Publications

447 entries « ‹ 1 of 9 › »

2025
447.	Young-Geun Kang; Seungwoon Park; Eunsung Kim; Jinuk Lee; Kyeongrok Kim; Sangtae Kim; Seong-Ook Park Ground-Moving Target Indication Using Along Track SAR Interferometer Designed with Triangular Frequency-Modulated Continuous Wave Radar Journal Article IEEE Transactions on Instrumentation and Measurement, n (n), pp. 1-1, 2025, ISSN: 1557-9662. Abstract \| Links \| BibTeX \| 태그: International @article{Kang2025, title = {Ground-Moving Target Indication Using Along Track SAR Interferometer Designed with Triangular Frequency-Modulated Continuous Wave Radar}, author = {Young-Geun Kang and Seungwoon Park and Eunsung Kim and Jinuk Lee and Kyeongrok Kim and Sangtae Kim and Seong-Ook Park }, url = {http://ma.kaist.ac.kr/wp-content/uploads/2025/03/Ground-Moving_Target_Indication_Using_Along-Track_SAR_Interferometer_Designed_With_Triangular_Frequency-Modulated_Continuous_Wave_Radar.pdf}, doi = {10.1109/TIM.2025.3541704}, issn = {1557-9662}, year = {2025}, date = {2025-02-13}, journal = {IEEE Transactions on Instrumentation and Measurement}, volume = {n}, number = {n}, pages = {1-1}, abstract = {Synthetic aperture radar-ground-moving target indication (SAR-GMTI) system generates two-dimensional images of the observed area and detects moving targets within the image. Along track SAR interferometry (ATI) is gaining attention as a useful GMTI technique because it not only detects moving objects but also estimates the radial velocities of the detected objects. To unambiguously estimate the velocities of the moving objects with an ATI system, implementing a multi-baseline system with multi-channel is required, and frequency-modulated continuous wave (FMCW) radars are appropriate for multi-channel implementation due to their inherent bistatic properties. This paper proposes a practical and efficient SAR-GMTI design method that implements an ATI system with a triangular FMCW radar. The system is lightweight and affordable because it only requires a single FMCW radar. In addition, by adopting a triangular transmission signal model, the proposed system achieves the ability to distinguish signals for two channels in a single receiver. The usefulness of the proposed technique will be emphasized through comparison with the existing SAR-GMTI method using FMCW radars. Furthermore, the GMTI field test results using a van as a SAR platform are presented to demonstrate the validity of the proposed system. The experiment results of detecting multiple objects moving at various velocities validate the practicality of the proposed system. A method to verify the accuracy of the estimated velocities is also given.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close Synthetic aperture radar-ground-moving target indication (SAR-GMTI) system generates two-dimensional images of the observed area and detects moving targets within the image. Along track SAR interferometry (ATI) is gaining attention as a useful GMTI technique because it not only detects moving objects but also estimates the radial velocities of the detected objects. To unambiguously estimate the velocities of the moving objects with an ATI system, implementing a multi-baseline system with multi-channel is required, and frequency-modulated continuous wave (FMCW) radars are appropriate for multi-channel implementation due to their inherent bistatic properties. This paper proposes a practical and efficient SAR-GMTI design method that implements an ATI system with a triangular FMCW radar. The system is lightweight and affordable because it only requires a single FMCW radar. In addition, by adopting a triangular transmission signal model, the proposed system achieves the ability to distinguish signals for two channels in a single receiver. The usefulness of the proposed technique will be emphasized through comparison with the existing SAR-GMTI method using FMCW radars. Furthermore, the GMTI field test results using a van as a SAR platform are presented to demonstrate the validity of the proposed system. The experiment results of detecting multiple objects moving at various velocities validate the practicality of the proposed system. A method to verify the accuracy of the estimated velocities is also given. Close http://ma.kaist.ac.kr/wp-content/uploads/2025/03/Ground-Moving_Target_Indication[...] doi:10.1109/TIM.2025.3541704 Close
446.	Youngin Yoo; Jinki Park; Changjae Lee; Dongki Yoon; Seong Ook Park Reconfigurable Multibeam Holographic Antenna Based on Liquid-Crystal Technology for Ka-Band LEO Satellite Application Journal Article IEEE Access, 13 , pp. 27141-27149, 2025, ISSN: 2169-3536. Abstract \| Links \| BibTeX \| 태그: International @article{Yoo2025, title = {Reconfigurable Multibeam Holographic Antenna Based on Liquid-Crystal Technology for Ka-Band LEO Satellite Application}, author = {Youngin Yoo and Jinki Park and Changjae Lee and Dongki Yoon and Seong Ook Park}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2025/02/Reconfigurable_Multibeam_Holographic_Antenna_Based_on_Liquid-Crystal_Technology_for_Ka-Band_LEO_Satellite_Application.pdf}, doi = {10.1109/ACCESS.2025.3538044}, issn = {2169-3536}, year = {2025}, date = {2025-02-03}, journal = {IEEE Access}, volume = {13}, pages = {27141-27149}, abstract = {The requirements of low Earth orbit (LEO) satellite systems for high-precision and selective multiple coverage, have driven much interest and demand for millimeter-wave multibeam antennas. However, the key challenge is to provide fully independent control of each beam with a single source, and metasurfaces have paved the way to solve this problem. Here, we present a reconfigurable multibeam holographic antenna (HA) at 36 GHz. In particular, we used liquid crystals (LC) to implement a low power consumption and lightweight antenna. Each unit cell is selectively driven by connected bias lines according to the calculated holographic pattern. Consequently, the proposed multibeam HA can radiate in the desired direction and control each beam independently. Furthermore, the gain difference in each beam can be corrected by the amplitude coefficient to radiate with nearly equal gain in each direction. The proposed HA demonstrated the scanning range of 60° at 36 GHz, with a peak gain of 8.7 dBi. Additionally, the peak directivity is 12.7 dBi, the 3-dB bandwidth is about 1 GHz at the center frequency of 36 GHz, and the operating bandwidth is 2.8 GHz ( 34.8−37.6 GHz).}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close The requirements of low Earth orbit (LEO) satellite systems for high-precision and selective multiple coverage, have driven much interest and demand for millimeter-wave multibeam antennas. However, the key challenge is to provide fully independent control of each beam with a single source, and metasurfaces have paved the way to solve this problem. Here, we present a reconfigurable multibeam holographic antenna (HA) at 36 GHz. In particular, we used liquid crystals (LC) to implement a low power consumption and lightweight antenna. Each unit cell is selectively driven by connected bias lines according to the calculated holographic pattern. Consequently, the proposed multibeam HA can radiate in the desired direction and control each beam independently. Furthermore, the gain difference in each beam can be corrected by the amplitude coefficient to radiate with nearly equal gain in each direction. The proposed HA demonstrated the scanning range of 60° at 36 GHz, with a peak gain of 8.7 dBi. Additionally, the peak directivity is 12.7 dBi, the 3-dB bandwidth is about 1 GHz at the center frequency of 36 GHz, and the operating bandwidth is 2.8 GHz ( 34.8−37.6 GHz). Close http://ma.kaist.ac.kr/wp-content/uploads/2025/02/Reconfigurable_Multibeam_Hologr[...] doi:10.1109/ACCESS.2025.3538044 Close
2024
