 313 - 315, 2003. @article{Moon2003b, title = {Small chip antenna for 2.4/5.8-GHz dual ISM-band applications}, author = {Jung-Ick Moon and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/01267077.pdf}, doi = {10.1109/LAWP.2004.824167}, year = {2003}, date = {2003-09-25}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {2}, pages = {313 - 315}, abstract = {We propose a novel chip-type ceramic dielectric antenna using the advanced meander line technique for 2.4/5.8-GHz dual ISM-band applications. The proposed antenna is composed of small ceramic dielectric (8 mm /spl times/ 4 mm /spl times/ 1.5 mm, alumina) and substrate (thickness of 1.52 mm, TMM-4). In order to minimize the antenna's available area on the substrate and to reduce the coupling effect with the ground plane, the antenna is located at the corner of the substrate. The measured bandwidths and maximum radiation gains are 2.35-2.57 GHz, 2.07 dBi at 2.44 GHz (VSWR<2) and 5.29-6.01 GHz, 1.17 dBi at 5.75 GHz, respectively. From these results, it is demonstrated that our proposed antenna can be applicable to dual-ISM band applications.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We propose a novel chip-type ceramic dielectric antenna using the advanced meander line technique for 2.4/5.8-GHz dual ISM-band applications. The proposed antenna is composed of small ceramic dielectric (8 mm /spl times/ 4 mm /spl times/ 1.5 mm, alumina) and substrate (thickness of 1.52 mm, TMM-4). In order to minimize the antenna's available area on the substrate and to reduce the coupling effect with the ground plane, the antenna is located at the corner of the substrate. The measured bandwidths and maximum radiation gains are 2.35-2.57 GHz, 2.07 dBi at 2.44 GHz (VSWR<2) and 5.29-6.01 GHz, 1.17 dBi at 5.75 GHz, respectively. From these results, it is demonstrated that our proposed antenna can be applicable to dual-ISM band applications. |
| 14. | Jung-Ick Moon; Seong-Ook Park Small Chip Dielectric Antenna for Bluetooth Application Journal Article Microwave and Optical Technology Letter, 39 , pp. 366 - 368, 2003. @article{Moon2003, title = {Small Chip Dielectric Antenna for Bluetooth Application}, author = {Jung-Ick Moon and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/11218.pdf}, year = {2003}, date = {2003-05-03}, journal = {Microwave and Optical Technology Letter}, volume = {39}, pages = {366 - 368}, abstract = {This paper proposes the design of a small chip-type dielectric antenna using the advanced meander line technique, so that the radiation metals are formed on the bottom face of a ceramic dielectric and on both faces of the substrate (thickness 1.0 mm, FR-4). The performance of the proposed antenna mode, which remarkably reduced the size, shows good agreement between measured and computed results. The measured results show that this antenna has 11.2% bandwidth and 2.3-dBi maximum radiation gain, respectively.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper proposes the design of a small chip-type dielectric antenna using the advanced meander line technique, so that the radiation metals are formed on the bottom face of a ceramic dielectric and on both faces of the substrate (thickness 1.0 mm, FR-4). The performance of the proposed antenna mode, which remarkably reduced the size, shows good agreement between measured and computed results. The measured results show that this antenna has 11.2% bandwidth and 2.3-dBi maximum radiation gain, respectively. |
2002 |
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| 13. | Jong-Pil Lee; Seong-Ook Park The meander line antenna for bluetooth Journal Article Microwave and Optical Technology Letters, 34 , pp. 149 - 151, 2002. @article{Lee2002, title = {The meander line antenna for bluetooth}, author = {Jong-Pil Lee and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/23rs.pdf}, doi = {10.1002/mop.10399}, year = {2002}, date = {2002-06-19}, journal = {Microwave and Optical Technology Letters}, volume = {34}, pages = {149 - 151}, abstract = {This Letter proposes a novel antenna that has a small size and high gain features. The conventional chip antennas are made of very high dielectric materials that result in small size but inherently low radiation gain. Instead of using the dielectric materials, the proposed antenna has a small size while retaining high gain. The bandwidth and gain of this model, with antenna size 15 × 10 × 6 mm, have 9.0% (at 2.44 GHz, |S11| ≤ −10 dB) and 2.73 dBi, respectively.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This Letter proposes a novel antenna that has a small size and high gain features. The conventional chip antennas are made of very high dielectric materials that result in small size but inherently low radiation gain. Instead of using the dielectric materials, the proposed antenna has a small size while retaining high gain. The bandwidth and gain of this model, with antenna size 15 × 10 × 6 mm, have 9.0% (at 2.44 GHz, |S11| ≤ −10 dB) and 2.73 dBi, respectively. |
