2018 |
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| 262. | Rao Shahid Aziz; Tae-Wan Kim; Muhammad Tayyab Azim; Laxmikant Minz; Seong-Ook Park Antenna Gain Enhancement using Double Dielectric Layered Thin Planar Lens Conference 2018 International Symposium on Antennas and Propagation (ISAP), Korea, 2018. BibTeX | 태그: International @conference{Aziz2018b, title = {Antenna Gain Enhancement using Double Dielectric Layered Thin Planar Lens}, author = {Rao Shahid Aziz and Tae-Wan Kim and Muhammad Tayyab Azim and Laxmikant Minz and Seong-Ook Park}, year = {2018}, date = {2018-10-23}, booktitle = {2018 International Symposium on Antennas and Propagation (ISAP)}, journal = {2018 International Symposium on Antennas and Propagation (ISAP)}, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 261. | Muhammad Tayyab Azim; Junhyeong Park; Laxmikant Minz; Rao Shahid Aziz; Seong-Ook Park Single Channel Linear Rotary Joint at X-band Conference 2018 International Symposium on Antennas and Propagation (ISAP), Korea, 2018. BibTeX | 태그: International @conference{Azim2018, title = {Single Channel Linear Rotary Joint at X-band}, author = {Muhammad Tayyab Azim and Junhyeong Park and Laxmikant Minz and Rao Shahid Aziz and Seong-Ook Park}, year = {2018}, date = {2018-10-23}, booktitle = {2018 International Symposium on Antennas and Propagation (ISAP)}, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 260. | Laxmikant Minz; Hyun-Seong Kang; Muhammad Tayyab Azim; Rao Shahid Aziz; Seong-Ook Park Wide-beam Choke Horn Antenna for Small Drone Detection Conference 2018 International Symposium on Antennas and Propagation (ISAP), Korea, 2018. BibTeX | 태그: International @conference{Minz2018, title = {Wide-beam Choke Horn Antenna for Small Drone Detection}, author = {Laxmikant Minz and Hyun-Seong Kang and Muhammad Tayyab Azim and Rao Shahid Aziz and Seong-Ook Park}, year = {2018}, date = {2018-10-23}, booktitle = {2018 International Symposium on Antennas and Propagation (ISAP)}, journal = {2018 International Symposium on Antennas and Propagation (ISAP)}, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 259. | Dong-Chan Kim; Seong-Ook Park A Tapered Slot Antenna for Beamforming Application Conference International Symposium on Antennas and Propagation (ISAP 2018) , Korea, 2018. BibTeX | 태그: International @conference{Kim2018i, title = {A Tapered Slot Antenna for Beamforming Application}, author = {Dong-Chan Kim and Seong-Ook Park}, year = {2018}, date = {2018-10-23}, booktitle = {International Symposium on Antennas and Propagation (ISAP 2018) }, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 258. | Tae-Wan Kim; Seong-Ook Park Analysis of Mode Splitting Behavior for Cylindrical Ferrite Resonator Antenna Conference IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science, U.S., 2018. BibTeX | 태그: International @conference{Kim2018, title = {Analysis of Mode Splitting Behavior for Cylindrical Ferrite Resonator Antenna}, author = {Tae-Wan Kim and Seong-Ook Park}, year = {2018}, date = {2018-07-10}, booktitle = {IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science}, address = {U.S.}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 257. | Tae-Wan Kim; Jun-Sung Park; Seong-Ook Park A Theoretical Model for Resonant Frequency and Radiation Pattern on Rectangular Microstrip Patch Antenna on Liquid Crystal Substrate Journal Article IEEE Transactions on Antennas and Propagation, 66 , pp. 4533-4540, 2018. Abstract | Links | BibTeX | 태그: International @article{Kim2018b, title = {A Theoretical Model for Resonant Frequency and Radiation Pattern on Rectangular Microstrip Patch Antenna on Liquid Crystal Substrate}, author = {Tae-Wan Kim and Jun-Sung Park and Seong-Ook Park}, url = {http://143.248.148.42/wp-content/uploads/2018/10/08401523.pdf}, doi = {10.1109/TAP.2018.2851304}, year = {2018}, date = {2018-07-02}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {66}, pages = {4533-4540}, abstract = {This paper presents a theoretical model of the rectangular-shaped microstrip patch antennas on liquid crystal (LC) substrates in order to accurately derive the resonant frequencies and radiation performances. The model is based on the solution of the mode matching about an LC loaded cavity. The calculation results of the theoretical model are compared with the experiment and simulation results. The discrepancy between calculation and simulation results is merely 2.7%. In addition, a tuning mechanism of the patch antenna on the LC substrate is verified depending on the strength of a biasing voltage. The calculated results of the theoretical model indicate that the resonant frequency is shifted toward lower direction and 3-dB beamwidth of radiation pattern increases as the bias voltage increases. Although the calculated maximum directivity decreases with the increment of voltage, the realized gain increases due to the radiation efficiency of the antenna.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } This paper presents a theoretical model of the rectangular-shaped microstrip patch antennas on liquid crystal (LC) substrates in order to accurately derive the resonant frequencies and radiation performances. The model is based on the solution of the mode matching about an LC loaded cavity. The calculation results of the theoretical model are compared with the experiment and simulation results. The discrepancy between calculation and simulation results is merely 2.7%. In addition, a tuning mechanism of the patch antenna on the LC substrate is verified depending on the strength of a biasing voltage. The calculated results of the theoretical model indicate that the resonant frequency is shifted toward lower direction and 3-dB beamwidth of radiation pattern increases as the bias voltage increases. Although the calculated maximum directivity decreases with the increment of voltage, the realized gain increases due to the radiation efficiency of the antenna. |
| 256. | Tae-Wan Kim; Byeong-Yong Park; Woncheol Lee; Seong-Ook Park; Yang-Ki Hong Method for Computing Frequency Response and Radiation Pattern of Magnetized Cylindrical Ferrite Resonator Antenna Journal Article IEEE Transactions on Antennas and Propagation, 66 , pp. 4415 - 4425, 2018. Abstract | Links | BibTeX | 태그: International @article{Kim2018c, title = {Method for Computing Frequency Response and Radiation Pattern of Magnetized Cylindrical Ferrite Resonator Antenna}, author = {Tae-Wan Kim and Byeong-Yong Park and Woncheol Lee and Seong-Ook Park and Yang-Ki Hong}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/08401526.pdf}, doi = {10.1109/TAP.2018.2851359}, year = {2018}, date = {2018-07-02}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {66}, pages = {4415 - 4425}, abstract = {This paper presents a theoretical model of a cylindrical ferrite resonator (FR) antenna that predicts resonance frequencies, the frequency tuning range, and radiation patterns. The FR antenna is placed on a PEC ground plane and is excited by a coaxial probe with a dc magnetic bias field applied in the direction transverse to the ground plane. An open-boundary model to predict the resonance frequency is introduced and compared with the measured results. The all-boundary model is in good agreement with the measured results compared with the other models. The discrepancy of the proposed model is less than 3%. The HE 11δ mode-splitting behavior caused by the tensor nature of the permeability of a biased ferrite is investigated. It is shown that the frequency and polarization of the antenna are tunable. The operating frequency can be chosen in the range from 8.54 to 10.115 GHz. In addition, the linear polarization is radiated at no bias, while the circular polarization is radiated at the magnetized case. The results of the theory correspond approximately with the measured and simulated results for radiation patterns.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } This paper presents a theoretical model of a cylindrical ferrite resonator (FR) antenna that predicts resonance frequencies, the frequency tuning range, and radiation patterns. The FR antenna is placed on a PEC ground plane and is excited by a coaxial probe with a dc magnetic bias field applied in the direction transverse to the ground plane. An open-boundary model to predict the resonance frequency is introduced and compared with the measured results. The all-boundary model is in good agreement with the measured results compared with the other models. The discrepancy of the proposed model is less than 3%. The HE 11δ mode-splitting behavior caused by the tensor nature of the permeability of a biased ferrite is investigated. It is shown that the frequency and polarization of the antenna are tunable. The operating frequency can be chosen in the range from 8.54 to 10.115 GHz. In addition, the linear polarization is radiated at no bias, while the circular polarization is radiated at the magnetized case. The results of the theory correspond approximately with the measured and simulated results for radiation patterns. |
| 255. | Dong-Uk Sim; Sang-Il Kwak; Jong-Hwa Kwon; Seong-Ook Park Development and Validation of New Reverberation Chamber for Wireless Devices Journal Article Wireless Communications and Mobile Computing, pp. 12, 2018. Abstract | Links | BibTeX | 태그: International @article{Sim2018, title = {Development and Validation of New Reverberation Chamber for Wireless Devices}, author = {Dong-Uk Sim and Sang-Il Kwak and Jong-Hwa Kwon and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/7068601.pdf}, year = {2018}, date = {2018-06-26}, journal = {Wireless Communications and Mobile Computing}, pages = {12}, abstract = {This paper proposes a reverberation chamber structure consisting of new reflectors and mode stirrers for electromagnetic compatibility and wireless terminal measurements. The key design considerations for them are determined through a reasonable approach to analyze the eigenmode for a reverberation chamber and the standard deviation of its working volume based on 3D simulation. The final designs are expected to improve the standard deviation performance of the initial structure of the reverberation chamber and provide a better mode stirring environment. The results measured in the fabricated chamber demonstrate that these predictions are clearly realized. The results satisfy the main requirements of this paper, which are defined in consideration of the specifications of commercial reverberation chamber products. Therefore, the reverberation chamber of this paper is expected to be useful for performance measurement and evaluation of commercial wireless terminals. To verify this logical approach to obtain a good design and its results, the results measured in the actual fabricated reverberation chamber are described along with analytical and computational results.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } This paper proposes a reverberation chamber structure consisting of new reflectors and mode stirrers for electromagnetic compatibility and wireless terminal measurements. The key design considerations for them are determined through a reasonable approach to analyze the eigenmode for a reverberation chamber and the standard deviation of its working volume based on 3D simulation. The final designs are expected to improve the standard deviation performance of the initial structure of the reverberation chamber and provide a better mode stirring environment. The results measured in the fabricated chamber demonstrate that these predictions are clearly realized. The results satisfy the main requirements of this paper, which are defined in consideration of the specifications of commercial reverberation chamber products. Therefore, the reverberation chamber of this paper is expected to be useful for performance measurement and evaluation of commercial wireless terminals. To verify this logical approach to obtain a good design and its results, the results measured in the actual fabricated reverberation chamber are described along with analytical and computational results. |