445.	Kyung-Bin Bae; Youngin Yoo; Seungwoon Park; SeongOok Park A Novel Channel Sounding Method Based on Pulsed LFM Signal for mm-Wave Application Instrumentation Measurement and Analysis Journal Article IEEE Transactions on Instrumentation and Measurement, 74 (8501216), 2024, ISSN: 1557-9662. Abstract \| Links \| BibTeX \| 태그: International @article{Bae2024, title = {A Novel Channel Sounding Method Based on Pulsed LFM Signal for mm-Wave Application Instrumentation Measurement and Analysis}, author = {Kyung-Bin Bae and Youngin Yoo and Seungwoon Park and SeongOok Park}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2025/02/A_Novel_Channel_Sounding_Method_Based_on_Pulsed_LFM_Signal_for_mm-Wave_Application_Instrumentation_Measurement_and_Analysis-1.pdf}, doi = {10.1109/TIM.2024.3522635}, issn = {1557-9662}, year = {2024}, date = {2024-12-25}, journal = {IEEE Transactions on Instrumentation and Measurement}, volume = {74}, number = {8501216}, abstract = {Recently, there has been increasing demand to exploit a wider spectrum in higher frequency bands to improve the performance of new wireless communication devices and systems for millimeter-wave (mm-Wave) communications and fifth-generation (5G) mobile networks. Channel measurement and modeling are crucial for the design and development of such 5G devices and systems. In general, among various channel sounding methods, the most appropriate method has been selectively used depending on the channel characteristics to be measured. In this article, we propose an advanced sounding technique based on linear frequency modulation (LFM) pulse signal to strengthen channel sounding capabilities fitting well in higher frequency bands. The unique property of the LFM signal, where the instant frequency change corresponds to the sweep time, ensures that the output of the proposed channel sounder is proportional to the scattering parameter. Using this, we present an extended capability of the proposed sounding technique to measure channel characteristics such as delay spread, Doppler spread (DS), and Rician-K factor of small-scale fading channels emulated in a reverberation chamber (RC).}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close Recently, there has been increasing demand to exploit a wider spectrum in higher frequency bands to improve the performance of new wireless communication devices and systems for millimeter-wave (mm-Wave) communications and fifth-generation (5G) mobile networks. Channel measurement and modeling are crucial for the design and development of such 5G devices and systems. In general, among various channel sounding methods, the most appropriate method has been selectively used depending on the channel characteristics to be measured. In this article, we propose an advanced sounding technique based on linear frequency modulation (LFM) pulse signal to strengthen channel sounding capabilities fitting well in higher frequency bands. The unique property of the LFM signal, where the instant frequency change corresponds to the sweep time, ensures that the output of the proposed channel sounder is proportional to the scattering parameter. Using this, we present an extended capability of the proposed sounding technique to measure channel characteristics such as delay spread, Doppler spread (DS), and Rician-K factor of small-scale fading channels emulated in a reverberation chamber (RC). Close http://ma.kaist.ac.kr/wp-content/uploads/2025/02/A_Novel_Channel_Sounding_Method[...] doi:10.1109/TIM.2024.3522635 Close
444.	Han-Sol Kim; Eunsung Kim; JuHong Park; Changyu Lee; Yoo-Ho Jang; Seong-Ook Park AI 알고리즘을 활용한 4-D 레이다 신호 처리 방법에 대한 연구 Conference 2024년 한국전자파학회 하계종합학술대회, 2024. BibTeX \| 태그: Domestic @conference{Kim2024b, title = {AI 알고리즘을 활용한 4-D 레이다 신호 처리 방법에 대한 연구}, author = {Han-Sol Kim and Eunsung Kim and JuHong Park and Changyu Lee and Yoo-Ho Jang and Seong-Ook Park}, year = {2024}, date = {2024-08-21}, booktitle = {2024년 한국전자파학회 하계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
443.	Han-Sol Kim; Seong-Ook Park 소형 FMCW 레이다 누출 완화를 위한 위상 동기화 차감 방법 Conference 2024년 한국전자파학회 하계종합학술대회, 2024. BibTeX \| 태그: Domestic @conference{Kim2024c, title = {소형 FMCW 레이다 누출 완화를 위한 위상 동기화 차감 방법}, author = {Han-Sol Kim and Seong-Ook Park}, year = {2024}, date = {2024-08-21}, booktitle = {2024년 한국전자파학회 하계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
442.	Jinki Park; Youngin Yoo; Changjae Lee; Dong Ki Yoon; Seong-Ook Park Liquid-Crystal-Based Beam Steering Guided-Wave Metasurface Antenna at Millimeter-Wave Band Journal Article IEEE Antennas and Wireless Propagation Letters, 2024. Abstract \| Links \| BibTeX \| 태그: International @article{Park2024, title = {Liquid-Crystal-Based Beam Steering Guided-Wave Metasurface Antenna at Millimeter-Wave Band}, author = {Jinki Park and Youngin Yoo and Changjae Lee and Dong Ki Yoon and Seong-Ook Park}, doi = {10.1109/LAWP.2024.3439587}, year = {2024}, date = {2024-08-06}, journal = {IEEE Antennas and Wireless Propagation Letters}, abstract = {In this paper, we present the design and fabrication of a liquid crystal (LC)-based metasurface antenna for millimeter-wave beam steering applications. Unlike the conventional beamforming systems that rely on phase shifters, our approach harnesses the electrical tunability of LCs. We target a frequency of 34.5 GHz, taking advantage of the pronounced low dielectric loss characteristics exhibited by LCs. The proposed antenna uses a substrate integrated waveguides (SIW) to feed millimeter-wave to metasurface unit cells, and each cell’s radiation is controlled through DC voltage biasing of the LC. The measurement results demonstrate a beam steering range of 120° with a maximum gain of 10.754 dBi and a sidelobe level (SLL) of -11.562 dBc at the boresight.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close In this paper, we present the design and fabrication of a liquid crystal (LC)-based metasurface antenna for millimeter-wave beam steering applications. Unlike the conventional beamforming systems that rely on phase shifters, our approach harnesses the electrical tunability of LCs. We target a frequency of 34.5 GHz, taking advantage of the pronounced low dielectric loss characteristics exhibited by LCs. The proposed antenna uses a substrate integrated waveguides (SIW) to feed millimeter-wave to metasurface unit cells, and each cell’s radiation is controlled through DC voltage biasing of the LC. The measurement results demonstrate a beam steering range of 120° with a maximum gain of 10.754 dBi and a sidelobe level (SLL) of -11.562 dBc at the boresight. Close doi:10.1109/LAWP.2024.3439587 Close
441.	Jing Huang; Seung-Joo Jo; Chang-Won Seo; Si-A Lee; Seong-Sik Yoon; Seong-Ook Park Electrical Performance Analysis and Prediction for Complex Mesh based on Model Angles Journal Article IEEE Access, 2024. Abstract \| Links \| BibTeX \| 태그: International @article{Huang2024, title = {Electrical Performance Analysis and Prediction for Complex Mesh based on Model Angles}, author = {Jing Huang and Seung-Joo Jo and Chang-Won Seo and Si-A Lee and Seong-Sik Yoon and Seong-Ook Park}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2024/08/Electrical_Performance_Analysis_and_Prediction_for_Complex_Mesh_based_on_Model_Angles.pdf}, doi = {10.1109/ACCESS.2024.3431037}, year = {2024}, date = {2024-07-19}, journal = {IEEE Access}, abstract = {The metallic mesh serves as a reflecting surface on deployable reflector antennas for satellites. Electrical properties differ for meshes with different knitting patterns. Also, pattern shapes vary at different tensions due to the elasticity of the mesh. Furthermore, mesh models for electrical performance analysis become more challenging to construct as the mesh knitting patterns become more intricate. A method based on model angles and diagonals is developed in this paper to overcome the aforementioned problems. First, procedures for building a mesh model are described. Then three mesh models of the single Atlas mesh, the single Satin mesh, and the Max mesh are built. The corresponding performance variations are observed and stabilities are compared. Moreover, the wire diameter for the mesh model is determined by measuring the reflectance of the Max mesh and comparing it with simulation results. Afterward, correlations between the reflectivity and incident angles are presented. In addition, the reflectance and transmittance at different incidence angles are measured. Measured results align well with simulated results. It verifies the accuracy of the simulated characteristics and the value of the mesh model in understanding mesh electrical properties.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close The metallic mesh serves as a reflecting surface on deployable reflector antennas for satellites. Electrical properties differ for meshes with different knitting patterns. Also, pattern shapes vary at different tensions due to the elasticity of the mesh. Furthermore, mesh models for electrical performance analysis become more challenging to construct as the mesh knitting patterns become more intricate. A method based on model angles and diagonals is developed in this paper to overcome the aforementioned problems. First, procedures for building a mesh model are described. Then three mesh models of the single Atlas mesh, the single Satin mesh, and the Max mesh are built. The corresponding performance variations are observed and stabilities are compared. Moreover, the wire diameter for the mesh model is determined by measuring the reflectance of the Max mesh and comparing it with simulation results. Afterward, correlations between the reflectivity and incident angles are presented. In addition, the reflectance and transmittance at different incidence angles are measured. Measured results align well with simulated results. It verifies the accuracy of the simulated characteristics and the value of the mesh model in understanding mesh electrical properties. Close http://ma.kaist.ac.kr/wp-content/uploads/2024/08/Electrical_Performance_Analysis[...] doi:10.1109/ACCESS.2024.3431037 Close