| 12. | Jong-Pil Lee; Seong-Ook Park Bow‐tie wide‐band monopole antenna with the novel impedance‐matching technique Journal Article Microwave and Optical Technology Letters, 33 , pp. 448 - 452, 2002. @article{Lee2002b, title = {Bow‐tie wide‐band monopole antenna with the novel impedance‐matching technique}, author = {Jong-Pil Lee and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/4425rs.pdf}, doi = {10.1002/mop.10347}, year = {2002}, date = {2002-05-17}, journal = {Microwave and Optical Technology Letters}, volume = {33}, pages = {448 - 452}, abstract = {A staircase bow‐tie monopole‐type antenna that features a novel broadband technique is investigated experimentally and numerically. A bandwidth of 77.1% (VSWR ≤ 2) can be achieved, and an omnidirectional radiation pattern is obtained. The electrical characteristics of the proposed antenna make it attractive for use in multiband mobile systems.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A staircase bow‐tie monopole‐type antenna that features a novel broadband technique is investigated experimentally and numerically. A bandwidth of 77.1% (VSWR ≤ 2) can be achieved, and an omnidirectional radiation pattern is obtained. The electrical characteristics of the proposed antenna make it attractive for use in multiband mobile systems. |
2001 |
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| 11. | Chan-Byoung Chae; Jong-Pil Lee; Seong-Ook Park Analytical Asymptotic Extraction Technique for the Analysis of Bend Discontinuity Journal Article Progress In Electromagnetics Research, 33 , pp. 219 - 235, 2001. @article{Chae2001, title = {Analytical Asymptotic Extraction Technique for the Analysis of Bend Discontinuity}, author = {Chan-Byoung Chae and Jong-Pil Lee and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/12rk.pdf}, doi = {10.2528/PIER01012102}, year = {2001}, date = {2001-10-01}, journal = {Progress In Electromagnetics Research}, volume = {33}, pages = {219 - 235}, abstract = {The purpose of this paper is to use the analytical asymptotic extraction technique to analyze the bend discontinuity. We show that the derived analytical techniques significantly reduce the computational time while improving the accuracy compared to the conventional method. Especially, the advantage of the proposed method can eliminate the truncation error for evaluating the asymptotic part of impedance matrix. The proposed method has applied for solving the bend discontinuity, and verified with measurement results.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The purpose of this paper is to use the analytical asymptotic extraction technique to analyze the bend discontinuity. We show that the derived analytical techniques significantly reduce the computational time while improving the accuracy compared to the conventional method. Especially, the advantage of the proposed method can eliminate the truncation error for evaluating the asymptotic part of impedance matrix. The proposed method has applied for solving the bend discontinuity, and verified with measurement results. |
| 10. | Kai Li; Seong-Ook Park Dyadic Green's Function for an Unbounded Anisotropic Medium in Cylindrical Coordinates Journal Article Journal of Electromagnetic Waves and Applications, 15 , pp. 1667 - 1668, 2001. @article{Li2001, title = {Dyadic Green's Function for an Unbounded Anisotropic Medium in Cylindrical Coordinates}, author = {Kai Li and Seong-Ook Park }, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/dyadic.pdf}, doi = {10.1163/156939301X00166}, year = {2001}, date = {2001-10-01}, journal = {Journal of Electromagnetic Waves and Applications}, volume = {15}, pages = {1667 - 1668}, abstract = {The dyadic Green's function for an unbounded anisotropic medium is treated analytically in the Fourier domain. The Green's function, which is expressed as a triple Fourier integral, can be next reduced to a double integral by performing the integration over the longitudinal Fourier variable or the transverse Fourier variable. The singular behavior of Green's dyadic is discussed for the general anisotropic case.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The dyadic Green's function for an unbounded anisotropic medium is treated analytically in the Fourier domain. The Green's function, which is expressed as a triple Fourier integral, can be next reduced to a double integral by performing the integration over the longitudinal Fourier variable or the transverse Fourier variable. The singular behavior of Green's dyadic is discussed for the general anisotropic case. |
2000 |