| 254. | Dae-Hwan Jung; Seong-Ook Park Experimental Demonstration of Ku-band FMCW Automobilebased SAR in Stripmap Mode Conference European Conference on Synthetic Aperture Radar, Germany, 2018. BibTeX | 태그: International @conference{Jung2018, title = {Experimental Demonstration of Ku-band FMCW Automobilebased SAR in Stripmap Mode}, author = {Dae-Hwan Jung and Seong-Ook Park}, year = {2018}, date = {2018-06-06}, booktitle = {European Conference on Synthetic Aperture Radar}, address = {Germany}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 253. | Sungwoong Choi; Sangbong Jeon; Dongho Kim; Seong-Ook Park Method to reduce an unwanted EM field component in a 4-port TEM cell Journal Article Electronics Letters, 54 , pp. 488 - 490, 2018. Abstract | Links | BibTeX | 태그: International @article{Choi2018, title = {Method to reduce an unwanted EM field component in a 4-port TEM cell}, author = {Sungwoong Choi and Sangbong Jeon and Dongho Kim and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/08345093.pdf}, doi = {10.1049/el.2017.4831}, year = {2018}, date = {2018-04-30}, journal = {Electronics Letters}, volume = {54}, pages = {488 - 490}, abstract = {As an alternative standard electromagnetic (EM) field generator, a 4-port TEM (transverse EM) cell can be used for an EM compatibility (EMC) emission and immunity test. However, unwanted EM fields generated in a TEM cell deteriorate the results and accuracy of critical EMC tests. A new method to suppress unwanted field components in a 4-port TEM cell is proposed. To reduce the unwanted EM field, the narrow slits in internal septa are inserted, which are transverse with respect to the direction of wave propagation. By introducing the slits, the 4-port TEM cell can provide improved standard EM field distribution with the much-lowered unwanted field component inside the usable test volume.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } As an alternative standard electromagnetic (EM) field generator, a 4-port TEM (transverse EM) cell can be used for an EM compatibility (EMC) emission and immunity test. However, unwanted EM fields generated in a TEM cell deteriorate the results and accuracy of critical EMC tests. A new method to suppress unwanted field components in a 4-port TEM cell is proposed. To reduce the unwanted EM field, the narrow slits in internal septa are inserted, which are transverse with respect to the direction of wave propagation. By introducing the slits, the 4-port TEM cell can provide improved standard EM field distribution with the much-lowered unwanted field component inside the usable test volume. |
| 252. | Rao Shahid Aziz; Myung-Hun Jeong; Seong-Ook Park Low‐profile full‐metal‐rimmed antenna with less nonground portion for smartphones Journal Article Microwave and Optical Technology Letters, 60 , pp. 1187 - 1193, 2018. Abstract | Links | BibTeX | 태그: International @article{Aziz2018, title = {Low‐profile full‐metal‐rimmed antenna with less nonground portion for smartphones}, author = {Rao Shahid Aziz and Myung-Hun Jeong and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/rao1233s.pdf}, doi = {10.1002/mop.31121}, year = {2018}, date = {2018-04-08}, journal = {Microwave and Optical Technology Letters}, volume = {60}, pages = {1187 - 1193}, abstract = {In this article, a low‐profile full‐metal‐rimmed antenna with less nonground portion for smartphones is presented. The proposed antenna with full‐metal rim is designed on FR4 substrate within the volume of 115 × 60 × 5 mm3. Metal rim is made up of FR4 substrate with interconnected conducting vias which surrounds inner system circuit board. The gap between metal rim and system ground plane is 1.5 mm and they are connected by a single ground patch. Moreover, folded monopole branches are implemented on circuit board to obtain wide bandwidth and improve impedance matching at higher bands. Therefore, proposed antenna contains a system circuit board with monopole branches and a full metal rim which serves GSM (850), DCS (1800), PCS (1900), UMTS (2100), LTE (2300/2500), WiBro (2350), ISM (2400), SDM‐B (2650), and W‐LAN system operating bands. The proposed antenna also has an attractive feature of utilizing very less portion of ground clearance about 4 × 38 mm2 for placing monopole antenna and still covering a wide range of operating bands. This biggest merit makes it a potential candidate for metal rimmed smartphone applications with lesser nonground portion. A sample proposed structure has been realized on FR4 substrate to prove the design concept.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } In this article, a low‐profile full‐metal‐rimmed antenna with less nonground portion for smartphones is presented. The proposed antenna with full‐metal rim is designed on FR4 substrate within the volume of 115 × 60 × 5 mm3. Metal rim is made up of FR4 substrate with interconnected conducting vias which surrounds inner system circuit board. The gap between metal rim and system ground plane is 1.5 mm and they are connected by a single ground patch. Moreover, folded monopole branches are implemented on circuit board to obtain wide bandwidth and improve impedance matching at higher bands. Therefore, proposed antenna contains a system circuit board with monopole branches and a full metal rim which serves GSM (850), DCS (1800), PCS (1900), UMTS (2100), LTE (2300/2500), WiBro (2350), ISM (2400), SDM‐B (2650), and W‐LAN system operating bands. The proposed antenna also has an attractive feature of utilizing very less portion of ground clearance about 4 × 38 mm2 for placing monopole antenna and still covering a wide range of operating bands. This biggest merit makes it a potential candidate for metal rimmed smartphone applications with lesser nonground portion. A sample proposed structure has been realized on FR4 substrate to prove the design concept. |
| 251. | Woncheol Lee; Yang-Ki Hong; Minyeong Choi; Hoyun Won; Jaejin Lee; Seong-Ook Park; Seok Bae; Hwan-Sik Yoon Ferrite-Cored Patch Antenna With Suppressed Harmonic Radiation Journal Article IEEE Transactions on Antennas and Propagation, 66 , pp. 3154 - 3159, 2018. Abstract | Links | BibTeX | 태그: International @article{Lee2018, title = {Ferrite-Cored Patch Antenna With Suppressed Harmonic Radiation}, author = {Woncheol Lee and Yang-Ki Hong and Minyeong Choi and Hoyun Won and Jaejin Lee and Seong-Ook Park and Seok Bae and Hwan-Sik Yoon}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/08318672.pdf}, doi = {10.1109/TAP.2018.2816778}, year = {2018}, date = {2018-03-16}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {66}, pages = {3154 - 3159}, abstract = {We designed and fabricated a multiple-ferrite-cored patch antenna (MFC-PA) to suppress harmonic radiation over the frequency range of 1-10 GHz and obtain wide suppressing bandwidth. Its suppression performance was compared to those of the conventional PA, photonic bandgap PA (PBG-PA), and defected ground structure PA (DGS-PA). Simulated and measured results show that MFC-PA effectively suppresses harmonic radiation up to 5.6 f0, where f0 is 0.9 GHz, while the harmonic radiation of PBG-PA and DGS-PA is suppressed up to 3 f0. It is suggested by the antenna performance simulation that MFC-PA can further suppress harmonic radiation up to 11 f0. In principle, the harmonic radiation of MFC-PA is suppressed by dissipating the unwanted signals in ferrite materials, whereas PBG-PA and DGS-PA suppress harmonic radiation by reflecting or redirecting unwanted signals, which is not desired. Ferrite loading is a unique approach to suppress any harmonic radiation.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } We designed and fabricated a multiple-ferrite-cored patch antenna (MFC-PA) to suppress harmonic radiation over the frequency range of 1-10 GHz and obtain wide suppressing bandwidth. Its suppression performance was compared to those of the conventional PA, photonic bandgap PA (PBG-PA), and defected ground structure PA (DGS-PA). Simulated and measured results show that MFC-PA effectively suppresses harmonic radiation up to 5.6 f0, where f0 is 0.9 GHz, while the harmonic radiation of PBG-PA and DGS-PA is suppressed up to 3 f0. It is suggested by the antenna performance simulation that MFC-PA can further suppress harmonic radiation up to 11 f0. In principle, the harmonic radiation of MFC-PA is suppressed by dissipating the unwanted signals in ferrite materials, whereas PBG-PA and DGS-PA suppress harmonic radiation by reflecting or redirecting unwanted signals, which is not desired. Ferrite loading is a unique approach to suppress any harmonic radiation. |
| 250. | Tae-Wan Kim; Chan-Yong Jung; Seong-Ook Park Microwave Measurement of Initial Properties of Ferrites Using Mode Splitting Phenomenon by the Rod Resonator Method Journal Article Journal of Electromagnetic Waves and Applications, 32 , pp. 1306 - 1315, 2018. Abstract | Links | BibTeX | 태그: International @article{Kim2018e, title = {Microwave Measurement of Initial Properties of Ferrites Using Mode Splitting Phenomenon by the Rod Resonator Method}, author = {Tae-Wan Kim and Chan-Yong Jung and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/mmip.pdf}, doi = {10.1080/09205071.2018.1434017}, year = {2018}, date = {2018-02-02}, journal = {Journal of Electromagnetic Waves and Applications}, volume = {32}, pages = {1306 - 1315}, abstract = {This paper proposes an accurate method to calculate the permittivity and permeability of ferrites simultaneously at the demagnetized state. The eigenvalue equations for the resonator model can be obtained by applying the boundary condition of the structure of the resonator at both demagnetized and magnetized states. The complex permeability and permittivity are computed from the measured resonant frequencies and unloaded quality factors of the resonator using the mode splitting phenomenon. To verify the calculated magnetization values, the magneto-static simulation is performed by using CST EM studio based on the measured data of B–H curve. The measured complex permeability and permittivity of the demagnetized ferrite are verified by comparing with cavity perturbation method and statistic equation.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } This paper proposes an accurate method to calculate the permittivity and permeability of ferrites simultaneously at the demagnetized state. The eigenvalue equations for the resonator model can be obtained by applying the boundary condition of the structure of the resonator at both demagnetized and magnetized states. The complex permeability and permittivity are computed from the measured resonant frequencies and unloaded quality factors of the resonator using the mode splitting phenomenon. To verify the calculated magnetization values, the magneto-static simulation is performed by using CST EM studio based on the measured data of B–H curve. The measured complex permeability and permittivity of the demagnetized ferrite are verified by comparing with cavity perturbation method and statistic equation. |
2017 |