440.	Han-Sol Kim; Jiyeol Meang; Ju-Hye Kim; Dong-Sik Ko; Seong-Ho Seo; Muhammad Tayyab Azim; Seong-Ook Park Miniaturized 24GHz FMCW Radar Leakage Mitigation with Synchronized Subtraction Journal Article IEEE Sensors Journal, 2024. Abstract \| Links \| BibTeX \| 태그: International @article{Kim2024, title = {Miniaturized 24GHz FMCW Radar Leakage Mitigation with Synchronized Subtraction}, author = {Han-Sol Kim and Jiyeol Meang and Ju-Hye Kim and Dong-Sik Ko and Seong-Ho Seo and Muhammad Tayyab Azim and Seong-Ook Park}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2024/08/Miniaturized_24GHz_FMCW_Radar_Leakage_Mitigation_with_Synchronized_Subtraction-압축됨.pdf}, doi = {10.1109/JSEN.2024.3422397}, year = {2024}, date = {2024-07-11}, journal = {IEEE Sensors Journal}, abstract = {Frequency-modulated continuous wave (FMCW) radar sensors are widely used to measure range, velocity, and target status. As the range of applications for FMCW radar sensors expands, there is an increasing demand for smaller FMCW radar sensors suitable for use in confined spaces. To reduce the form factor of the FMCW radar sensor, the distance between the transmit (Tx) and receive (Rx) antennas is also reduced. This decrease in antenna separation increases the magnitude of the leakage signal transmitted from the Tx to the Rx antenna. However, the leakage signal makes it difficult for the FMCW radar sensor to detect the target by increasing the noise floor. In this article, we present an advanced method to mitigate the increased leakage signal power in the miniaturized FMCW radar sensor. We have fabricated a miniaturized homodyne FMCW radar with consistent leakage signal characteristics. We also propose a method to minimize the influence of the leakage signal by storing the leakage signal characteristics and using the stored data when operating the radar. Experimental results show significant leakage signal power reduction. This technique not only preserves the power of the received target signals but also improves the overall performance of compact FMCW radar sensors. The proposed method provides a basis for miniaturized radar sensors to contribute to various industries by providing an effective solution to the leakage signal problem of small radar technology.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close Frequency-modulated continuous wave (FMCW) radar sensors are widely used to measure range, velocity, and target status. As the range of applications for FMCW radar sensors expands, there is an increasing demand for smaller FMCW radar sensors suitable for use in confined spaces. To reduce the form factor of the FMCW radar sensor, the distance between the transmit (Tx) and receive (Rx) antennas is also reduced. This decrease in antenna separation increases the magnitude of the leakage signal transmitted from the Tx to the Rx antenna. However, the leakage signal makes it difficult for the FMCW radar sensor to detect the target by increasing the noise floor. In this article, we present an advanced method to mitigate the increased leakage signal power in the miniaturized FMCW radar sensor. We have fabricated a miniaturized homodyne FMCW radar with consistent leakage signal characteristics. We also propose a method to minimize the influence of the leakage signal by storing the leakage signal characteristics and using the stored data when operating the radar. Experimental results show significant leakage signal power reduction. This technique not only preserves the power of the received target signals but also improves the overall performance of compact FMCW radar sensors. The proposed method provides a basis for miniaturized radar sensors to contribute to various industries by providing an effective solution to the leakage signal problem of small radar technology. Close http://ma.kaist.ac.kr/wp-content/uploads/2024/08/Miniaturized_24GHz_FMCW_Radar_L[...] doi:10.1109/JSEN.2024.3422397 Close
439.	Seong-Ook Park SAR 위성 RAW영상 압축 전송기술 및 군 적용방안 Conference 2024년 한국전자파학회 동계종합학술대회, 2024. BibTeX \| 태그: Domestic @conference{Park2024b, title = {SAR 위성 RAW영상 압축 전송기술 및 군 적용방안}, author = {Seong-Ook Park}, year = {2024}, date = {2024-02-14}, booktitle = {2024년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
438.	JuHong Park; Jaekyung Lee; Taewon Kim; Seong-Ook Park 변전소 환경에서 무인 이동체 탐지에 대한 분석 Conference 2024년 한국전자파학회 동계종합학술대회, 2024. BibTeX \| 태그: Domestic @conference{Park2024c, title = {변전소 환경에서 무인 이동체 탐지에 대한 분석}, author = {JuHong Park and Jaekyung Lee and Taewon Kim and Seong-Ook Park}, year = {2024}, date = {2024-02-14}, booktitle = {2024년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
437.	Changjae Lee; Jinki Park; Ye-Eun Chi; Youngin Yoo; Seong-Ook Park; Dong Ki Yoon Ultralow-Voltage Frequency Tunning of Liquid Crystal-Based GHz Antenna via Nanoscratching Method Journal Article Advanced Materials Technologies, 9 (7), pp. 2301859, 2024. Abstract \| Links \| BibTeX \| 태그: International @article{Lee2024, title = {Ultralow-Voltage Frequency Tunning of Liquid Crystal-Based GHz Antenna via Nanoscratching Method}, author = {Changjae Lee and Jinki Park and Ye-Eun Chi and Youngin Yoo and Seong-Ook Park and Dong Ki Yoon}, doi = {10.1002/admt.202301859}, year = {2024}, date = {2024-02-12}, journal = {Advanced Materials Technologies}, volume = {9}, number = {7}, pages = {2301859}, abstract = {Liquid crystal (LC)-based radio-frequency (RF) tunable antennas garner attention because of their compact size and minimal heat generation. Exploiting the LC's property to alter the RF permittivity depending on its alignment, voltage-induced orientational switching enables frequency modulation of the radiated wave. To ensure dependable antenna performance, precise control of the initial LC alignment is crucial, which is conventionally achieved by polyimide (PI) coating followed by the rubbing process (PI-rubbing). However, this approach demands high temperature (200 °C) and prolonged processing time (2 h), while also necessitating high voltage for LC reorientation due to induced excessive surface polar anchoring strength. Here, a PI-free-nanoscratching method creating 1D channels is introduced that induces initial LC alignment in a desired direction. The initial orienting capability of the scratched metal surface is superior to that of the PI-rubbed surface. Furthermore, the LC-based antenna employing the nanoscratching method shows a remarkable resonance frequency shift of up to 3 GHz with a low voltage of 2 V. This driving voltage is five times lower than that of antennas using the conventional PI-rubbing method, which can open a new era for the next generation LC-antenna.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close Liquid crystal (LC)-based radio-frequency (RF) tunable antennas garner attention because of their compact size and minimal heat generation. Exploiting the LC's property to alter the RF permittivity depending on its alignment, voltage-induced orientational switching enables frequency modulation of the radiated wave. To ensure dependable antenna performance, precise control of the initial LC alignment is crucial, which is conventionally achieved by polyimide (PI) coating followed by the rubbing process (PI-rubbing). However, this approach demands high temperature (200 °C) and prolonged processing time (2 h), while also necessitating high voltage for LC reorientation due to induced excessive surface polar anchoring strength. Here, a PI-free-nanoscratching method creating 1D channels is introduced that induces initial LC alignment in a desired direction. The initial orienting capability of the scratched metal surface is superior to that of the PI-rubbed surface. Furthermore, the LC-based antenna employing the nanoscratching method shows a remarkable resonance frequency shift of up to 3 GHz with a low voltage of 2 V. This driving voltage is five times lower than that of antennas using the conventional PI-rubbing method, which can open a new era for the next generation LC-antenna. Close doi:10.1002/admt.202301859 Close