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| 9. | Jung-Ick Moon; Seong-Ook Park; Ke-Young Park Broadband sleeve monopole type antenna for dual-band PCS/IMT-2000 Journal Article Electronics Letters, 36 , pp. 1829 - 1830, 2000. @article{Moon2000b, title = {Broadband sleeve monopole type antenna for dual-band PCS/IMT-2000}, author = {Jung-Ick Moon and Seong-Ook Park and Ke-Young Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/00888413.pdf}, doi = {10.1049/el:20001303}, year = {2000}, date = {2000-10-26}, journal = {Electronics Letters}, volume = {36}, pages = {1829 - 1830}, abstract = {A modified sleeve monopole type antenna that features a novel broadband technique is demonstrated experimentally and numerically. A bandwidth of 24.2%1 (|S/sub 11/|<-20 dB) can be achieved, and an omnidirectional radiation pattern is obtained. The electrical characteristics of the proposed antenna make it attractive for use in mobile handset and repeater applications.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A modified sleeve monopole type antenna that features a novel broadband technique is demonstrated experimentally and numerically. A bandwidth of 24.2%1 (|S/sub 11/|<-20 dB) can be achieved, and an omnidirectional radiation pattern is obtained. The electrical characteristics of the proposed antenna make it attractive for use in mobile handset and repeater applications. |
| 8. | Jung-Ick Moon; Seong-Ook Park Dielectric resonator antenna for dual-band PCS/IMT-2000 Journal Article Electronics Letters, 36 , pp. 1002 - 1003, 2000. @article{Moon2000, title = {Dielectric resonator antenna for dual-band PCS/IMT-2000}, author = {Jung-Ick Moon and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/00852162.pdf}, doi = {10.1049/el:20000733}, year = {2000}, date = {2000-06-08}, journal = {Electronics Letters}, volume = {36}, pages = {1002 - 1003}, abstract = {A novel broadband and small dielectric resonator antenna has been investigated experimentally and numerically. A bandwidth of 25% has been achieved, and an omni-directional radiation pattern obtained. These features make such antennas highly suitable for application to mobile handsets.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A novel broadband and small dielectric resonator antenna has been investigated experimentally and numerically. A bandwidth of 25% has been achieved, and an omni-directional radiation pattern obtained. These features make such antennas highly suitable for application to mobile handsets. |
| 7. | Seong-Ook Park An Efficient Integral Transform Technique of a Singular Wire Antenna Kernel Journal Article Journal of Electromagnetic Waves and Applications , 14 , pp. 1105 - 1113, 2000. @article{Park2000, title = {An Efficient Integral Transform Technique of a Singular Wire Antenna Kernel}, author = {Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/so2312.pdf}, doi = {10.1163/156939300X01012}, year = {2000}, date = {2000-01-01}, journal = {Journal of Electromagnetic Waves and Applications }, volume = {14}, pages = {1105 - 1113}, abstract = {This paper presents an efficient integral transform technique for evaluating the singular part of the scalar and vector potentials due to a uniform current subdipole. By performing several transformations, the original double integral 1/-Rs with a singular kernal can be represented as a finite one-dimensional integral whose integrand possesses an analytically integrable logarithmic singularity. The results of the newly driven integral are compared with those using other available numerical methods and checked the validity of the proposed method.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper presents an efficient integral transform technique for evaluating the singular part of the scalar and vector potentials due to a uniform current subdipole. By performing several transformations, the original double integral 1/-Rs with a singular kernal can be represented as a finite one-dimensional integral whose integrand possesses an analytically integrable logarithmic singularity. The results of the newly driven integral are compared with those using other available numerical methods and checked the validity of the proposed method. |
1998 |
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| 6. | Seong-Ook Park; C.A. Balanis Analytical evaluation of the asymptotic impedance matrix of asymmetric gap discontinuities Journal Article IEEE Transactions on Microwave Theory and Techniques, 46 , pp. 1132 - 1140, 1998. @article{Park1998, title = {Analytical evaluation of the asymptotic impedance matrix of asymmetric gap discontinuities}, author = {Seong-Ook Park and C.A. Balanis}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/00704956.pdf}, doi = {10.1109/22.704956}, year = {1998}, date = {1998-08-01}, journal = {IEEE Transactions on Microwave Theory and Techniques}, volume = {46}, pages = {1132 - 1140}, abstract = {New analytical formulas have been developed for evaluating the asymptotic impedance matrix of an asymmetric gap by using the integral transform method. Application of the newly derived formulas shows a dramatic improvement of the computation time for evaluating the overall impedance-matrix elements for the symmetric and asymmetric gaps while retaining the accuracy.}, keywords = {}, pubstate = {published}, tppubtype = {article} } New analytical formulas have been developed for evaluating the asymptotic impedance matrix of an asymmetric gap by using the integral transform method. Application of the newly derived formulas shows a dramatic improvement of the computation time for evaluating the overall impedance-matrix elements for the symmetric and asymmetric gaps while retaining the accuracy. |