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| 249. | Junhyeong Park; Jong-Wook Ham; Seungwoon Park; Do-Hoon Kim; Seong-Jin Park; Hyunseong Kang; Seong-Ook Park Polyphase-Basis Discrete Cosine Transform for Real-Time Measurement of Heart Rate With CW Doppler Radar Journal Article IEEE Transactions on Microwave Theory and Techniques, 66 , pp. 1644 - 1659, 2017. Abstract | Links | BibTeX | 태그: International @article{Park2017e, title = {Polyphase-Basis Discrete Cosine Transform for Real-Time Measurement of Heart Rate With CW Doppler Radar}, author = {Junhyeong Park and Jong-Wook Ham and Seungwoon Park and Do-Hoon Kim and Seong-Jin Park and Hyunseong Kang and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/08123523.pdf}, doi = {10.1109/TMTT.2017.2772782}, year = {2017}, date = {2017-11-28}, journal = {IEEE Transactions on Microwave Theory and Techniques}, volume = {66}, pages = {1644 - 1659}, abstract = {This paper presents a novel polyphase-basis discrete cosine transform that can be used for challenges to observe heart rate (HR) variability and sudden changes of HR in short time. To succeed in the challenges, real-time measurement which requires a short window length is needed. As the window length decreases, however, increased main-lobe width (MLW) and sidelobe width (SLW) result errors in measuring HR. Unlike commonly used discrete Fourier transform (DFT), the proposed method is based on DCT, which improves the accuracy of measured HR even though the short window length is used for the real-time measurement of HR. We demonstrate that the DCT can give 2 times shorter MLW and SLW than the DFT can. To verify the proposed method, it is compared with well-known existing methods, arctangent demodulation and complex signal demodulation, which use the DFT. We measured HR using a 10.225-GHz continuous-wave Doppler radar. In each experiment, the window lengths of 3, 2, and 1.5 s were used to measure HR in real time. Experimental results show that the proposed method has lower mean and standard deviation of errors than the existing methods have.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } This paper presents a novel polyphase-basis discrete cosine transform that can be used for challenges to observe heart rate (HR) variability and sudden changes of HR in short time. To succeed in the challenges, real-time measurement which requires a short window length is needed. As the window length decreases, however, increased main-lobe width (MLW) and sidelobe width (SLW) result errors in measuring HR. Unlike commonly used discrete Fourier transform (DFT), the proposed method is based on DCT, which improves the accuracy of measured HR even though the short window length is used for the real-time measurement of HR. We demonstrate that the DCT can give 2 times shorter MLW and SLW than the DFT can. To verify the proposed method, it is compared with well-known existing methods, arctangent demodulation and complex signal demodulation, which use the DFT. We measured HR using a 10.225-GHz continuous-wave Doppler radar. In each experiment, the window lengths of 3, 2, and 1.5 s were used to measure HR in real time. Experimental results show that the proposed method has lower mean and standard deviation of errors than the existing methods have. |
| 248. | Seong-Jin Park; Seong-Ook Park; Dong-Chan Kim Experimental Validation for Millimeter-Wave Channel Measurement in Reverberation Chamber Conference International Symposium on Antenna and Propagation, Thailand, 2017. BibTeX | 태그: International @conference{Park2017, title = {Experimental Validation for Millimeter-Wave Channel Measurement in Reverberation Chamber}, author = {Seong-Jin Park and Seong-Ook Park and Dong-Chan Kim}, year = {2017}, date = {2017-11-02}, booktitle = {International Symposium on Antenna and Propagation}, address = {Thailand}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 247. | Seungwoon Park; Seong-Ook Park Configuration of an X-band FMCW Radar Targeted for Drone Detection Conference International Symposium on Antenna and Propagation, Thailand, 2017. BibTeX | 태그: International @conference{Park2017b, title = {Configuration of an X-band FMCW Radar Targeted for Drone Detection}, author = {Seungwoon Park and Seong-Ook Park}, editor = {International Symposium on Antenna and Propagation}, year = {2017}, date = {2017-11-02}, booktitle = {International Symposium on Antenna and Propagation}, address = {Thailand}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 246. | Dong-Chan Kim; Seong-Ook Park Digital Beamforming Technique with High Resolution Digital Phase Shifter and Digital Phase Calibration using SDR Conference International Symposium on Antenna and Propagation, Thailand, 2017. BibTeX | 태그: International @conference{Kim2017, title = {Digital Beamforming Technique with High Resolution Digital Phase Shifter and Digital Phase Calibration using SDR}, author = {Dong-Chan Kim and Seong-Ook Park}, year = {2017}, date = {2017-11-02}, booktitle = {International Symposium on Antenna and Propagation}, address = {Thailand}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 245. | Junhyeong Park; Seong-Ook Park A Down-Conversion Method for Attenuation of Leakage Signal in FMCW Radar Conference International Symposium on Antenna and Propagation, Thailand, 2017. BibTeX | 태그: International @conference{Park2017c, title = {A Down-Conversion Method for Attenuation of Leakage Signal in FMCW Radar}, author = {Junhyeong Park and Seong-Ook Park}, year = {2017}, date = {2017-11-02}, booktitle = {International Symposium on Antenna and Propagation}, address = {Thailand}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 244. | Dae-Hwan Jung; Seong-Ook Park Ku-band Car-borne FMCW Stripmap Synthetic Aperture Radar Journal Article International Symposium on Antenna and Propagation, 2017. BibTeX | 태그: International @article{Jung2017, title = {Ku-band Car-borne FMCW Stripmap Synthetic Aperture Radar}, author = {Dae-Hwan Jung and Seong-Ook Park}, year = {2017}, date = {2017-10-31}, journal = {International Symposium on Antenna and Propagation}, keywords = {International}, pubstate = {published}, tppubtype = {article} } |
| 243. | Chul-Ki Kim; Seong-Ook Park Advanced Measurement Method for evaluation of Microwave Properties using Rectangular Cavity Perturbation Technique Conference IEEE International Symposium on Radio-Frequency Integration Technology, Korea, 2017. BibTeX | 태그: International @conference{Kim2017b, title = {Advanced Measurement Method for evaluation of Microwave Properties using Rectangular Cavity Perturbation Technique}, author = {Chul-Ki Kim and Seong-Ook Park}, year = {2017}, date = {2017-09-01}, booktitle = {IEEE International Symposium on Radio-Frequency Integration Technology}, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 242. | Byung-Kwan Kim; Hyunseong Kang; Seong-Ook Park Experimental Analysis of Small Drone Polarimetry Based on Micro-Doppler Signature Journal Article IEEE Geoscience and Remote Sensing Letters, 14 , pp. 1670 - 1674, 2017. Abstract | Links | BibTeX | 태그: International @article{Kim2017f, title = {Experimental Analysis of Small Drone Polarimetry Based on Micro-Doppler Signature}, author = {Byung-Kwan Kim and Hyunseong Kang and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/08004431.pdf}, doi = {10.1109/LGRS.2017.2727824}, year = {2017}, date = {2017-08-09}, journal = {IEEE Geoscience and Remote Sensing Letters}, volume = {14}, pages = {1670 - 1674}, abstract = {We present a polarimetric analysis of small drones from different aspect angles. Polarimetric analysis can provide more information of a target, since the returned radar signal is affected by different wave polarization. The analysis is performed with micro-Doppler signature (MDS) to investigate micromotions of the drone detected by the radar. We measured operating small drones in an anechoic chamber from two aspect angles, 0° and 90°. An outdoor experiment was carried out with metal clutters for verification in real environment. The indoor analysis result shows that copolarized antenna receives signals better than cross polarized when the aspect angle is 0°, and vice versa. We also verified that cross-polarized antenna receives MDS from the drone better than copolarized antenna, from outdoors when an aspect angle is almost 90°. By utilizing the polarimetric characteristic of the drone at this frequency band, it is preferable to use a polarimetric radar for drone detection.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } We present a polarimetric analysis of small drones from different aspect angles. Polarimetric analysis can provide more information of a target, since the returned radar signal is affected by different wave polarization. The analysis is performed with micro-Doppler signature (MDS) to investigate micromotions of the drone detected by the radar. We measured operating small drones in an anechoic chamber from two aspect angles, 0° and 90°. An outdoor experiment was carried out with metal clutters for verification in real environment. The indoor analysis result shows that copolarized antenna receives signals better than cross polarized when the aspect angle is 0°, and vice versa. We also verified that cross-polarized antenna receives MDS from the drone better than copolarized antenna, from outdoors when an aspect angle is almost 90°. By utilizing the polarimetric characteristic of the drone at this frequency band, it is preferable to use a polarimetric radar for drone detection. |
| 241. | Tae-Wan Kim; Rao Shahid Aziz; Seong-Ook Park Design of patch loaded with metallic posts inside dielectric resonator antenna Journal Article IET Microwaves, Antennas & Propagation, 11 , pp. 1483 - 1487, 2017. Abstract | Links | BibTeX | 태그: International @article{Kim2017g, title = {Design of patch loaded with metallic posts inside dielectric resonator antenna}, author = {Tae-Wan Kim and Rao Shahid Aziz and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07999329.pdf}, doi = {10.1049/iet-map.2016.1026}, year = {2017}, date = {2017-08-03}, journal = {IET Microwaves, Antennas & Propagation}, volume = {11}, pages = {1483 - 1487}, abstract = {A new hybrid-antenna that is capable of wide-bandwidth operation and is small size is presented. The structure of the proposed antenna consists of a cylindrical dielectric resonator, metallic posts that are embedded in the resonator, and a rectangular patch. The proposed design generates three resonances: the full-cylindrical HE 11δ , half-HE 11δ -like mode, and radiation by the patch antenna. An electromagnetic analysis using a finite integration method (CST microwave studio) was performed to investigate the resonances. Furthermore, a prototype of antenna has fabricated for the experimental verification. The simulation results are in close agreement with the experimental findings. The proposed antenna offers a fractional bandwidth of 16.5% at the centre frequency of 9.27 GHz and a peak gain is >4.56 dBi in the matching band.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } A new hybrid-antenna that is capable of wide-bandwidth operation and is small size is presented. The structure of the proposed antenna consists of a cylindrical dielectric resonator, metallic posts that are embedded in the resonator, and a rectangular patch. The proposed design generates three resonances: the full-cylindrical HE 11δ , half-HE 11δ -like mode, and radiation by the patch antenna. An electromagnetic analysis using a finite integration method (CST microwave studio) was performed to investigate the resonances. Furthermore, a prototype of antenna has fabricated for the experimental verification. The simulation results are in close agreement with the experimental findings. The proposed antenna offers a fractional bandwidth of 16.5% at the centre frequency of 9.27 GHz and a peak gain is >4.56 dBi in the matching band. |
| 240. | Seong-Jin Park; Myung-Hun Jeong; Kyung-Bin Bae; Dong-Chan Kim; Laxmikant Minz; Seong-Ook Park IEEE Transactions on Antennas and Propagation, 65 , pp. 6669 - 6678, 2017. Abstract | Links | BibTeX | 태그: International @article{Park2018, title = {Performance Comparison of 2×2 MIMO Antenna Arrays With Different Configurations and Polarizations in Reverberation Chamber at Millimeter-Waveband}, author = {Seong-Jin Park and Myung-Hun Jeong and Kyung-Bin Bae and Dong-Chan Kim and Laxmikant Minz and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07997938.pdf}, doi = {10.1109/TAP.2017.2734242}, year = {2017}, date = {2017-07-31}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {65}, pages = {6669 - 6678}, abstract = {A performance comparison of 2 × 2 multiple-input multiple-output (MIMO) antenna arrays with different configurations and polarizations in a reverberation chamber (RC) is presented at the 28-GHz band. Eight types of antenna arrays are proposed according to different configurations and polarizations. The measured results of the antenna arrays show that they have similar antenna performance with respect to the same array size except for those concerning with the polarization. Based on these antenna arrays, we propose twelve cases of 2×2 MIMO antenna arrays with dual-separated polarizations between top and bottom side. A 28-GHz channel sounder and a vector network analyzer were used to measure complex channel transfer functions at the specific position of the rotating mode stirrer in the RC. The proposed MIMO antenna arrays were measured in the RC without and with absorbers. To clarify the channel performance for each case, a wideband channel capacity is calculated from the measured result.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } A performance comparison of 2 × 2 multiple-input multiple-output (MIMO) antenna arrays with different configurations and polarizations in a reverberation chamber (RC) is presented at the 28-GHz band. Eight types of antenna arrays are proposed according to different configurations and polarizations. The measured results of the antenna arrays show that they have similar antenna performance with respect to the same array size except for those concerning with the polarization. Based on these antenna arrays, we propose twelve cases of 2×2 MIMO antenna arrays with dual-separated polarizations between top and bottom side. A 28-GHz channel sounder and a vector network analyzer were used to measure complex channel transfer functions at the specific position of the rotating mode stirrer in the RC. The proposed MIMO antenna arrays were measured in the RC without and with absorbers. To clarify the channel performance for each case, a wideband channel capacity is calculated from the measured result. |