436.	Myoung-Ho Chae; Seong-Ook Park; Seung-Ho Choi; Chae-Taek Choi Reinforcement Learning-Based Counter Fixed-Wing Drone System Using GNSS Deception Journal Article IEEE Access, 12 , pp. 16549 - 16558, 2024. Abstract \| Links \| BibTeX \| 태그: International @article{Chae2024, title = {Reinforcement Learning-Based Counter Fixed-Wing Drone System Using GNSS Deception}, author = {Myoung-Ho Chae and Seong-Ook Park and Seung-Ho Choi and Chae-Taek Choi}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2024/08/Reinforcement_Learning-Based_Counter_Fixed-Wing_Drone_System_Using_GNSS_Deception-2-압축됨.pdf}, doi = {10.1109/ACCESS.2024.3358211}, year = {2024}, date = {2024-01-24}, journal = {IEEE Access}, volume = {12}, pages = {16549 - 16558}, abstract = {As drone intrusions into important facilities have increased, research on drone countermeasures has been conducted to counter drones. In this study, we developed a reinforcement learning (RL)-based counter fixed-wing drone system that can respond to fixed-wing drones in autonomous flight with soft kills. The system redirects fixed-wing drones to a designated target position using the global navigation satellite system (GNSS) deception based on the drone’s position and speed measured by RADAR. In this study, to construct an environment for training an RL agent, simplified drone modeling was performed for two types of fixed wing drones, and the RADAR error measured through flight tests was modeled. Subsequently, the Markov decision process (MDP) was defined to enable redirection without prior information regarding fixed-wing drones. After applying the RL agent trained in the defined MDP and environment to the counter fixed-wing drone system, the simulation and flight test results confirmed that redirection was possible for both types of fixed-wing drones.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close As drone intrusions into important facilities have increased, research on drone countermeasures has been conducted to counter drones. In this study, we developed a reinforcement learning (RL)-based counter fixed-wing drone system that can respond to fixed-wing drones in autonomous flight with soft kills. The system redirects fixed-wing drones to a designated target position using the global navigation satellite system (GNSS) deception based on the drone’s position and speed measured by RADAR. In this study, to construct an environment for training an RL agent, simplified drone modeling was performed for two types of fixed wing drones, and the RADAR error measured through flight tests was modeled. Subsequently, the Markov decision process (MDP) was defined to enable redirection without prior information regarding fixed-wing drones. After applying the RL agent trained in the defined MDP and environment to the counter fixed-wing drone system, the simulation and flight test results confirmed that redirection was possible for both types of fixed-wing drones. Close http://ma.kaist.ac.kr/wp-content/uploads/2024/08/Reinforcement_Learning-Based_Co[...] doi:10.1109/ACCESS.2024.3358211 Close
2023
435.	Kyung-Bin Bae; Seungwook Lee; Seong-Ook Park 비허가 소형 무인이동체 재밍을 위한 드론 탑재형 재밍 시스템 개발 및 실증 Conference 2023년 한국전자파학회 추계학술대회, 2023. BibTeX \| 태그: Domestic @conference{Bae2023c, title = {비허가 소형 무인이동체 재밍을 위한 드론 탑재형 재밍 시스템 개발 및 실증}, author = {Kyung-Bin Bae and Seungwook Lee and Seong-Ook Park}, year = {2023}, date = {2023-11-23}, booktitle = {2023년 한국전자파학회 추계학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
434.	Young-Geun Kang; Seong-Ook Park A Full-Aperture Frequency Scaling Algorithm for Processing Dechirped Sliding Spotlight SAR Data Journal Article IEEE Access, 11 , pp. 92550-92564, 2023. Abstract \| Links \| BibTeX \| 태그: International @article{Kang2023b, title = {A Full-Aperture Frequency Scaling Algorithm for Processing Dechirped Sliding Spotlight SAR Data}, author = {Young-Geun Kang and Seong-Ook Park}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2023/09/A-Full-Aperture-Frequency-Scaling-Algorithm-for-Processing-Dechirped-Sliding-Spotlight-SAR-Data.pdf}, doi = {10.1109/ACCESS.2023.3308906}, year = {2023}, date = {2023-08-28}, journal = {IEEE Access}, volume = {11}, pages = {92550-92564}, abstract = {This paper proposes a full-aperture method for processing sliding spotlight synthetic aperture radar (SAR) data with dechirp-on-receive. The frequency scaling algorithm (FSA) efficiently processes the dechirped signals because the range cell migration correction (RCMC) process involves removing the residual video phase. However, the conventional FSA combined with the sub-aperture method is unsuitable for processing sliding mode data because the azimuth extent of the SAR image is limited by the system pulse repetition frequency. In addition, the azimuth compression performance deteriorates as the range displacement increases from the center of the SAR image. To address these problems, we developed a modified full-aperture FSA for sliding mode data processing. A complete signal model of the azimuth convoluted sliding mode data with the dechirp-on-receive is newly derived. Based on the signal model, the frequency scaling factor and azimuth-matched filter have been modified to accurately perform RCMC and azimuth compression. Point target simulations demonstrated two advantages of the proposed algorithm over the conventional sub-aperture approach; One is accurate and consistent azimuth compression performance regardless of range displacements, and the other is wide observable azimuth extent. The practicality of the proposed method is further verified through actual SAR raw data experiments. In addition, it is analyzed that the proposed algorithm is specialized in processing dechirped sliding mode data through a characteristic comparison with various traditional sliding spotlight processing methods.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close This paper proposes a full-aperture method for processing sliding spotlight synthetic aperture radar (SAR) data with dechirp-on-receive. The frequency scaling algorithm (FSA) efficiently processes the dechirped signals because the range cell migration correction (RCMC) process involves removing the residual video phase. However, the conventional FSA combined with the sub-aperture method is unsuitable for processing sliding mode data because the azimuth extent of the SAR image is limited by the system pulse repetition frequency. In addition, the azimuth compression performance deteriorates as the range displacement increases from the center of the SAR image. To address these problems, we developed a modified full-aperture FSA for sliding mode data processing. A complete signal model of the azimuth convoluted sliding mode data with the dechirp-on-receive is newly derived. Based on the signal model, the frequency scaling factor and azimuth-matched filter have been modified to accurately perform RCMC and azimuth compression. Point target simulations demonstrated two advantages of the proposed algorithm over the conventional sub-aperture approach; One is accurate and consistent azimuth compression performance regardless of range displacements, and the other is wide observable azimuth extent. The practicality of the proposed method is further verified through actual SAR raw data experiments. In addition, it is analyzed that the proposed algorithm is specialized in processing dechirped sliding mode data through a characteristic comparison with various traditional sliding spotlight processing methods. Close http://ma.kaist.ac.kr/wp-content/uploads/2023/09/A-Full-Aperture-Frequency-Scali[...] doi:10.1109/ACCESS.2023.3308906 Close
433.	Youngin Yoo; Jinki Park; Seong-Ook Park Ka 대역용 이득이 증가된 가변형 액정기반 누설파 홀로그래픽 안테나 Conference 2023년 한국전자파학회 하계종합학술대회, 2023. BibTeX \| 태그: Domestic @conference{Yoo2023, title = {Ka 대역용 이득이 증가된 가변형 액정기반 누설파 홀로그래픽 안테나}, author = {Youngin Yoo and Jinki Park and Seong-Ook Park}, year = {2023}, date = {2023-08-23}, booktitle = {2023년 한국전자파학회 하계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
432.	Kyung-Bin Bae; Jinuk Lee; Seong-Ook Park 소형 드론 재밍을 위한 초경량 다중 대역 재밍시스템 Conference 2023년 한국전자파학회 하계종합학술대회, 2023. BibTeX \| 태그: Domestic @conference{Bae2023b, title = {소형 드론 재밍을 위한 초경량 다중 대역 재밍시스템}, author = {Kyung-Bin Bae and Jinuk Lee and Seong-Ook Park}, year = {2023}, date = {2023-08-23}, booktitle = {2023년 한국전자파학회 하계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
431.	Young-Geun Kang; Seungwoon Park; Eunsung Kim; Kyeongrok Kim; Seong-Ook Park Multichannel Along-Track Interferometric SAR System Implementation Using FMCW Radar Journal Article IEEE Geoscience and Remote Sensing Letters, 20 , pp. 4009405, 2023. Abstract \| Links \| BibTeX \| 태그: International @article{Kang2023, title = {Multichannel Along-Track Interferometric SAR System Implementation Using FMCW Radar}, author = {Young-Geun Kang and Seungwoon Park and Eunsung Kim and Kyeongrok Kim and Seong-Ook Park}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2023/09/Multichannel-Along-Track-Interferometric-SAR-System-Implementation-Using-FMCW-Radar.pdf}, doi = {10.1109/LGRS.2023.3307187}, year = {2023}, date = {2023-08-21}, journal = {IEEE Geoscience and Remote Sensing Letters}, volume = {20}, pages = {4009405}, abstract = {Along-track synthetic aperture radar interferometry (ATI) systems are used to detect a moving target and to estimate its radial velocity. A dual-channel (single-baseline) ATI system estimates the velocity ambiguously because there are many candidate velocities corresponding to the interferometric phase. To resolve the ambiguity of the estimates, a multichannel (multibaseline) ATI system is required. This letter proposes an efficient implementation technique of a multichannel ATI system by using a frequency-modulated continuous wave (FMCW) radar and an antenna arrangement method considering the inherent bi-static characteristic of FMCW radars. Also, a simple and robust radial velocity estimation algorithm suitable for the proposed system model is presented. The validity of the algorithm is confirmed with simulated ATI results.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close Along-track synthetic aperture radar interferometry (ATI) systems are used to detect a moving target and to estimate its radial velocity. A dual-channel (single-baseline) ATI system estimates the velocity ambiguously because there are many candidate velocities corresponding to the interferometric phase. To resolve the ambiguity of the estimates, a multichannel (multibaseline) ATI system is required. This letter proposes an efficient implementation technique of a multichannel ATI system by using a frequency-modulated continuous wave (FMCW) radar and an antenna arrangement method considering the inherent bi-static characteristic of FMCW radars. Also, a simple and robust radial velocity estimation algorithm suitable for the proposed system model is presented. The validity of the algorithm is confirmed with simulated ATI results. Close http://ma.kaist.ac.kr/wp-content/uploads/2023/09/Multichannel-Along-Track-Interf[...] doi:10.1109/LGRS.2023.3307187 Close