| 5. | Seong-Ook Park; C.A. Balanis; C.R. Birtcher Analytical evaluation of the asymptotic impedance matrix of a grounded dielectric slab with roof-top functions Journal Article IEEE Transactions on Antennas and Propagation, 46 (2), pp. 251 - 259, 1998. @article{Park1998b, title = {Analytical evaluation of the asymptotic impedance matrix of a grounded dielectric slab with roof-top functions}, author = {Seong-Ook Park and C.A. Balanis and C.R. Birtcher}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/00660970.pdf}, doi = {10.1109/8.660970}, year = {1998}, date = {1998-02-01}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {46}, number = {2}, pages = {251 - 259}, abstract = {An analytical technique is derived to solve the asymptotic part of impedance matrix elements for printed circuit structures using roof-top subdomain expansions. The key to this problem is the analytical transformation from an infinite double integral to a suitable finite one-dimensional (1-D) integral. The newly developed formula is applied to the monostatic radar cross section (RCS) of a microstrip patch. Comparisons are made with measurements and conventional method of moments predictions.}, keywords = {}, pubstate = {published}, tppubtype = {article} } An analytical technique is derived to solve the asymptotic part of impedance matrix elements for printed circuit structures using roof-top subdomain expansions. The key to this problem is the analytical transformation from an infinite double integral to a suitable finite one-dimensional (1-D) integral. The newly developed formula is applied to the monostatic radar cross section (RCS) of a microstrip patch. Comparisons are made with measurements and conventional method of moments predictions. |
1997 |
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| 4. | Seong-Ook Park; C.A. Balanis Analytical technique to evaluate the asymptotic part of the impedance matrix of Sommerfeld-type integrals Journal Article IEEE Transactions on Antennas and Propagation, 45 (5), pp. 798 - 805, 1997. @article{Park1996, title = {Analytical technique to evaluate the asymptotic part of the impedance matrix of Sommerfeld-type integrals}, author = {Seong-Ook Park and C.A. Balanis}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/00575625.pdf}, doi = {10.1109/8.575625}, year = {1997}, date = {1997-05-01}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {45}, number = {5}, pages = {798 - 805}, abstract = {The propagation of electromagnetic waves in a grounded dielectric slab has numerous applications in printed antenna technology and in the analysis of microwave- and millimeter-wave integrated circuits. For the accurate analysis of microstrip dipoles and circuits based on the moment of method (MoM), a crucial step is the precise evaluation of the impedance matrix elements which contain the integration of Sommerfeld-type integrals. The integral transform method with the asymptotic extraction technique is formulated for calculating a Sommerfeld-type integral problem. This formulation allows the infinite double integral of the asymptotic part of the impedance matrix to be transformed into a finite one-dimensional (1-D) integral. This finite 1-D integral contains a spherical Legendre function and can be easily evaluated numerically after the singular part of the integral is performed analytically. It is shown that the proposed method dramatically reduces the computation time and improves the accuracy over the conventional method to evaluate the asymptotic part of impedance matrix.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The propagation of electromagnetic waves in a grounded dielectric slab has numerous applications in printed antenna technology and in the analysis of microwave- and millimeter-wave integrated circuits. For the accurate analysis of microstrip dipoles and circuits based on the moment of method (MoM), a crucial step is the precise evaluation of the impedance matrix elements which contain the integration of Sommerfeld-type integrals. The integral transform method with the asymptotic extraction technique is formulated for calculating a Sommerfeld-type integral problem. This formulation allows the infinite double integral of the asymptotic part of the impedance matrix to be transformed into a finite one-dimensional (1-D) integral. This finite 1-D integral contains a spherical Legendre function and can be easily evaluated numerically after the singular part of the integral is performed analytically. It is shown that the proposed method dramatically reduces the computation time and improves the accuracy over the conventional method to evaluate the asymptotic part of impedance matrix. |