| 239. | Dae-Hwan Jung; Jang-Soo Chae; Seong-Ook Park Modified Range Doppler Algorithm for FMCW Auto SAR Conference Asian Workshop on Antennas and Propagation, Japan, 2017. BibTeX | 태그: International @conference{Jung2017b, title = {Modified Range Doppler Algorithm for FMCW Auto SAR}, author = {Dae-Hwan Jung and Jang-Soo Chae and Seong-Ook Park}, year = {2017}, date = {2017-06-28}, booktitle = {Asian Workshop on Antennas and Propagation}, address = {Japan}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 238. | Seungwoon Park; Junhyeong Park; Seong-Ook Park Mitigation of Leakage in FMCW Radar with Simple Metal Baffle Structure Conference International Symposium on Microwave and Optical Technology, Korea, 2017. BibTeX | 태그: International @conference{Park2017d, title = {Mitigation of Leakage in FMCW Radar with Simple Metal Baffle Structure}, author = {Seungwoon Park and Junhyeong Park and Seong-Ook Park}, year = {2017}, date = {2017-06-27}, booktitle = {International Symposium on Microwave and Optical Technology}, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 237. | Chul-Ki Kim; Seong-Ook Park Advanced Cavity Perturbation Method for Continuous Measurement of Microwave Properties Conference International Symposium on Microwave and Optical Technology, Korea, 2017. BibTeX | 태그: International @conference{Kim2017c, title = {Advanced Cavity Perturbation Method for Continuous Measurement of Microwave Properties}, author = {Chul-Ki Kim and Seong-Ook Park}, year = {2017}, date = {2017-06-27}, booktitle = {International Symposium on Microwave and Optical Technology}, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 236. | Tae-Wan Kim; Seong-Ook Park Microwave Measurement of Initial Properties of Ferrites using Mode Splitting Phenomenon by the Rod Resonator Method Conference Intenational Conference on the Computation of Electromagnetic Fields, Korea, 2017. BibTeX | 태그: International @conference{Kim2017d, title = {Microwave Measurement of Initial Properties of Ferrites using Mode Splitting Phenomenon by the Rod Resonator Method}, author = {Tae-Wan Kim and Seong-Ook Park}, year = {2017}, date = {2017-06-21}, booktitle = {Intenational Conference on the Computation of Electromagnetic Fields}, journal = {Intenational Conference on the Computation of Electromagnetic Fields}, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 235. | Jun-Seuk Suh; Laxmikant Minz; Dae-Hwan Jung; Hyunseong Kang; Jong-Wook Ham; Seong-Ook Park Drone-Based External Calibration of a Fully Synchronized Ku-Band Heterodyne FMCW Radar Journal Article IEEE Transactions on Instrumentation and Measurement, 66 , pp. 2189 - 2197, 2017. Abstract | Links | BibTeX | 태그: International @article{Suh2017, title = {Drone-Based External Calibration of a Fully Synchronized Ku-Band Heterodyne FMCW Radar}, author = {Jun-Seuk Suh and Laxmikant Minz and Dae-Hwan Jung and Hyunseong Kang and Jong-Wook Ham and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07896553.pdf}, doi = {10.1109/TIM.2017.2687518}, year = {2017}, date = {2017-04-12}, journal = {IEEE Transactions on Instrumentation and Measurement}, volume = {66}, pages = {2189 - 2197}, abstract = {This paper discusses a novel drone-based external radar calibration technique, which utilizes a metal sphere hanging from a drone. The advantages of drone-based calibration are introduced and applied to a dual intermediate-frequency frequency-modulation continuous-wave (FMCW) radar system, which was developed to detect a low radar cross section (RCS) target like a drone with high sensitivity. The developed radar system operates in 150-MHz bandwidth with a frequency sweeping time of 500 μm at Ku-band frequencies. A 75-Ω coaxial cable was utilized in the radar system to physically separate the transmitter (Tx) and receiver (Rx) modules for better isolation. The physical separation with a coaxial cable helps in reducing Tx leakage signal effect, which is a critical concern of typical FMCW radar system, and also it helps the proposed radar system to have higher sensitivity. The designed radar system is a wired system that is fully synchronized with an internal reference clock generator. Offset frequency and other compensation factors were calculated for the calibration of the radar system using a big size metal sphere hanging from a drone. We observed that the theoretical calculations using the standard radar equation and the measurement results on calibration are in good agreement with each other. Furthermore, the RCS value of a small size drone is also investigated using the calibrated radar system. The RCS value estimated for the drone was about -22 dBsm.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } This paper discusses a novel drone-based external radar calibration technique, which utilizes a metal sphere hanging from a drone. The advantages of drone-based calibration are introduced and applied to a dual intermediate-frequency frequency-modulation continuous-wave (FMCW) radar system, which was developed to detect a low radar cross section (RCS) target like a drone with high sensitivity. The developed radar system operates in 150-MHz bandwidth with a frequency sweeping time of 500 μm at Ku-band frequencies. A 75-Ω coaxial cable was utilized in the radar system to physically separate the transmitter (Tx) and receiver (Rx) modules for better isolation. The physical separation with a coaxial cable helps in reducing Tx leakage signal effect, which is a critical concern of typical FMCW radar system, and also it helps the proposed radar system to have higher sensitivity. The designed radar system is a wired system that is fully synchronized with an internal reference clock generator. Offset frequency and other compensation factors were calculated for the calibration of the radar system using a big size metal sphere hanging from a drone. We observed that the theoretical calculations using the standard radar equation and the measurement results on calibration are in good agreement with each other. Furthermore, the RCS value of a small size drone is also investigated using the calibrated radar system. The RCS value estimated for the drone was about -22 dBsm. |
| 234. | Tae-Wan Kim; Seong-Ook Park Novel theoretical model of mode splitting behavior of cylindrical ferrite resonator antenna Conference IEEE International Conference on Computational Electromagnetics, Japan, 2017. BibTeX | 태그: International @conference{Kim2017e, title = {Novel theoretical model of mode splitting behavior of cylindrical ferrite resonator antenna}, author = {Tae-Wan Kim and Seong-Ook Park}, year = {2017}, date = {2017-03-09}, booktitle = {IEEE International Conference on Computational Electromagnetics}, address = {Japan}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 233. | Woncheol Lee; Yang-Ki Hong; Jihoon Park; Jaejin Lee; In-Seung Baek; Nam-Pal Hur; Won-Mo Seong; Seong-Ook Park A Simple Wireless Power Charging Antenna System: Evaluation of Ferrite Sheet Journal Article IEEE Transactions on Magnetics, 53 , 2017. Abstract | Links | BibTeX | 태그: International @article{Lee2017, title = {A Simple Wireless Power Charging Antenna System: Evaluation of Ferrite Sheet}, author = {Woncheol Lee and Yang-Ki Hong and Jihoon Park and Jaejin Lee and In-Seung Baek and Nam-Pal Hur and Won-Mo Seong and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07867861.pdf}, doi = {10.1109/TMAG.2017.2676099}, year = {2017}, date = {2017-03-01}, journal = {IEEE Transactions on Magnetics}, volume = {53}, abstract = {We report a simple wireless power charging (WPC) antenna system (50 mm × 40 mm × 0.1 mm) for use in simulating power transfer efficiency (η) with and without ferrite and a metallic object (battery case), thereby identifying suitable magnetic parameters and ferrite sheet thickness. The simulation results suggest that magnetic loss tangent (tan δ μ ) and permeability (μ') need to be less than 0.05 and higher than 125 at 13.56 MHz, respectively, to achieve at least 75% of the transfer efficiency (η max ) of the WPC antenna without ferrite and the metallic object. Accordingly, we have fabricated Ni x Zn 0.85-x Cu 0.15 Fe 2 O 4 (x = 0.32 - 0.38) spinel ferrites using a one-step sintering process and obtained relatively high μ' of 169 and low tan δ μ of 0.1 with a nickel (Ni) concentration of 0.38. This magnetic loss is still too high to achieve 75% of the η max value. In order to further reduce the magnetic loss, a two-step sintering process was used. The two-step sintered Ni 0.38 Zn 0.47 Cu 0.15 Fe 2 O 4 shows μ' of 132 and a tan δ μ of 0.03 at 13.56 MHz, respectively. Therefore, this ferrite meets criteria identified by the transfer efficiency simulation and is a good candidate for 13.56-MHz wireless power transfer charging antenna system. In addition, our designed WPC system is capable of evaluating other magnetic materials that are suitable for WPC antenna applications.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } We report a simple wireless power charging (WPC) antenna system (50 mm × 40 mm × 0.1 mm) for use in simulating power transfer efficiency (η) with and without ferrite and a metallic object (battery case), thereby identifying suitable magnetic parameters and ferrite sheet thickness. The simulation results suggest that magnetic loss tangent (tan δ μ ) and permeability (μ') need to be less than 0.05 and higher than 125 at 13.56 MHz, respectively, to achieve at least 75% of the transfer efficiency (η max ) of the WPC antenna without ferrite and the metallic object. Accordingly, we have fabricated Ni x Zn 0.85-x Cu 0.15 Fe 2 O 4 (x = 0.32 - 0.38) spinel ferrites using a one-step sintering process and obtained relatively high μ' of 169 and low tan δ μ of 0.1 with a nickel (Ni) concentration of 0.38. This magnetic loss is still too high to achieve 75% of the η max value. In order to further reduce the magnetic loss, a two-step sintering process was used. The two-step sintered Ni 0.38 Zn 0.47 Cu 0.15 Fe 2 O 4 shows μ' of 132 and a tan δ μ of 0.03 at 13.56 MHz, respectively. Therefore, this ferrite meets criteria identified by the transfer efficiency simulation and is a good candidate for 13.56-MHz wireless power transfer charging antenna system. In addition, our designed WPC system is capable of evaluating other magnetic materials that are suitable for WPC antenna applications. |