430.	Fathul Muin; Tommi Hariyadi; Seong-Ook Park Design and Evaluation of mmWave Backscatter Tag System for Internet of Things Applications Conference XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023), 2023. BibTeX \| 태그: International @conference{Muin2023, title = {Design and Evaluation of mmWave Backscatter Tag System for Internet of Things Applications}, author = {Fathul Muin and Tommi Hariyadi and Seong-Ook Park}, year = {2023}, date = {2023-08-19}, booktitle = {XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023)}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } Close
429.	Ye-Eun Chi; Jinki Park; Seong-Ook Park Beamforming Transmitter for Millimeter-wave Band using Phase Detector System Conference XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023), 2023. BibTeX \| 태그: International @conference{Chi2023b, title = {Beamforming Transmitter for Millimeter-wave Band using Phase Detector System}, author = {Ye-Eun Chi and Jinki Park and Seong-Ook Park}, year = {2023}, date = {2023-08-19}, booktitle = {XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023)}, journal = {XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023)}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } Close
428.	Jinki Park; Ye-Eun Chi; Seong-Ook Park Liquid Crystal-Based Linear Array Element Control for Tunable Polarization RLSA Antenna Design Conference XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023), 2023. BibTeX \| 태그: International @conference{Park2023b, title = {Liquid Crystal-Based Linear Array Element Control for Tunable Polarization RLSA Antenna Design}, author = {Jinki Park and Ye-Eun Chi and Seong-Ook Park}, year = {2023}, date = {2023-08-19}, booktitle = {XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023)}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } Close
427.	Kim Hansol; Dong-Sik Ko; Ju-hye Kim; Seong-Ook Park FMCW Proximity sensor that minimizes the influence of leakage signal Conference XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023), 2023. BibTeX \| 태그: International @conference{Hansol2023, title = {FMCW Proximity sensor that minimizes the influence of leakage signal}, author = {Kim Hansol and Dong-Sik Ko and Ju-hye Kim and Seong-Ook Park}, year = {2023}, date = {2023-08-19}, booktitle = {XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023)}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } Close
426.	JuHong Park; SeongOok Park Micro Doppler Extraction for classification Using X-Band Chirp pulse Radar Conference XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023), 2023. BibTeX \| 태그: International @conference{Park2023c, title = {Micro Doppler Extraction for classification Using X-Band Chirp pulse Radar}, author = {JuHong Park and SeongOok Park}, year = {2023}, date = {2023-08-19}, booktitle = {XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023)}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } Close
425.	Kyung-Bin Bae; Eun-Seong Kim; Seong-Ook Park Linear Chirp Pulse Radar System Design and Detecting Ability Verification for Small Drone Detection Conference XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023), 2023. BibTeX \| 태그: International @conference{Bae2023, title = {Linear Chirp Pulse Radar System Design and Detecting Ability Verification for Small Drone Detection}, author = {Kyung-Bin Bae and Eun-Seong Kim and Seong-Ook Park}, year = {2023}, date = {2023-08-19}, booktitle = {XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023)}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } Close
424.	JunSung Park; SeongOok Park Drone Classification Model Using AI Algorithm Conference XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023), 2023. BibTeX \| 태그: International @conference{Park2023d, title = {Drone Classification Model Using AI Algorithm}, author = {JunSung Park and SeongOok Park}, year = {2023}, date = {2023-08-19}, booktitle = {XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023)}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } Close
423.	Changyu Lee; Kyungbin Bae; Ashishi Singh; Seong-Ook Park C-band NLFM Pulse Radar System Design and Predistortion Technique to detect SDR based Transponder Conference XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023), 2023. BibTeX \| 태그: International @conference{Lee2023, title = {C-band NLFM Pulse Radar System Design and Predistortion Technique to detect SDR based Transponder}, author = {Changyu Lee and Kyungbin Bae and Ashishi Singh and Seong-Ook Park}, year = {2023}, date = {2023-08-19}, booktitle = {XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023)}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } Close
422.	Yooho Jang; SeongOok Park Drone Detection and Speed Estimation Algorithm through Singular Vector in LFM Chirp Pulse Radar Conference XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023), 2023. BibTeX \| 태그: International @conference{Jang2023, title = {Drone Detection and Speed Estimation Algorithm through Singular Vector in LFM Chirp Pulse Radar}, author = {Yooho Jang and SeongOok Park}, year = {2023}, date = {2023-08-19}, booktitle = {XXXVth URSI General Assembly and Scientific Symposium (URSI GASS 2023)}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } Close
421.	Ye-Eun Chi; Jinki Park; Seong-Ook Park Hybrid Multibeamforming Receiver with High-Precision Beam Steering for Low Earth Orbit Satellite Communication Journal Article IEEE Transactions on Antennas and Propagation, 71 (7), pp. 5695-5707, 2023. Abstract \| Links \| BibTeX \| 태그: International @article{Chi2023, title = {Hybrid Multibeamforming Receiver with High-Precision Beam Steering for Low Earth Orbit Satellite Communication}, author = {Ye-Eun Chi and Jinki Park and Seong-Ook Park}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2023/09/Hybrid-Multibeamforming-Receiver-With-High-Precision-Beam-Steering-for-Low-Earth-Orbit-Satellite-Communication.pdf}, doi = {10.1109/TAP.2023.3277195}, year = {2023}, date = {2023-05-22}, journal = {IEEE Transactions on Antennas and Propagation}, volume = {71}, number = {7}, pages = {5695-5707}, abstract = {A hybrid multibeamforming receiver for low Earth orbit (LEO) satellite communication in the Ku-band is designed and tested. The proposed receiver is implemented with eight channels to enable the multibeam control. The proposed receiver, including both analog and digital beamforming structures, is capable of multibeam reception using both analog and digital beamforming techniques simultaneously or selectively. Analog beamforming is implemented by employing a local oscillator phase shifter using direct digital synthesis and phase-locked loop (PLL) structures. In digital beamforming, a software-defined radio can control the phase of the signal in the digital baseband. The multibeam received using the proposed hybrid multibeamforming receiver was measured at 11.7 and 12.7 GHz in an anechoic chamber. The phase-control resolutions of analog and digital beamforming were 0.022° and 0.72°, respectively. Analog beam-switching speed is slower than digital beamforming because it depends on the settling time of the PLL circuit, but it has a high phase-control resolution. Therefore, by using analog and digital beamforming when precise beam tilting and fast beam switching are required, respectively, the proposed hybrid multibeamforming is shown to be suitable in accordance with the communication situation.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close A hybrid multibeamforming receiver for low Earth orbit (LEO) satellite communication in the Ku-band is designed and tested. The proposed receiver is implemented with eight channels to enable the multibeam control. The proposed receiver, including both analog and digital beamforming structures, is capable of multibeam reception using both analog and digital beamforming techniques simultaneously or selectively. Analog beamforming is implemented by employing a local oscillator phase shifter using direct digital synthesis and phase-locked loop (PLL) structures. In digital beamforming, a software-defined radio can control the phase of the signal in the digital baseband. The multibeam received using the proposed hybrid multibeamforming receiver was measured at 11.7 and 12.7 GHz in an anechoic chamber. The phase-control resolutions of analog and digital beamforming were 0.022° and 0.72°, respectively. Analog beam-switching speed is slower than digital beamforming because it depends on the settling time of the PLL circuit, but it has a high phase-control resolution. Therefore, by using analog and digital beamforming when precise beam tilting and fast beam switching are required, respectively, the proposed hybrid multibeamforming is shown to be suitable in accordance with the communication situation. Close http://ma.kaist.ac.kr/wp-content/uploads/2023/09/Hybrid-Multibeamforming-Receive[...] doi:10.1109/TAP.2023.3277195 Close