| 3. | Seong-Ook Park; C.A. Balanis Dispersion characteristics of open microstrip lines using closed-form asymptotic extraction Journal Article IEEE Transactions on Microwave Theory and Techniques, 45 (3), pp. 458 - 460, 1997. @article{Park1997, title = {Dispersion characteristics of open microstrip lines using closed-form asymptotic extraction}, author = {Seong-Ook Park and C.A. Balanis}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/00563350.pdf}, doi = {10.1109/22.563350}, year = {1997}, date = {1997-05-01}, journal = {IEEE Transactions on Microwave Theory and Techniques}, volume = {45}, number = {3}, pages = {458 - 460}, abstract = {A full-wave spectral-domain method with an asymptotic extraction technique is formulated for multilayer microstrip lines. This formulation provides a simple closed-form representation of the asymptotic part of the impedance matrix by using Chebyshev polynomial basis functions with the square-root edge condition and the asymptotic behaviour of the Green's function. The formulation is applied to open microstrip lines. Numerical results, in the form of the effective dielectric constants, are presented for the dominant mode. It is shown that the proposed method significantly reduces the computational time and improves the accuracy over the conventional spectral-domain approach (SDA).}, keywords = {}, pubstate = {published}, tppubtype = {article} } A full-wave spectral-domain method with an asymptotic extraction technique is formulated for multilayer microstrip lines. This formulation provides a simple closed-form representation of the asymptotic part of the impedance matrix by using Chebyshev polynomial basis functions with the square-root edge condition and the asymptotic behaviour of the Green's function. The formulation is applied to open microstrip lines. Numerical results, in the form of the effective dielectric constants, are presented for the dominant mode. It is shown that the proposed method significantly reduces the computational time and improves the accuracy over the conventional spectral-domain approach (SDA). |
| 2. | Seong-Ook Park; C.A. Balanis Closed-form asymptotic extraction method for coupled microstrip lines Journal Article IEEE Microwave and Guided Wave Letters, 7 (3), pp. 84 - 86, 1997. @article{Park1996b, title = {Closed-form asymptotic extraction method for coupled microstrip lines}, author = {Seong-Ook Park and C.A. Balanis}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/00556040.pdf}, doi = {10.1109/75.556040}, year = {1997}, date = {1997-03-01}, journal = {IEEE Microwave and Guided Wave Letters}, volume = {7}, number = {3}, pages = {84 - 86}, abstract = {The effective dielectric constants of a symmetric coupled microstrip line operating in the dominant mode are solved by using a closed-form formula of the asymptotic part of the impedance matrix elements. Using this asymptotic closed-form solution, the finite upper limit for numerical integration in the evaluation of the impedance matrix elements is significantly reduced. This results in improved computational efficiency for determining the /spl epsiv//sub reff/ of a coupled microstrip line while retaining a good accuracy compared to the conventional spectral domain approach (SDA).}, keywords = {}, pubstate = {published}, tppubtype = {article} } The effective dielectric constants of a symmetric coupled microstrip line operating in the dominant mode are solved by using a closed-form formula of the asymptotic part of the impedance matrix elements. Using this asymptotic closed-form solution, the finite upper limit for numerical integration in the evaluation of the impedance matrix elements is significantly reduced. This results in improved computational efficiency for determining the /spl epsiv//sub reff/ of a coupled microstrip line while retaining a good accuracy compared to the conventional spectral domain approach (SDA). |
1995 |
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| 1. | Seong-Ook Park; C.A. Balanis Efficient kernel calculation of cylindrical antennas Journal Article IEEE Transactions on Antennas and Propagation, 43 , 1995. @article{Park1995, title = {Efficient kernel calculation of cylindrical antennas}, author = {Seong-Ook Park and C.A. Balanis }, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/00475108.pdf}, doi = {10.1109/8.475108}, year = {1995}, date = {1995-11-01}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {43}, abstract = {This paper presents a technique for evaluating analytically and without limitation the singular part of the kernel integral of cylindrical wires due to uniform current distribution. This approach uses the static Green's function expression in cylindrical coordinates. The formula of the singular part converges rapidly and illustrates its usefulness for kernel calculations without loss of accuracy.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper presents a technique for evaluating analytically and without limitation the singular part of the kernel integral of cylindrical wires due to uniform current distribution. This approach uses the static Green's function expression in cylindrical coordinates. The formula of the singular part converges rapidly and illustrates its usefulness for kernel calculations without loss of accuracy. |