| 232. | Tae-Wan Kim; Byeong-Yong Park; Seong-Ook Park A Theoretical Model for Frequency Response of a Cylindrical Resonator Antenna With the H E-11 delta Mode Splitting Behavior Journal Article IEEE Transactions on Antennas and Propagation, 65 , pp. 1615 - 1623, 2017. Abstract | Links | BibTeX | 태그: International @article{Kim2017h, title = {A Theoretical Model for Frequency Response of a Cylindrical Resonator Antenna With the H E-11 delta Mode Splitting Behavior}, author = {Tae-Wan Kim and Byeong-Yong Park and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07856949.pdf}, doi = {10.1109/TAP.2017.2670442}, year = {2017}, date = {2017-02-15}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {65}, pages = {1615 - 1623}, abstract = {This paper presents a theoretical model of a cylindrical hybrid resonator antenna. The hybrid resonator consists of an annular ring ferrite and a cylindrical dielectric with a dc magnetic bias field, applied in direction parallel to the antenna height. The HE 11δ mode splitting behavior caused by tensor nature of the permeability of a biased ferrite is investigated. To validate the proposed approximate analysis, an experimental investigation of an antenna loaded with a biased ferrite is also presented. The presented theory is shown to demonstrate the measured results. The antenna is found to be used as frequency, bandwidth, and polarization tunable antenna. The operating frequency can be chosen in the range from 9.07 to 9.84 GHz. In addition, the bandwidth can be extended from 7.3% to 12.7%. The polarization can be switched from linear to circular. The features mentioned earlier can be achieved by applying the appropriate magnetic field due to the HE 11δ mode splitting behavior. The theoretical model, the design process, and the measured results are presented in detail. The antenna is also found to be capable of tuning the operating frequency as well as the frequency tuning range without changing the overall size of the resonator.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } This paper presents a theoretical model of a cylindrical hybrid resonator antenna. The hybrid resonator consists of an annular ring ferrite and a cylindrical dielectric with a dc magnetic bias field, applied in direction parallel to the antenna height. The HE 11δ mode splitting behavior caused by tensor nature of the permeability of a biased ferrite is investigated. To validate the proposed approximate analysis, an experimental investigation of an antenna loaded with a biased ferrite is also presented. The presented theory is shown to demonstrate the measured results. The antenna is found to be used as frequency, bandwidth, and polarization tunable antenna. The operating frequency can be chosen in the range from 9.07 to 9.84 GHz. In addition, the bandwidth can be extended from 7.3% to 12.7%. The polarization can be switched from linear to circular. The features mentioned earlier can be achieved by applying the appropriate magnetic field due to the HE 11δ mode splitting behavior. The theoretical model, the design process, and the measured results are presented in detail. The antenna is also found to be capable of tuning the operating frequency as well as the frequency tuning range without changing the overall size of the resonator. |
2016 |
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| 231. | Dong-Uk Sim; Jong-Hwa Kwon; Seong-Ook Park Design of multiband electromagnetic wave absorber based on a periodic surface for electromagnetic wave measurement facility applications Journal Article Microwave and Optical Technology Letters, 59 , pp. 478 - 481, 2016. Abstract | Links | BibTeX | 태그: International @article{Sim2016, title = {Design of multiband electromagnetic wave absorber based on a periodic surface for electromagnetic wave measurement facility applications}, author = {Dong-Uk Sim and Jong-Hwa Kwon and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Sim_et_al-2017-Microwave_and_Optical_Technology_Letters.pdf}, doi = {10.1002/mop.30318}, year = {2016}, date = {2016-12-22}, journal = {Microwave and Optical Technology Letters}, volume = {59}, pages = {478 - 481}, abstract = {In this paper, the periodic structure‐based absorber operating at dual‐band or more for applying to new electromagnetic wave measurement facility that does not contain a conventional pyramidal absorber is presented. To achieve the objective, the absorber structure takes the format of two‐layer periodic surfaces. Based on the logical design principles, the parametric study results to obtain the desired performance and the final experimental result are addressed. The measured result shows a broadband reflectivity characteristic from 0.60 to 3.27 GHz on the basis of below −10 dB. As a result, the absorber shows the performance supporting CDMA, WCDMA, and WLAN bands in the electromagnetic wave measurement facility.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } In this paper, the periodic structure‐based absorber operating at dual‐band or more for applying to new electromagnetic wave measurement facility that does not contain a conventional pyramidal absorber is presented. To achieve the objective, the absorber structure takes the format of two‐layer periodic surfaces. Based on the logical design principles, the parametric study results to obtain the desired performance and the final experimental result are addressed. The measured result shows a broadband reflectivity characteristic from 0.60 to 3.27 GHz on the basis of below −10 dB. As a result, the absorber shows the performance supporting CDMA, WCDMA, and WLAN bands in the electromagnetic wave measurement facility. |
| 230. | Myung-Hun Jeong; Tae-Wan Kim; Seong-Ook Park Characteristics Calculation of Ferrite Material Using Frequency Tunable Resonator Journal Article IEEE Transactions on Magnetics, 53 , 2016. Abstract | Links | BibTeX | 태그: International @article{Jeong2016, title = {Characteristics Calculation of Ferrite Material Using Frequency Tunable Resonator}, author = {Myung-Hun Jeong and Tae-Wan Kim and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07781609.pdf}, doi = {10.1109/TMAG.2016.2638802}, year = {2016}, date = {2016-12-12}, journal = {IEEE Transactions on Magnetics}, volume = {53}, abstract = {This paper presents an efficient method to measure the permittivity, permeability, and magnetization of ferrite at various resonance frequencies of ferrite resonator. A cylindrical dielectric rod is inserted to annular ring ferrite for tuning the resonance frequency of the ferrite resonator without changing the length of the resonator. The permeability and permittivity of ferrite are calculated using a characteristic equation for resonator in a demagnetized state. The permittivity is compared with the measured results by the cavity perturbation method to verify the calculated results. We analyzed the electromagnetic fields in each region of ferrite, and derived 8 × 8 eigenvalue matrix for the mode-splitting behavior on the HE +111 /HE -111 mode. The induced magnetization of ferrite in the partially magnetized state is calculated by a nonlinear system with the measured resonance frequency. The calculated magnetization of the resonator is a critical parameter to analyze ferrite material, so the calculated results are verified by the magneto-static simulation based on the measured data of B-H curve. Finally, the permeability tensor components at various frequencies are obtained by statistic equations.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } This paper presents an efficient method to measure the permittivity, permeability, and magnetization of ferrite at various resonance frequencies of ferrite resonator. A cylindrical dielectric rod is inserted to annular ring ferrite for tuning the resonance frequency of the ferrite resonator without changing the length of the resonator. The permeability and permittivity of ferrite are calculated using a characteristic equation for resonator in a demagnetized state. The permittivity is compared with the measured results by the cavity perturbation method to verify the calculated results. We analyzed the electromagnetic fields in each region of ferrite, and derived 8 × 8 eigenvalue matrix for the mode-splitting behavior on the HE +111 /HE -111 mode. The induced magnetization of ferrite in the partially magnetized state is calculated by a nonlinear system with the measured resonance frequency. The calculated magnetization of the resonator is a critical parameter to analyze ferrite material, so the calculated results are verified by the magneto-static simulation based on the measured data of B-H curve. Finally, the permeability tensor components at various frequencies are obtained by statistic equations. |
| 229. | Dong-Hun Shin; Dae-Hwan Jung; Dong-Chan Kim; Jong-Wook Ham; Seong-Ook Park A Distributed FMCW Radar System Based on Fiber-Optic Links for Small Drone Detection Journal Article IEEE Transactions on Instrumentation and Measurement, 66 , pp. 340 - 347, 2016. Abstract | Links | BibTeX | 태그: International @article{Shin2016, title = {A Distributed FMCW Radar System Based on Fiber-Optic Links for Small Drone Detection}, author = {Dong-Hun Shin and Dae-Hwan Jung and Dong-Chan Kim and Jong-Wook Ham and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07762208.pdf}, doi = {10.1109/TIM.2016.2626038}, year = {2016}, date = {2016-11-29}, journal = {IEEE Transactions on Instrumentation and Measurement}, volume = {66}, pages = {340 - 347}, abstract = {This paper discusses a distributed frequency modulation continuous wave radar system. This K-band radar system has high sensitivity, linearity, and flatness to detect low-radar cross section targets and measure their range and velocity. To reduce the leakage between a transmitter and a receiver, the system uses not RF cables but fiber-optic links that have low distortion characteristics and low propagation loss. The transmitter and the receiver are each mounted on a designed fixture to reduce the ground reflections. In addition, they are located on different platforms to reduce the leakage signal flowing directly from the transmitter to the receiver. Measurements in terms of the range and the velocity of a small drone have been carried out to evaluate the proposed distributed radar system. The results show that we can clearly detect the small drone within a 500 m range, which demonstrates the high sensitivity of the system and high isolation between the transmitter and the receiver.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } This paper discusses a distributed frequency modulation continuous wave radar system. This K-band radar system has high sensitivity, linearity, and flatness to detect low-radar cross section targets and measure their range and velocity. To reduce the leakage between a transmitter and a receiver, the system uses not RF cables but fiber-optic links that have low distortion characteristics and low propagation loss. The transmitter and the receiver are each mounted on a designed fixture to reduce the ground reflections. In addition, they are located on different platforms to reduce the leakage signal flowing directly from the transmitter to the receiver. Measurements in terms of the range and the velocity of a small drone have been carried out to evaluate the proposed distributed radar system. The results show that we can clearly detect the small drone within a 500 m range, which demonstrates the high sensitivity of the system and high isolation between the transmitter and the receiver. |