420.	Jun Sung Park; Chul Ki Kim; Seong Ook Park A Stretched Deramping Radar Technique for High-Resolution SAR Processing in Ka-Band Using the Extended Integration Time Journal Article IEEE Transactions on Instrumentation and Measurement, 72 , 2023. Abstract \| Links \| BibTeX \| 태그: International @article{Park2023, title = {A Stretched Deramping Radar Technique for High-Resolution SAR Processing in Ka-Band Using the Extended Integration Time}, author = {Jun Sung Park and Chul Ki Kim and Seong Ook Park}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2023/09/A-Stretched-Deramping-Radar-Technique-for-High-Resolution-SAR-Processing-in-Ka-Band-Using-the-Extended-Integration-Time.pdf}, doi = {10.1109/TIM.2023.3264048}, year = {2023}, date = {2023-04-03}, journal = {IEEE Transactions on Instrumentation and Measurement}, volume = {72}, abstract = {To increase the image quality of synthetic aperture radar (SAR) is one of the hot issues for high-performance detection/reconnaissance. With this interest in the SAR technique, it generates various techniques according to the purposed platforms (Auto-SAR, ViSAR, InSAR, and PolSAR). In this article, we introduce high-efficiency and useful techniques, which can be applied to various SAR applications for generating high-quality images in the Ka -band. We proposed the stretched deramping hardware system applicable in the Ka -band, and design the Range-Doppler algorithm which well matches the proposed radar system with the modified signal parameters. Thus, we can extend the integration time of the convolution process in slow time and it leads to the improvement of the SAR image quality. To verify the performance of our proposed technique, we process the practical experiments in conventional outdoor fields. Furthermore, the proposed method is operated on the range Doppler algorithm (RDA), which is mostly used for standard SAR.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close To increase the image quality of synthetic aperture radar (SAR) is one of the hot issues for high-performance detection/reconnaissance. With this interest in the SAR technique, it generates various techniques according to the purposed platforms (Auto-SAR, ViSAR, InSAR, and PolSAR). In this article, we introduce high-efficiency and useful techniques, which can be applied to various SAR applications for generating high-quality images in the Ka -band. We proposed the stretched deramping hardware system applicable in the Ka -band, and design the Range-Doppler algorithm which well matches the proposed radar system with the modified signal parameters. Thus, we can extend the integration time of the convolution process in slow time and it leads to the improvement of the SAR image quality. To verify the performance of our proposed technique, we process the practical experiments in conventional outdoor fields. Furthermore, the proposed method is operated on the range Doppler algorithm (RDA), which is mostly used for standard SAR. Close http://ma.kaist.ac.kr/wp-content/uploads/2023/09/A-Stretched-Deramping-Radar-Tec[...] doi:10.1109/TIM.2023.3264048 Close
419.	Myoung-Ho Chae; Seong-Ook Park; Seung-Ho Choi; Chae-Taek Choi Commercial Fixed-Wing Drone Redirection System using GNSS Deception Journal Article IEEE Transactions on Aerospace and Electronic Systems, 59 (5), pp. 5699-5713, 2023. Links \| BibTeX \| 태그: International @article{Chae2023, title = {Commercial Fixed-Wing Drone Redirection System using GNSS Deception}, author = {Myoung-Ho Chae and Seong-Ook Park and Seung-Ho Choi and Chae-Taek Choi}, editor = {As drones become more common today, the threat of reconnaissance or attack drones to core facilities has increased, and countermeasures against them have become essential. In this study, a drone redirection system was proposed to counter illegal intrusion of commercial fixed-wing drones. The drone redirection system was designed as a closed-loop system that automatically redirects the drone to a target position. The main novelty of this study is a proposal for a system that can automatically redirect a commercial fixed-wing drone, which has not been previously explored. We proposed two strategies for redirecting drones. Additionally, simple drone modeling with a path-following algorithm was used to easily model various drones. The drone model was then tuned using flight test data, and the results were compared. Simulations were performed on the designed drone redirection system model to verify the performance of the two proposed strategies for redirecting drones in conjunction with drone fail-detection and innovation check. The performance of the drone redirection system was assessed through flight tests of Remo-M and simulations of Micropilot's hardware-in-the-loop simulator (HWILS). Through simple drone modeling, drone flight tests, and the test results from HWILS, it was proved that the drone redirection system can be applied to various fixed-wing drones.}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2023/09/Commercial-Fixed-Wing-Drone-Redirection-System-using-GNSS-Deception.pdf}, doi = {10.1109/TAES.2023.3264193}, year = {2023}, date = {2023-04-03}, journal = {IEEE Transactions on Aerospace and Electronic Systems}, volume = {59}, number = {5}, pages = {5699-5713}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close http://ma.kaist.ac.kr/wp-content/uploads/2023/09/Commercial-Fixed-Wing-Drone-Red[...] doi:10.1109/TAES.2023.3264193 Close
418.	Fathul Mu'in; Tommi Hariyadi; Seong-Ook Park FSK Backscatter Tag System for RFID Applications Conference 2023년 한국전자파학회 동계종합학술대회, 2023. BibTeX \| 태그: Domestic @conference{Mu'in2023, title = {FSK Backscatter Tag System for RFID Applications}, author = {Fathul Mu'in and Tommi Hariyadi and Seong-Ook Park}, year = {2023}, date = {2023-02-15}, booktitle = {2023년 한국전자파학회 동계종합학술대회}, journal = {2023년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
417.	Jun-Sung Park; Seong-Ook Park AI 알고리즘을 활용한 드론 고도 추정 알고리즘 Conference 2023년 한국전자파학회 동계종합학술대회, 2023. BibTeX \| 태그: Domestic @conference{Park2023e, title = {AI 알고리즘을 활용한 드론 고도 추정 알고리즘}, author = {Jun-Sung Park and Seong-Ook Park}, year = {2023}, date = {2023-02-15}, booktitle = {2023년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
416.	Yoo-Ho Jang; Seong-Ook Park Low-speed drone detection and speed estimation method through singular value decomposition in LFM pulse radar Conference 2023년 한국전자파학회 동계종합학술대회, 2023. BibTeX \| 태그: Domestic @conference{Jang2023b, title = {Low-speed drone detection and speed estimation method through singular value decomposition in LFM pulse radar}, author = {Yoo-Ho Jang and Seong-Ook Park}, year = {2023}, date = {2023-02-15}, booktitle = {2023년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
415.	Kyung-Bin Bae; Seong-Ook Park 불법 소형 무인이동체 재밍을 위한 다중 대역 재머 설계 및 성능 검증 Conference 2023년 한국전자파학회 동계종합학술대회, 2023. BibTeX \| 태그: Domestic @conference{Bae2023d, title = {불법 소형 무인이동체 재밍을 위한 다중 대역 재머 설계 및 성능 검증}, author = {Kyung-Bin Bae and Seong-Ook Park}, year = {2023}, date = {2023-02-15}, booktitle = {2023년 한국전자파학회 동계종합학술대회}, journal = {2023년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
414.	Jinki Park; Ye-Eun Chi; Seong-Ook Park 마이크로스트립에 내장된 액정의 비등방 유전 특성 계산 Conference 2023년 한국전자파학회 동계종합학술대회, 2023. BibTeX \| 태그: Domestic @conference{Park2023f, title = {마이크로스트립에 내장된 액정의 비등방 유전 특성 계산}, author = {Jinki Park and Ye-Eun Chi and Seong-Ook Park}, year = {2023}, date = {2023-02-15}, booktitle = {2023년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
2022
413.	Laxmikant Minz; Ye-eun Chi; Kyunghoon Kwon; Min-Seon Yun; Young-Chan Moon; Duk-Yong Kim; Seong-Ook Park Utilizing Non-Orthogonal Polarization With Polarization Reuse Technique for 4 × 4 MIMO Capacity Enhancement Journal Article IEEE Access, 10 , pp. 131952-131964, 2022. Abstract \| Links \| BibTeX \| 태그: International @article{Minz2022b, title = {Utilizing Non-Orthogonal Polarization With Polarization Reuse Technique for 4 × 4 MIMO Capacity Enhancement}, author = {Laxmikant Minz and Ye-eun Chi and Kyunghoon Kwon and Min-Seon Yun and Young-Chan Moon and Duk-Yong Kim and Seong-Ook Park}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2023/03/Utilizing_Non-Orthogonal_Polarization_With_Polarization_Reuse_Technique_for_4__4_MIMO_Capacity_Enhancement.pdf}, doi = {10.1109/ACCESS.2022.3228043}, year = {2022}, date = {2022-12-09}, journal = {IEEE Access}, volume = {10}, pages = {131952-131964}, abstract = {5G communication promises fast and large data stream which requires higher capacity of a cellular wireless network. A higher capacity could be achieved with wider bandwidth and network densification, but they are expensive approaches. Instead, upgrading the wireless network with higher-order Multiple Input Multiple Output (MIMO) antenna system with polarization diversity can inexpensively escalate the peak data rate for higher capacity. We present a 4×4 MIMO cellular network scheme utilizing polarization reuse and using 4 polarization to reform the cellular network from current state of the art of dual polarization 4×4 MIMO scheme. 4 Polarization (vertical, Horizontal, ±45° slant) is used in 2 orthogonal polarization pair form, with a beam-separation among pair, to intensify polarization diversity and maximize the MIMO network channel capacity. This beam-separated polarization reuse technique minimizes the channel correlation which maximizes the probability of four independent data streams (rank 4). The simulated result of the channel capacity with the proposed scheme achieves a 30% higher capacity compared to the baseline configuration of 3-sector 4×4 MIMO. The field trial of the presented network indicates a higher portion of rank 4, supporting four independent data streams in the rich scattering environment of a cellular network.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close 5G communication promises fast and large data stream which requires higher capacity of a cellular wireless network. A higher capacity could be achieved with wider bandwidth and network densification, but they are expensive approaches. Instead, upgrading the wireless network with higher-order Multiple Input Multiple Output (MIMO) antenna system with polarization diversity can inexpensively escalate the peak data rate for higher capacity. We present a 4×4 MIMO cellular network scheme utilizing polarization reuse and using 4 polarization to reform the cellular network from current state of the art of dual polarization 4×4 MIMO scheme. 4 Polarization (vertical, Horizontal, ±45° slant) is used in 2 orthogonal polarization pair form, with a beam-separation among pair, to intensify polarization diversity and maximize the MIMO network channel capacity. This beam-separated polarization reuse technique minimizes the channel correlation which maximizes the probability of four independent data streams (rank 4). The simulated result of the channel capacity with the proposed scheme achieves a 30% higher capacity compared to the baseline configuration of 3-sector 4×4 MIMO. The field trial of the presented network indicates a higher portion of rank 4, supporting four independent data streams in the rich scattering environment of a cellular network. Close http://ma.kaist.ac.kr/wp-content/uploads/2023/03/Utilizing_Non-Orthogonal_Polari[...] doi:10.1109/ACCESS.2022.3228043 Close
412.	Rao Shahid Aziz; Amit Kumar Singh; Jun-Sung Park; Seong-Ook Park; Slawomir Koziel Compact electromagnetic lens antennas using cascaded metasurfaces for gain enhancement and beam steering applications Journal Article Internatioinal Journal of RF and Microwave Computer-Aided Engieering, 32 (11), pp. e23327, 2022. Abstract \| Links \| BibTeX \| 태그: International @article{Aziz2022, title = {Compact electromagnetic lens antennas using cascaded metasurfaces for gain enhancement and beam steering applications}, author = {Rao Shahid Aziz and Amit Kumar Singh and Jun-Sung Park and Seong-Ook Park and Slawomir Koziel}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2023/03/Int-J-RF-Mic-Comp-Aid-Eng-2022-Aziz-Compact-electromagnetic-lens-antennas-using-cascaded-metasurfaces-for-gain.pdf}, doi = {10.1002/mmce.23327}, year = {2022}, date = {2022-07-27}, journal = {Internatioinal Journal of RF and Microwave Computer-Aided Engieering}, volume = {32}, number = {11}, pages = {e23327}, abstract = {Electromagnetic (EM) lens antenna designs using cascaded metasurfaces for gain enhancement and beam steering applications are proposed. Two different lens aperture designs are proposed and populated with aperiodic unit cells of size 0.2λo × 0.2λo. In lens Design 1, the unit cells of different phases are distributed in concentric circular zones, whereas in lens Design 2, the unit cells of different phases are distributed in vertical linear zones on the aperture of the EM lens. Both lenses are composed of two cascaded metasurfaces with an air gap of 0.047λo (where λo = 51.7 mm at 5.8 GHz). For gain enhancement, the metasurfaces are positioned at an optimum focal distance, f = 0.61λo above source patch antenna (f/D = 0.3). Beam steering is accomplished by phase transformation of the source antenna, which can be realized by mechanically sliding the passive metasurfaces in one direction (i.e., ±x-direction) above the source antenna. The prototype of the two proposed lenses are fabricated and tested. The measured peak boresight gain obtained from Design 1 and 2 are 14.98 and 15.12 dBi, respectively. The experimental results show −25° to +25° and −27° to +27° beam steering range for Design 1 and 2, respectively, with a little gain degradation at other angles.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close Electromagnetic (EM) lens antenna designs using cascaded metasurfaces for gain enhancement and beam steering applications are proposed. Two different lens aperture designs are proposed and populated with aperiodic unit cells of size 0.2λo × 0.2λo. In lens Design 1, the unit cells of different phases are distributed in concentric circular zones, whereas in lens Design 2, the unit cells of different phases are distributed in vertical linear zones on the aperture of the EM lens. Both lenses are composed of two cascaded metasurfaces with an air gap of 0.047λo (where λo = 51.7 mm at 5.8 GHz). For gain enhancement, the metasurfaces are positioned at an optimum focal distance, f = 0.61λo above source patch antenna (f/D = 0.3). Beam steering is accomplished by phase transformation of the source antenna, which can be realized by mechanically sliding the passive metasurfaces in one direction (i.e., ±x-direction) above the source antenna. The prototype of the two proposed lenses are fabricated and tested. The measured peak boresight gain obtained from Design 1 and 2 are 14.98 and 15.12 dBi, respectively. The experimental results show −25° to +25° and −27° to +27° beam steering range for Design 1 and 2, respectively, with a little gain degradation at other angles. Close http://ma.kaist.ac.kr/wp-content/uploads/2023/03/Int-J-RF-Mic-Comp-Aid-Eng-2022-[...] doi:10.1002/mmce.23327 Close
411.	Young-Geun Kang; Goo-Hwan Shin; Seong-Ook Park Validation of the feasibility of implementing spotlight SAR mode in the NEXTSat-2 and Ka-Band Satellite Conference The 14th Global Symposium on Millimeter-Waves & Terahertz(GSMM 2022), Korea, 2022. BibTeX \| 태그: International @conference{Kang2022b, title = {Validation of the feasibility of implementing spotlight SAR mode in the NEXTSat-2 and Ka-Band Satellite}, author = {Young-Geun Kang and Goo-Hwan Shin and Seong-Ook Park}, year = {2022}, date = {2022-05-18}, booktitle = {The 14th Global Symposium on Millimeter-Waves & Terahertz(GSMM 2022)}, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } Close
410.	Jun-Sung Park; Chul-Ki Kim; Seong-Ook Park A Stretched De-Ramping Radar System for High-Quality SAR Image in Ka-Band Conference The 14th Global Symposium on Millimeter-Waves & Terahertz(GSMM 2022), Korea, 2022. BibTeX \| 태그: International @conference{Park2022, title = {A Stretched De-Ramping Radar System for High-Quality SAR Image in Ka-Band}, author = {Jun-Sung Park and Chul-Ki Kim and Seong-Ook Park}, year = {2022}, date = {2022-05-18}, booktitle = {The 14th Global Symposium on Millimeter-Waves & Terahertz(GSMM 2022)}, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } Close
409.	Ye-Eun Chi; Jinki Park; Seong-Ook Park A Novel Phase Detection System Applicable to Calibration Techniques Conference The 14th Global Symposium on Millimeter-Waves & Terahertz(GSMM 2022), Korea, 2022. BibTeX \| 태그: International @conference{Chi2022, title = {A Novel Phase Detection System Applicable to Calibration Techniques}, author = {Ye-Eun Chi and Jinki Park and Seong-Ook Park}, year = {2022}, date = {2022-05-18}, booktitle = {The 14th Global Symposium on Millimeter-Waves & Terahertz(GSMM 2022)}, address = {Korea}, keywords = {International}, pubstate = {published}, tppubtype = {conference} } Close
408.	Young-Geun Kang; Dae-Hwan Jung; Goo-Hwan Shin; Chul-Ki Kim; Seong-Ook Park A Study on the Feasibility of Stop-and-Go Approximation in FMCW SAR Journal Article Journal of Electromagnetic Engineering and Science, 22 (3), pp. 210-217, 2022. Links \| BibTeX \| 태그: International @article{Kang2022d, title = {A Study on the Feasibility of Stop-and-Go Approximation in FMCW SAR}, author = {Young-Geun Kang and Dae-Hwan Jung and Goo-Hwan Shin and Chul-Ki Kim and Seong-Ook Park}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2022/06/jees-2022-3-r-79.pdf}, doi = {10.26866/jees.2022.3.r.79}, year = {2022}, date = {2022-04-20}, journal = {Journal of Electromagnetic Engineering and Science}, volume = {22}, number = {3}, pages = {210-217}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close http://ma.kaist.ac.kr/wp-content/uploads/2022/06/jees-2022-3-r-79.pdf doi:10.26866/jees.2022.3.r.79 Close