| 228. | Hyunseong Kang; Seong-Ook Park Mushroom meta-material based substrate integrated waveguide cavity backed slot antenna with broadband and reduced back radiation Journal Article IET Microwaves, Antennas & Propagation, 10 , pp. 1598 - 1603, 2016. Abstract | Links | BibTeX | 태그: International @article{Kang2016, title = {Mushroom meta-material based substrate integrated waveguide cavity backed slot antenna with broadband and reduced back radiation}, author = {Hyunseong Kang and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07755934.pdf}, doi = {10.1049/iet-map.2016.0056}, year = {2016}, date = {2016-11-24}, journal = {IET Microwaves, Antennas & Propagation}, volume = {10}, pages = {1598 - 1603}, abstract = {A novel substrate integrated waveguide (SIW) cavity backed slot antenna with low back radiation is proposed in this study. This newly proposed meta-mushroom antenna uses a SIW cavity to decrease the back radiation. It is fed by the SIW cavity backed slot and radiates by meta-mushroom structure. This antenna exhibits broadband characteristics due to the meta-mushroom structure and a bow-tie slot on the SIW. The back radiation of the proposed antenna is considerably diminished by the SIW cavity located at the back side maintaining high gain performance. After all, its front-to-back ratio is increased and maintained over 19.2 dB in the operating frequency band, 4.5-5.6 GHz. Full-wave simulation and experiments results of the proposed antenna are demonstrated.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } A novel substrate integrated waveguide (SIW) cavity backed slot antenna with low back radiation is proposed in this study. This newly proposed meta-mushroom antenna uses a SIW cavity to decrease the back radiation. It is fed by the SIW cavity backed slot and radiates by meta-mushroom structure. This antenna exhibits broadband characteristics due to the meta-mushroom structure and a bow-tie slot on the SIW. The back radiation of the proposed antenna is considerably diminished by the SIW cavity located at the back side maintaining high gain performance. After all, its front-to-back ratio is increased and maintained over 19.2 dB in the operating frequency band, 4.5-5.6 GHz. Full-wave simulation and experiments results of the proposed antenna are demonstrated. |
| 227. | Byung-Kwan Kim; Hyunseong Kang; Seong-Ook Park Drone Classification Using Convolutional Neural Networks With Merged Doppler Images Journal Article IEEE Geoscience and Remote Sensing Letters, 14 , pp. 38 - 42, 2016. Abstract | Links | BibTeX | 태그: International @article{Kim2016c, title = {Drone Classification Using Convolutional Neural Networks With Merged Doppler Images}, author = {Byung-Kwan Kim and Hyunseong Kang and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07748505.pdf}, doi = {10.1109/LGRS.2016.2624820}, year = {2016}, date = {2016-11-18}, journal = {IEEE Geoscience and Remote Sensing Letters}, volume = {14}, pages = {38 - 42}, abstract = {We propose a drone classification method based on convolutional neural network (CNN) and micro-Doppler signature (MDS). The MDS only presents Doppler information in time domain. The frequency domain representation of MDS is called as cadence-velocity diagram (CVD). To analyze the Doppler information of drone in time and frequency domain, we propose a new image by merging MDS and CVD, as merged Doppler image. GoogLeNet, a CNN structure, is utilized for the proposed image data set because of its high performance and optimized computing resources. The image data set is generated by the returned Ku-band frequency modulation continuous wave radar signal. Proposed approach is tested and verified in two different environments, anechoic chamber and outdoor. First, we tested our approach with different numbers of operating motor and aspect angle of a drone. The proposed method improved the accuracy from 89.3% to 94.7%. Second, two types of drone at the 50 and 100 m height are classified and showed 100% accuracy due to distinct difference in the result images.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } We propose a drone classification method based on convolutional neural network (CNN) and micro-Doppler signature (MDS). The MDS only presents Doppler information in time domain. The frequency domain representation of MDS is called as cadence-velocity diagram (CVD). To analyze the Doppler information of drone in time and frequency domain, we propose a new image by merging MDS and CVD, as merged Doppler image. GoogLeNet, a CNN structure, is utilized for the proposed image data set because of its high performance and optimized computing resources. The image data set is generated by the returned Ku-band frequency modulation continuous wave radar signal. Proposed approach is tested and verified in two different environments, anechoic chamber and outdoor. First, we tested our approach with different numbers of operating motor and aspect angle of a drone. The proposed method improved the accuracy from 89.3% to 94.7%. Second, two types of drone at the 50 and 100 m height are classified and showed 100% accuracy due to distinct difference in the result images. |
| 226. | Byeong-Yong Park; Tae-Wan Kim; AK Ayra; Seung-Young Park; Seong-Ook Park Theory and Design of a Cylindrical Ferrite Resonator Antenna Using HE11 delta Mode Splitting Behavior Journal Article IEEE Transactions on Antennas and Propagation, 64 , pp. 5547 - 5552, 2016. Abstract | Links | BibTeX | 태그: International @article{Park2016e, title = {Theory and Design of a Cylindrical Ferrite Resonator Antenna Using HE11 delta Mode Splitting Behavior}, author = {Byeong-Yong Park and Tae-Wan Kim and AK Ayra and Seung-Young Park and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07726002.pdf}, doi = {10.1109/TAP.2016.2623486}, year = {2016}, date = {2016-10-31}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {64}, pages = {5547 - 5552}, abstract = {A theoretical model of a cylindrical ferrite resonator antenna with a dc magnetic bias, applied in the direction parallel to the antenna height, is proposed. HE 11δ mode splitting behavior caused by tensor nature of the permeability of a biased ferrite is investigated. The proposed model is validated through an experimental investigation of the HE 11δ mode antenna. This communication utilizes a Li-ferrite suitable for the antenna applications. The presented theory is shown to correlate well with the measured results. It is also found that HE 11δ mode splitting behavior of the antenna involves frequency and polarization, and bandwidth tuning performances. Therefore, the antenna is a good candidate for a multifunctional antenna.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } A theoretical model of a cylindrical ferrite resonator antenna with a dc magnetic bias, applied in the direction parallel to the antenna height, is proposed. HE 11δ mode splitting behavior caused by tensor nature of the permeability of a biased ferrite is investigated. The proposed model is validated through an experimental investigation of the HE 11δ mode antenna. This communication utilizes a Li-ferrite suitable for the antenna applications. The presented theory is shown to correlate well with the measured results. It is also found that HE 11δ mode splitting behavior of the antenna involves frequency and polarization, and bandwidth tuning performances. Therefore, the antenna is a good candidate for a multifunctional antenna. |
| 225. | Seong-Ook Park; Tae-Wan Kim; Byeong-Yong Park Analysis of low loss magneto-dielectric antenna for the mobile communication Conference International Symposium on Antenna and Propagation, Japan, 2016. BibTeX | 태그: International @conference{Park2016, title = {Analysis of low loss magneto-dielectric antenna for the mobile communication}, author = {Seong-Ook Park and Tae-Wan Kim and Byeong-Yong Park}, year = {2016}, date = {2016-10-24}, booktitle = {International Symposium on Antenna and Propagation}, address = {Japan}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 224. | Jung-Hwan Hwang; Tae-Wook Kang; Jong-Hwa Kwon; Seong-Ook Park Effect of Electromagnetic Interference on Human Body Communication Journal Article IEEE Transactions on Electromagnetic Compatibility, 59 , pp. 48 - 57, 2016. Abstract | Links | BibTeX | 태그: International @article{Hwang2016, title = {Effect of Electromagnetic Interference on Human Body Communication}, author = {Jung-Hwan Hwang and Tae-Wook Kang and Jong-Hwa Kwon and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07574274.pdf}, doi = {10.1109/TEMC.2016.2598582}, year = {2016}, date = {2016-09-22}, journal = {IEEE Transactions on Electromagnetic Compatibility}, volume = {59}, pages = {48 - 57}, abstract = {In human body communication (HBC), the human body is used as a medium for transmitting data between devices as a replacement for wired and wireless technologies. The human body functions as an antenna in the low-frequency band used by HBC. Owing to this antenna function, electromagnetic waves radiating from electronic devices or wireless services cause electromagnetic interference (EMI) in HBC devices. This paper addresses such EMI in HBC devices. The interference signal caused by EMI was measured while the human subject, who was using an HBC device, was exposed to a general EMI environment at multiple sites. Using the interference model obtained from the measured interference signals, bit-error-rate degradation caused by the interference signal was simulated. The interference model presented in this paper can be effectively used to achieve reliable data communication in various HBC devices.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } In human body communication (HBC), the human body is used as a medium for transmitting data between devices as a replacement for wired and wireless technologies. The human body functions as an antenna in the low-frequency band used by HBC. Owing to this antenna function, electromagnetic waves radiating from electronic devices or wireless services cause electromagnetic interference (EMI) in HBC devices. This paper addresses such EMI in HBC devices. The interference signal caused by EMI was measured while the human subject, who was using an HBC device, was exposed to a general EMI environment at multiple sites. Using the interference model obtained from the measured interference signals, bit-error-rate degradation caused by the interference signal was simulated. The interference model presented in this paper can be effectively used to achieve reliable data communication in various HBC devices. |
| 223. | Junhyeong Park; Seong-Ook Park; Ki-Bok Kong Measurement and Analysis of Weather Phenomena with K-Band Rain Radar Conference URSI Asia-Pacific Radio Science Conference, Korea, 2016. BibTeX | 태그: International @conference{Park2016b, title = {Measurement and Analysis of Weather Phenomena with K-Band Rain Radar}, author = {Junhyeong Park and Seong-Ook Park and Ki-Bok Kong}, year = {2016}, date = {2016-08-24}, booktitle = {URSI Asia-Pacific Radio Science Conference}, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 222. | Seong-Jin Park; Seong-Ook Park Circularly Polarized Substrate-Integrated-Waveguide Antenna Array for Millimeter-Wave Handset Device Conference URSI Asia-Pacific Radio Science Conference, Korea, 2016. BibTeX | 태그: International @conference{Park2016c, title = {Circularly Polarized Substrate-Integrated-Waveguide Antenna Array for Millimeter-Wave Handset Device}, author = {Seong-Jin Park and Seong-Ook Park}, year = {2016}, date = {2016-08-24}, booktitle = {URSI Asia-Pacific Radio Science Conference}, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 221. | Chul-Ki Kim; Seong-Ook Park Analysis of the Adavanced Cavity Perturbation Method for Microwave Properties Conference URSI Asia-Pacific Radio Science Conference, Korea, 2016. BibTeX | 태그: International @conference{Kim2016, title = {Analysis of the Adavanced Cavity Perturbation Method for Microwave Properties}, author = {Chul-Ki Kim and Seong-Ook Park}, year = {2016}, date = {2016-08-24}, booktitle = {URSI Asia-Pacific Radio Science Conference}, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 220. | Tae-Wan Kim; Seong-Ook Park Measuremet of Properties of Ferrites at Partially Magnetized State using Cylindrical Resonator Conference URSI Asia-Pacific Radio Science Conference, Korea, 2016. BibTeX | 태그: International @conference{Kim2016b, title = {Measuremet of Properties of Ferrites at Partially Magnetized State using Cylindrical Resonator}, author = {Tae-Wan Kim and Seong-Ook Park}, year = {2016}, date = {2016-08-24}, booktitle = {URSI Asia-Pacific Radio Science Conference}, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } |
| 219. | Seong-Jin Park; Seong-Ook Park LHCP and RHCP Substrate Integrated Waveguide Antenna Arrays for Millimeter-Wave Applications Journal Article IEEE Antennas and Wireless Propagation Letters, 16 , pp. 601 - 604, 2016. Abstract | Links | BibTeX | 태그: International @article{Park2016d, title = {LHCP and RHCP Substrate Integrated Waveguide Antenna Arrays for Millimeter-Wave Applications}, author = {Seong-Jin Park and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07523214.pdf}, doi = {10.1109/LAWP.2016.2594081}, year = {2016}, date = {2016-07-27}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {16}, pages = {601 - 604}, abstract = {Left-hand and right-hand circularly polarized (LHCP and RHCP) substrate integrated waveguide (SIW) antenna arrays are presented at the 28-GHz band for millimeterwave (mm-wave) applications. Two types of circularly polarized (CP) antenna elements are designed to achieve respective LHCP and RHCP performance. Eight-element LHCP and RHCP antenna arrays have been implemented with feeding networks and measured. Based on the measurement, the LHCP and RHCP antenna arrays have impedance bandwidths of 1.54 and 1.7 GHz within |S 11 | <; -10 dB, whereas 3-dB axial-ratio bandwidths are 1.1 and 1.3 GHz, respectively. Each of the fabricated LHCP and RHCP antenna arrays is accomplished with a gain up to 13.09 and 13.52 dBi. Most of the measured results are validated with the simulated ones. The proposed CP antenna arrays can provide low-cost, broadband characteristics, and high-gain radiation performance with CP properties for mm-wave applications.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Left-hand and right-hand circularly polarized (LHCP and RHCP) substrate integrated waveguide (SIW) antenna arrays are presented at the 28-GHz band for millimeterwave (mm-wave) applications. Two types of circularly polarized (CP) antenna elements are designed to achieve respective LHCP and RHCP performance. Eight-element LHCP and RHCP antenna arrays have been implemented with feeding networks and measured. Based on the measurement, the LHCP and RHCP antenna arrays have impedance bandwidths of 1.54 and 1.7 GHz within |S 11 | <; -10 dB, whereas 3-dB axial-ratio bandwidths are 1.1 and 1.3 GHz, respectively. Each of the fabricated LHCP and RHCP antenna arrays is accomplished with a gain up to 13.09 and 13.52 dBi. Most of the measured results are validated with the simulated ones. The proposed CP antenna arrays can provide low-cost, broadband characteristics, and high-gain radiation performance with CP properties for mm-wave applications. |
| 218. | Jung-Hwan Hwang; Tae-Wook Kang; Chang-Hee Hyoung; Seong-Ook Park Bit error rate degradation model for time-delay parameter of co-channel interference occurring in human body communication Journal Article IET Communications, 10 , pp. 724 - 733, 2016. Abstract | Links | BibTeX | 태그: International @article{Hwang2016b, title = {Bit error rate degradation model for time-delay parameter of co-channel interference occurring in human body communication}, author = {Jung-Hwan Hwang and Tae-Wook Kang and Chang-Hee Hyoung and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07452484.pdf}, doi = {10.1049/iet-com.2015.0689}, year = {2016}, date = {2016-04-14}, journal = {IET Communications}, volume = {10}, pages = {724 - 733}, abstract = {Human body communication (HBC) is a new technology for mobile and wearable devices operating over body area networks. In HBC, the body is used as a medium for transmitting data between devices to replace wired and wireless technologies. This study examines the bit error rate (BER) degradation experienced by HBC systems under the presence of co-channel interference. A degradation model is proposed to estimate the change in BER, and a selective simulation method is proposed to obtain the BER performance with a small exceedance probability and a small number of BER samples.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Human body communication (HBC) is a new technology for mobile and wearable devices operating over body area networks. In HBC, the body is used as a medium for transmitting data between devices to replace wired and wireless technologies. This study examines the bit error rate (BER) degradation experienced by HBC systems under the presence of co-channel interference. A degradation model is proposed to estimate the change in BER, and a selective simulation method is proposed to obtain the BER performance with a small exceedance probability and a small number of BER samples. |
| 217. | Rao Shahid Aziz; AK Ayra; Seong-Ook Park Multiband Full-Metal-Rimmed Antenna Design for Smartphones Journal Article IEEE Antennas and Wireless Propagation Letters, 15 , pp. 1987 - 1990, 2016. Abstract | Links | BibTeX | 태그: International @article{Aziz2016, title = {Multiband Full-Metal-Rimmed Antenna Design for Smartphones}, author = {Rao Shahid Aziz and AK Ayra and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07442781.pdf}, doi = {10.1109/LAWP.2016.2548018}, year = {2016}, date = {2016-03-29}, journal = {IEEE Antennas and Wireless Propagation Letters}, volume = {15}, pages = {1987 - 1990}, abstract = {In this letter, a multiband full-metal-rimmed antenna covering 10 frequency bands for personal wireless communication terminals is presented. The design antenna is based on simple and effective techniques that are used for metal-rimmed smartphone applications. The proposed antenna with full metal rim is designed on RO4350B substrate within the volume of 130 × 70 × 5 mm 3 . We employed RO4350B substrate with inserted vias as metal rim with height of 5 mm, which surrounds the inner circuit board. The circuit board substrate has a ground plane, which is connected to the metal rim via extended substrate patch. This connection divides the rim into two metal rim strips. The combination of these two strips allows the design to operate on 10 bands. Performing perturbation on the ground plane further adds more operating bands and makes the design an excellent candidate for multiband operation. The designed antenna can be used to serve on GSM850/900, GPS, DCS, PCS, UMTS, WiBro at 2.35 GHz, Bluetooth, ISM, SDM-B at 2.65 GHz, WiMAX at 3.5 GHz, and C-band at 4 GHz wireless communication bands. A prototype antenna was fabricated and tested for input reflection coefficient, radiation performances, antenna gain, and efficiency. The measured and simulated results have been presented and discussed.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } In this letter, a multiband full-metal-rimmed antenna covering 10 frequency bands for personal wireless communication terminals is presented. The design antenna is based on simple and effective techniques that are used for metal-rimmed smartphone applications. The proposed antenna with full metal rim is designed on RO4350B substrate within the volume of 130 × 70 × 5 mm 3 . We employed RO4350B substrate with inserted vias as metal rim with height of 5 mm, which surrounds the inner circuit board. The circuit board substrate has a ground plane, which is connected to the metal rim via extended substrate patch. This connection divides the rim into two metal rim strips. The combination of these two strips allows the design to operate on 10 bands. Performing perturbation on the ground plane further adds more operating bands and makes the design an excellent candidate for multiband operation. The designed antenna can be used to serve on GSM850/900, GPS, DCS, PCS, UMTS, WiBro at 2.35 GHz, Bluetooth, ISM, SDM-B at 2.65 GHz, WiMAX at 3.5 GHz, and C-band at 4 GHz wireless communication bands. A prototype antenna was fabricated and tested for input reflection coefficient, radiation performances, antenna gain, and efficiency. The measured and simulated results have been presented and discussed. |
| 216. | Ki-Bok Kong; Woo-Ram Jeong; Seong-Ook Park Design and initial measurements of K-band FMCW rain radar with high resolution Journal Article Microwave and Optical Technology Letters, 58 , pp. 817 - 822, 2016. Abstract | Links | BibTeX | 태그: International @article{Kong2016, title = {Design and initial measurements of K-band FMCW rain radar with high resolution}, author = {Ki-Bok Kong and Woo-Ram Jeong and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Kong_et_al-2016-Microwave_and_Optical_Technology_Letters.pdf}, doi = {10.1002/mop.29677}, year = {2016}, date = {2016-02-24}, journal = {Microwave and Optical Technology Letters}, volume = {58}, pages = {817 - 822}, abstract = {This paper presents an FMCW K‐band rain radar with the property of high resolution. The radar system was designed for measurement of localized torrential rain. Using DDS and FPGA control, heterodyne modulation was used to generate the FMCW down‐chirp signal with 50 MHz bandwidth, and emitted a K‐band signal with nominal power of 125 mW in the vertical direction. To obtain high resolution for the Doppler spectrum, the radar system used a coherent signal processing method. Several experiments were conducted and the results were compared with data from the meteorological administration.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } This paper presents an FMCW K‐band rain radar with the property of high resolution. The radar system was designed for measurement of localized torrential rain. Using DDS and FPGA control, heterodyne modulation was used to generate the FMCW down‐chirp signal with 50 MHz bandwidth, and emitted a K‐band signal with nominal power of 125 mW in the vertical direction. To obtain high resolution for the Doppler spectrum, the radar system used a coherent signal processing method. Several experiments were conducted and the results were compared with data from the meteorological administration. |
| 215. | Tae-Wan Kim; Byeong-Yong Park; Seung-Young Park; Seong-Ook Park Calculation of Magnetization and Permeability Tensor of a Partially Magnetized Cylindrical Ferrite Resonator Journal Article IEEE Magnetics Letters, 7 , 2016. Abstract | Links | BibTeX | 태그: International @article{Kim2016d, title = {Calculation of Magnetization and Permeability Tensor of a Partially Magnetized Cylindrical Ferrite Resonator}, author = {Tae-Wan Kim and Byeong-Yong Park and Seung-Young Park and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/07414421.pdf}, doi = {10.1109/LMAG.2016.2532319}, year = {2016}, date = {2016-02-19}, journal = {IEEE Magnetics Letters}, volume = {7}, abstract = {A accurate method of calculating a magnetization and permeability tensor of ferrites is proposed in this paper. We introduce a cylindrical ferrite resonator that is located between parallel metal plates. We theoretically derive exact eigenvalue equations for the mode-splitting phenomenon of the HE111 mode. We also show that the mode-splitting behavior depends on a single magnetization value of the ferrite. The magnetization and permeability tensor components are computed from the measured resonant frequencies of the resonator. We present an analysis of cylindrical ferrite resonator and its experimental results.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } A accurate method of calculating a magnetization and permeability tensor of ferrites is proposed in this paper. We introduce a cylindrical ferrite resonator that is located between parallel metal plates. We theoretically derive exact eigenvalue equations for the mode-splitting phenomenon of the HE111 mode. We also show that the mode-splitting behavior depends on a single magnetization value of the ferrite. The magnetization and permeability tensor components are computed from the measured resonant frequencies of the resonator. We present an analysis of cylindrical ferrite resonator and its experimental results. |
| 214. | Dong-Hyuk Choi; Seong-Ook Park Active integrated antenna using T‐shaped microstip‐line‐fed slot antenna Journal Article Microwave and Optical Technology Letters, 48 , 2016. Abstract | Links | BibTeX | 태그: International @article{Choi2016, title = {Active integrated antenna using T‐shaped microstip‐line‐fed slot antenna}, author = {Dong-Hyuk Choi and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Choi_et_al-2006-Microwave_and_Optical_Technology_Letters.pdf}, doi = {10.1002/mop.21351}, year = {2016}, date = {2016-02-01}, journal = {Microwave and Optical Technology Letters}, volume = {48}, abstract = {An active integrated antenna (AIA), which consists of a T‐shaped microstrip‐line‐fed slot antenna, is proposed. Since the designed antenna has an electromagnetically coupled feedback loop, it can easily solve the problem of DC isolation between ports of the amplifier. The fabricated parallel feedback antenna oscillator shows stable oscillation at a frequency of 10.05 GHz. The measured EIRP is 37.79 mW, and the cross‐polarization levels are at least −15‐dB lower than those of co‐polarization for all directions.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } An active integrated antenna (AIA), which consists of a T‐shaped microstrip‐line‐fed slot antenna, is proposed. Since the designed antenna has an electromagnetically coupled feedback loop, it can easily solve the problem of DC isolation between ports of the amplifier. The fabricated parallel feedback antenna oscillator shows stable oscillation at a frequency of 10.05 GHz. The measured EIRP is 37.79 mW, and the cross‐polarization levels are at least −15‐dB lower than those of co‐polarization for all directions. |
| 213. | Dong-Uk Sim; Jeong-Ho Ju; Jong-Hwa Kwon; Seong-Ook Park An ultracompact CRLH-TL bandpass filter for VHF applications Journal Article Microwave and Optical Technology Letters, 58 , pp. 694 - 697, 2016. Abstract | Links | BibTeX | 태그: International @article{Sim2016b, title = {An ultracompact CRLH-TL bandpass filter for VHF applications}, author = {Dong-Uk Sim and Jeong-Ho Ju and Jong-Hwa Kwon and Seong-Ook Park}, url = {http://143.248.148.42/wordpress/wp-content/uploads/2018/10/Sim_et_al-2016-Microwave_and_Optical_Technology_Letters.pdf}, doi = {10.1002/mop.29641}, year = {2016}, date = {2016-01-27}, journal = {Microwave and Optical Technology Letters}, volume = {58}, pages = {694 - 697}, abstract = {This article proposes a new design approach to an ultracompact composite right‐/left‐handed transmission line (CRLH‐TL) bandpass filter with good passband and very broad stopband performances. In order to reduce the size, a series connection of the interdigital capacitor and shorted spiral inductor for realizing CRLH‐TL is adopted and optimized to create the target Terrestrial‐Digital Multimedia Broadcasting (T‐DMB, 174–216 MHz) bandpass filtering. T‐DMB was developed in South Korea. The results of a Bloch impedance analysis suggest that the proposed approach generates good impedance matching. The proposed filter has overall dimensions of λg/19 by λg/34 in terms of a center frequency of 180 MHz, a 3 dB fractional bandwidth of over 28%, an insertion loss of much lower than 2 dB, and a good return loss performance in the predicted and measured results.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } This article proposes a new design approach to an ultracompact composite right‐/left‐handed transmission line (CRLH‐TL) bandpass filter with good passband and very broad stopband performances. In order to reduce the size, a series connection of the interdigital capacitor and shorted spiral inductor for realizing CRLH‐TL is adopted and optimized to create the target Terrestrial‐Digital Multimedia Broadcasting (T‐DMB, 174–216 MHz) bandpass filtering. T‐DMB was developed in South Korea. The results of a Bloch impedance analysis suggest that the proposed approach generates good impedance matching. The proposed filter has overall dimensions of λg/19 by λg/34 in terms of a center frequency of 180 MHz, a 3 dB fractional bandwidth of over 28%, an insertion loss of much lower than 2 dB, and a good return loss performance in the predicted and measured results. |
Publications
2018 |
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| 262. | Antenna Gain Enhancement using Double Dielectric Layered Thin Planar Lens Conference 2018 International Symposium on Antennas and Propagation (ISAP), Korea, 2018. |
| 261. | Single Channel Linear Rotary Joint at X-band Conference 2018 International Symposium on Antennas and Propagation (ISAP), Korea, 2018. |
| 260. | Wide-beam Choke Horn Antenna for Small Drone Detection Conference 2018 International Symposium on Antennas and Propagation (ISAP), Korea, 2018. |
| 259. | A Tapered Slot Antenna for Beamforming Application Conference International Symposium on Antennas and Propagation (ISAP 2018) , Korea, 2018. |
| 258. | Analysis of Mode Splitting Behavior for Cylindrical Ferrite Resonator Antenna Conference IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science, U.S., 2018. |
| 257. | A Theoretical Model for Resonant Frequency and Radiation Pattern on Rectangular Microstrip Patch Antenna on Liquid Crystal Substrate Journal Article IEEE Transactions on Antennas and Propagation, 66 , pp. 4533-4540, 2018. |
| 256. | Method for Computing Frequency Response and Radiation Pattern of Magnetized Cylindrical Ferrite Resonator Antenna Journal Article IEEE Transactions on Antennas and Propagation, 66 , pp. 4415 - 4425, 2018. |
| 255. | Development and Validation of New Reverberation Chamber for Wireless Devices Journal Article Wireless Communications and Mobile Computing, pp. 12, 2018. |
| 254. | Experimental Demonstration of Ku-band FMCW Automobilebased SAR in Stripmap Mode Conference European Conference on Synthetic Aperture Radar, Germany, 2018. |
| 253. | Method to reduce an unwanted EM field component in a 4-port TEM cell Journal Article Electronics Letters, 54 , pp. 488 - 490, 2018. |
| 252. | Low‐profile full‐metal‐rimmed antenna with less nonground portion for smartphones Journal Article Microwave and Optical Technology Letters, 60 , pp. 1187 - 1193, 2018. |
| 251. | Ferrite-Cored Patch Antenna With Suppressed Harmonic Radiation Journal Article IEEE Transactions on Antennas and Propagation, 66 , pp. 3154 - 3159, 2018. |
| 250. | Microwave Measurement of Initial Properties of Ferrites Using Mode Splitting Phenomenon by the Rod Resonator Method Journal Article Journal of Electromagnetic Waves and Applications, 32 , pp. 1306 - 1315, 2018. |
2017 |
|
| 249. | Polyphase-Basis Discrete Cosine Transform for Real-Time Measurement of Heart Rate With CW Doppler Radar Journal Article IEEE Transactions on Microwave Theory and Techniques, 66 , pp. 1644 - 1659, 2017. |
| 248. | Experimental Validation for Millimeter-Wave Channel Measurement in Reverberation Chamber Conference International Symposium on Antenna and Propagation, Thailand, 2017. |
| 247. | Configuration of an X-band FMCW Radar Targeted for Drone Detection Conference International Symposium on Antenna and Propagation, Thailand, 2017. |
| 246. | Digital Beamforming Technique with High Resolution Digital Phase Shifter and Digital Phase Calibration using SDR Conference International Symposium on Antenna and Propagation, Thailand, 2017. |
| 245. | A Down-Conversion Method for Attenuation of Leakage Signal in FMCW Radar Conference International Symposium on Antenna and Propagation, Thailand, 2017. |
| 244. | Ku-band Car-borne FMCW Stripmap Synthetic Aperture Radar Journal Article International Symposium on Antenna and Propagation, 2017. |
| 243. | Advanced Measurement Method for evaluation of Microwave Properties using Rectangular Cavity Perturbation Technique Conference IEEE International Symposium on Radio-Frequency Integration Technology, Korea, 2017. |
| 242. | Experimental Analysis of Small Drone Polarimetry Based on Micro-Doppler Signature Journal Article IEEE Geoscience and Remote Sensing Letters, 14 , pp. 1670 - 1674, 2017. |
| 241. | Design of patch loaded with metallic posts inside dielectric resonator antenna Journal Article IET Microwaves, Antennas & Propagation, 11 , pp. 1483 - 1487, 2017. |
| 240. | IEEE Transactions on Antennas and Propagation, 65 , pp. 6669 - 6678, 2017. |
| 239. | Modified Range Doppler Algorithm for FMCW Auto SAR Conference Asian Workshop on Antennas and Propagation, Japan, 2017. |
| 238. | Mitigation of Leakage in FMCW Radar with Simple Metal Baffle Structure Conference International Symposium on Microwave and Optical Technology, Korea, 2017. |
| 237. | Advanced Cavity Perturbation Method for Continuous Measurement of Microwave Properties Conference International Symposium on Microwave and Optical Technology, Korea, 2017. |
| 236. | Microwave Measurement of Initial Properties of Ferrites using Mode Splitting Phenomenon by the Rod Resonator Method Conference Intenational Conference on the Computation of Electromagnetic Fields, Korea, 2017. |
| 235. | Drone-Based External Calibration of a Fully Synchronized Ku-Band Heterodyne FMCW Radar Journal Article IEEE Transactions on Instrumentation and Measurement, 66 , pp. 2189 - 2197, 2017. |
| 234. | Novel theoretical model of mode splitting behavior of cylindrical ferrite resonator antenna Conference IEEE International Conference on Computational Electromagnetics, Japan, 2017. |
| 233. | A Simple Wireless Power Charging Antenna System: Evaluation of Ferrite Sheet Journal Article IEEE Transactions on Magnetics, 53 , 2017. |
| 232. | A Theoretical Model for Frequency Response of a Cylindrical Resonator Antenna With the H E-11 delta Mode Splitting Behavior Journal Article IEEE Transactions on Antennas and Propagation, 65 , pp. 1615 - 1623, 2017. |
2016 |
|
| 231. | Design of multiband electromagnetic wave absorber based on a periodic surface for electromagnetic wave measurement facility applications Journal Article Microwave and Optical Technology Letters, 59 , pp. 478 - 481, 2016. |
| 230. | Characteristics Calculation of Ferrite Material Using Frequency Tunable Resonator Journal Article IEEE Transactions on Magnetics, 53 , 2016. |
| 229. | A Distributed FMCW Radar System Based on Fiber-Optic Links for Small Drone Detection Journal Article IEEE Transactions on Instrumentation and Measurement, 66 , pp. 340 - 347, 2016. |
| 228. | Mushroom meta-material based substrate integrated waveguide cavity backed slot antenna with broadband and reduced back radiation Journal Article IET Microwaves, Antennas & Propagation, 10 , pp. 1598 - 1603, 2016. |
| 227. | Drone Classification Using Convolutional Neural Networks With Merged Doppler Images Journal Article IEEE Geoscience and Remote Sensing Letters, 14 , pp. 38 - 42, 2016. |
| 226. | Theory and Design of a Cylindrical Ferrite Resonator Antenna Using HE11 delta Mode Splitting Behavior Journal Article IEEE Transactions on Antennas and Propagation, 64 , pp. 5547 - 5552, 2016. |
| 225. | Analysis of low loss magneto-dielectric antenna for the mobile communication Conference International Symposium on Antenna and Propagation, Japan, 2016. |
| 224. | Effect of Electromagnetic Interference on Human Body Communication Journal Article IEEE Transactions on Electromagnetic Compatibility, 59 , pp. 48 - 57, 2016. |
| 223. | Measurement and Analysis of Weather Phenomena with K-Band Rain Radar Conference URSI Asia-Pacific Radio Science Conference, Korea, 2016. |
| 222. | Circularly Polarized Substrate-Integrated-Waveguide Antenna Array for Millimeter-Wave Handset Device Conference URSI Asia-Pacific Radio Science Conference, Korea, 2016. |
| 221. | Analysis of the Adavanced Cavity Perturbation Method for Microwave Properties Conference URSI Asia-Pacific Radio Science Conference, Korea, 2016. |
| 220. | Measuremet of Properties of Ferrites at Partially Magnetized State using Cylindrical Resonator Conference URSI Asia-Pacific Radio Science Conference, Korea, 2016. |
| 219. | LHCP and RHCP Substrate Integrated Waveguide Antenna Arrays for Millimeter-Wave Applications Journal Article IEEE Antennas and Wireless Propagation Letters, 16 , pp. 601 - 604, 2016. |
| 218. | Bit error rate degradation model for time-delay parameter of co-channel interference occurring in human body communication Journal Article IET Communications, 10 , pp. 724 - 733, 2016. |
| 217. | Multiband Full-Metal-Rimmed Antenna Design for Smartphones Journal Article IEEE Antennas and Wireless Propagation Letters, 15 , pp. 1987 - 1990, 2016. |
| 216. | Design and initial measurements of K-band FMCW rain radar with high resolution Journal Article Microwave and Optical Technology Letters, 58 , pp. 817 - 822, 2016. |
| 215. | Calculation of Magnetization and Permeability Tensor of a Partially Magnetized Cylindrical Ferrite Resonator Journal Article IEEE Magnetics Letters, 7 , 2016. |
| 214. | Active integrated antenna using T‐shaped microstip‐line‐fed slot antenna Journal Article Microwave and Optical Technology Letters, 48 , 2016. |
| 213. | An ultracompact CRLH-TL bandpass filter for VHF applications Journal Article Microwave and Optical Technology Letters, 58 , pp. 694 - 697, 2016. |