407.	Young-Geun Kang; Chul-Ki Kim; Seong-Ook Park Ocean Image Formation Algorithm Using Altimeter Data for Next Generation Satellite SAR Journal Article Journal of Electromagnetic Engineering and Science, 22 (2), pp. 85-94, 2022. Abstract \| Links \| BibTeX \| 태그: International @article{Kang2022, title = {Ocean Image Formation Algorithm Using Altimeter Data for Next Generation Satellite SAR}, author = {Young-Geun Kang and Chul-Ki Kim and Seong-Ook Park}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2022/05/jees-2022-2-r-64.pdf}, doi = {10.26866/jees.2022.2.r.64}, year = {2022}, date = {2022-03-31}, journal = {Journal of Electromagnetic Engineering and Science}, volume = {22}, number = {2}, pages = {85-94}, abstract = {Synthetic aperture radar (SAR) obtains two-dimensional images of the Earth’s surface. Spatial resolution is one of the most important factors in evaluating SAR performance. Therefore, high operating frequencies are preferred for obtaining high resolution images. In fact, Ku-band and Ka-band are used in the automobile SAR (Auto-SAR) and the aircraft SAR (Airborne-SAR). However, the operating frequencies of the satellite SAR (Spaceborne-SAR) are limited to the X-band because of the wide Doppler frequency band caused by the satellite’s high velocity. To overcome this frequency limitation in satellite SAR, we propose a low-complexity SAR algorithm that forms images of the ocean using satellite altimeter data with an operating frequency of the Ku-band (13.575 GHz). The algorithm requires the burst mode pulse transmission technique frequently used in SAR altimeters. To validate the proposed algorithm as being suitable for ocean image formation, point target simulation and analysis are performed, and some quantitative results are provided.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close Synthetic aperture radar (SAR) obtains two-dimensional images of the Earth’s surface. Spatial resolution is one of the most important factors in evaluating SAR performance. Therefore, high operating frequencies are preferred for obtaining high resolution images. In fact, Ku-band and Ka-band are used in the automobile SAR (Auto-SAR) and the aircraft SAR (Airborne-SAR). However, the operating frequencies of the satellite SAR (Spaceborne-SAR) are limited to the X-band because of the wide Doppler frequency band caused by the satellite’s high velocity. To overcome this frequency limitation in satellite SAR, we propose a low-complexity SAR algorithm that forms images of the ocean using satellite altimeter data with an operating frequency of the Ku-band (13.575 GHz). The algorithm requires the burst mode pulse transmission technique frequently used in SAR altimeters. To validate the proposed algorithm as being suitable for ocean image formation, point target simulation and analysis are performed, and some quantitative results are provided. Close http://ma.kaist.ac.kr/wp-content/uploads/2022/05/jees-2022-2-r-64.pdf doi:10.26866/jees.2022.2.r.64 Close
406.	Chul-Ki Kim; Mi-Young Park; Goo-Hwan Shin; Seong-Ook Park An Improved Technique for Single-Channel Video-SAR Based on Fractional Fourier Transform Journal Article IEEE Transactions on Aerospace and Electronic Systems, 2022. Abstract \| Links \| BibTeX \| 태그: International @article{Kim2022, title = {An Improved Technique for Single-Channel Video-SAR Based on Fractional Fourier Transform}, author = {Chul-Ki Kim and Mi-Young Park and Goo-Hwan Shin and Seong-Ook Park}, url = {http://ma.kaist.ac.kr/wp-content/uploads/2023/10/An-Improved-Technique-for-Single-Channel-Video-SAR-Based-on-Fractional-Fourier-Transform.pdf}, doi = {10.1109/TAES.2022.3157657}, year = {2022}, date = {2022-03-08}, journal = {IEEE Transactions on Aerospace and Electronic Systems}, abstract = {In the field of Synthetic Aperture Radar (SAR), a lot of researchers have tried to study an improved application beyond the conventional 2D image. Video-SAR (ViSAR) is one of the hot-issue in the SAR application. The main purpose of ViSAR is to monitor various targets in the area of interest in time order. It can offer video images to detect not only the fixed target but also the moving target. For the signal processing of ViSAR, this paper introduces the improved performance by the Doppler shifting technique with Fractional Fourier Transform (FrFT). And also, it shows that the proposed method can separate the unexpected signal of the moving target within each frame of single-channel ViSAR. Furthermore, the overall algorithm can increase efficiency and reliability in ViSAR processing. To verify the improvement of our method, we carry out the practical experiments by an X-band chirp pulse SAR system, mounted on an airplane.}, keywords = {International}, pubstate = {published}, tppubtype = {article} } Close In the field of Synthetic Aperture Radar (SAR), a lot of researchers have tried to study an improved application beyond the conventional 2D image. Video-SAR (ViSAR) is one of the hot-issue in the SAR application. The main purpose of ViSAR is to monitor various targets in the area of interest in time order. It can offer video images to detect not only the fixed target but also the moving target. For the signal processing of ViSAR, this paper introduces the improved performance by the Doppler shifting technique with Fractional Fourier Transform (FrFT). And also, it shows that the proposed method can separate the unexpected signal of the moving target within each frame of single-channel ViSAR. Furthermore, the overall algorithm can increase efficiency and reliability in ViSAR processing. To verify the improvement of our method, we carry out the practical experiments by an X-band chirp pulse SAR system, mounted on an airplane. Close http://ma.kaist.ac.kr/wp-content/uploads/2023/10/An-Improved-Technique-for-Singl[...] doi:10.1109/TAES.2022.3157657 Close
405.	Jun-Sung Park; Seong-Ook Park 드론 탐지 레이다 현황 및 기술 소개 Conference 2022년 한국전자파학회 동계종합학술대회, 2022. BibTeX \| 태그: Domestic @conference{Park2022b, title = {드론 탐지 레이다 현황 및 기술 소개}, author = {Jun-Sung Park and Seong-Ook Park}, year = {2022}, date = {2022-02-09}, booktitle = {2022년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
404.	Young-Geun Kang; Mi-Young Park; Seong-Ook Park 차세대 소형위성 2호에서의 Spotlight SAR mode 구현 가능성 검증 Conference 2022년 한국전자파학회 동계종합학술대회, 2022. BibTeX \| 태그: Domestic @conference{Kang2022c, title = {차세대 소형위성 2호에서의 Spotlight SAR mode 구현 가능성 검증}, author = {Young-Geun Kang and Mi-Young Park and Seong-Ook Park}, year = {2022}, date = {2022-02-09}, booktitle = {2022년 한국전자파학회 동계종합학술대회}, journal = {2022년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
403.	Jun-Sung Park; Seong-Ook Park Ka-band SAR 영상 획득 알고리즘 Conference 2022년 한국전자파학회 동계종합학술대회, 2022. BibTeX \| 태그: Domestic @conference{Park2022c, title = {Ka-band SAR 영상 획득 알고리즘}, author = {Jun-Sung Park and Seong-Ook Park}, year = {2022}, date = {2022-02-09}, booktitle = {2022년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
402.	Ji-Sang Yoon; Mi-Young Park; Seong-Ook Park 소형위성 SAR 신호처리를 위한 데이터기반 도플러 파라미터 추출 알고리즘 구현 Conference 2022년 한국전자파학회 동계종합학술대회, 2022. BibTeX \| 태그: Domestic @conference{Yoon2022, title = {소형위성 SAR 신호처리를 위한 데이터기반 도플러 파라미터 추출 알고리즘 구현}, author = {Ji-Sang Yoon and Mi-Young Park and Seong-Ook Park}, year = {2022}, date = {2022-02-09}, booktitle = {2022년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
401.	Seungwoon Park; Seong-Ook Park Ku 밴드 FMCW 트라리앵귤러 첩을 활용한 SAR 이미지 처리 Conference 2022년 한국전자파학회 동계종합학술대회, 2022. BibTeX \| 태그: Domestic @conference{Park2022d, title = {Ku 밴드 FMCW 트라리앵귤러 첩을 활용한 SAR 이미지 처리}, author = {Seungwoon Park and Seong-Ook Park}, year = {2022}, date = {2022-02-09}, booktitle = {2022년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
400.	Han-Sol Kim; Seong-Ook Park 누설신호 제거 기법이 적용된 잡음 영향 및 Clutter 영향을 최소화하는 FMCW Sensor Conference 2022년 한국전자파학회 동계종합학술대회, 2022. BibTeX \| 태그: Domestic @conference{Kim2022b, title = {누설신호 제거 기법이 적용된 잡음 영향 및 Clutter 영향을 최소화하는 FMCW Sensor}, author = {Han-Sol Kim and Seong-Ook Park}, year = {2022}, date = {2022-02-09}, booktitle = {2022년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
399.	Kyung-Bin Bae; Dong-Ha Yang; Seong-Ook Park Chirp Pulse Radar에 적용 가능한 특이 값 분해를 이용한 Clutter 제거 기법 및 이를 이용한 소형 드론 탐지 Conference 2022년 한국전자파학회 동계종합학술대회, 2022. BibTeX \| 태그: Domestic @conference{Bae2022b, title = {Chirp Pulse Radar에 적용 가능한 특이 값 분해를 이용한 Clutter 제거 기법 및 이를 이용한 소형 드론 탐지}, author = {Kyung-Bin Bae and Dong-Ha Yang and Seong-Ook Park}, year = {2022}, date = {2022-02-09}, booktitle = {2022년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close
398.	Ye-eun Chi; Jinki Park; Seong-Ook Park 위상 검출 시스템을 이용한 밀리미터파 대역 빔포밍 송신기 Conference 2022년 한국전자파학회 동계종합학술대회, 2022. BibTeX \| 태그: Domestic @conference{Chi2022b, title = {위상 검출 시스템을 이용한 밀리미터파 대역 빔포밍 송신기}, author = {Ye-eun Chi and Jinki Park and Seong-Ook Park}, year = {2022}, date = {2022-02-09}, booktitle = {2022년 한국전자파학회 동계종합학술대회}, keywords = {Domestic}, pubstate = {published}, tppubtype = {conference} } Close

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