한국전자파학회논문지 (The Journal of Korean Institute of Electromagnetic Engineering and Science)

About The Journal of Korean Institute of Electromagnetic Engineering and Science

JKIEES (The Journal of Korean Institute of Electromagnetic Engineering and Science) was launched in 1996 and has been published Monthly by the Korean Institute of Electromagnetic Engineering and Science. It was selected as a candidate journal to be registered with National Research Foundation of Korea and finally registered with the Foundation in 2004. Total of the articles in our journal are indexed in DOI/CrossRef, Google Scholar, and EBSCO. For a period of 16 years, about 2,300 excellent papers have been published by our journal. JKIEES has posted papers largely on profound research of antennas, microwave engineering, EMI/EMC, and applied electromagnetics. Its fields of contributed paper also have been expanded into diverse areas such as wireless communication systems, spectrum engineering, RF systems, electromagnetic materials, radar and radio application, and electromagnetic scattering and imaging. Since 2004, JKIEES has encouraged contributions from authors whose papers were recommended as excellent papers by academic conference heads and posted their papers in featured sessions.
특집논문/SPECIAL EDITION

Apr 30, 2022

Design of Wideband Automotive C-PAD Antennas Using Shorted Coupling Stubs
단락된 전자기 결합 스터브를 활용한 광대역 차량용 C-PAD 안테나 설계

Hyok Lee, Jea-Hoon Choi 이혁, 최재훈

J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):253-258.
https://doi.org/10.5515/KJKIEES.2022.33.4.253

In this study, an automotive two-port MIMO C-PAD antenna with 1 Tx and 2 Rx for 4G/5G IVI wireless communication systems was designed. The C-PAD antenna consisted of two antenna elements using a microstrip line monopole on a two-layer PCB. To implement the wideband characteristics of 1,710 to 3,500 MHz, two antenna elements were designed using a basic monopole structure and a shorted coupling stub. The fabricated C-PAD antenna had a VSWR below 2.1 in the 1,710 to 3,500 MHz range and a measured gain of −2.14 to 1.52 dBi at θ
특집논문/SPECIAL EDITION

Apr 30, 2022

Performance Analysis of Refocusing Algorithms for KOMPSAT-5 Images
KOMPSAT-5 영상에 대한 재초점화(Refocusing) 성능 분석

Seung-Jae Lee, Sun-Gu Lee 이승재, 이선구

J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):259-264.
https://doi.org/10.5515/KJKIEES.2022.33.4.259

In this study, we analyzed the performance of a refocusing algorithm that compensates for the blurring effect of a moving target in a synthetic aperture radar image. First, sub-images containing blurred target signals were extracted from the images obtained from the KOrea Multi-Purpose SATellite-5 (KOMPSAT-5). Subsequently, some refocusing algorithms were applied to the sub-images to compensate for the blurring effect of the moving target, and their performance was analyzed.
특집단편논문/SPECIAL SHORT EDITION

Apr 30, 2022

Electro-Optic Conversion Device for Naval Radar Operation
함정용 레이다 운용을 위한 전광변환장치

Beom-Ik Son, Jae-Hung Choi, Jong-Mann Kim 손범익, 최재흥, 김종만

J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):265-268.
https://doi.org/10.5515/KJKIEES.2022.33.4.265

Generally, the signal source of active phased array multi-function naval radars is located inside the ship; thus, when an electrical signal source is transmitted to the antenna of the ship, it is difficult to supply a sufficient source to the antenna owing to the distance. In this study, we designed and fabricated an electro-optical conversion device that overcomes this problem by converting electrical signals into optical signals before supplying them. The fabricated device performed electro-optical conversion of the reference signal, local si...
논문/REGULAR PAPERS

Apr 30, 2022

Compact Bandpass Filter Design Using Advanced Equivalent Modeling Method
향상된 등가 모델링 기법을 이용한 소형 대역통과 필터 설계

Seok Yoon, Yu-Seon Kim, Seok Bae, Yeong-seog Lim 윤석, 김유선, 배석, 임영석

J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):269-277.
https://doi.org/10.5515/KJKIEES.2022.33.4.269

In this study, the impedance characteristics of chip elements are applied to a bandpass filter circuit design using an enhanced equivalent modeling technique for the chip inductor. This technique can analyze the impedance characteristics, including the internal elements of the chip, tolerance, and parasitic elements. By applying the improved equivalent modeling method, it is possible to satisfy the chip element values required for circuit design. This was tested by applying the proposed technique to the design of a 5G sub-6 GHz bandpass filter ...
논문/REGULAR PAPERS

Apr 30, 2022

Ultra-Wideband Compact Rectifier Based on Coupled Transmission-Line Network
결합된 전송선로 네트워크 기반 초광대역 초소형 정류기

Hyunah Park, Bitchan Kim, Juntaek Oh 박현아, 김빛찬, 오준택

J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):278-283.
https://doi.org/10.5515/KJKIEES.2022.33.4.278

In this study, we propose the design and fabrication of a compact ultra-wideband high-efficiency rectifier based on a coupled transmission-line network. The proposed rectifier consists of a coupled transmission-line network and a voltage multiplier that increases the rectified peak voltage. The coupled transmission-line network was optimized to match the input impedance of the voltage multiplier without additional matching components, thus achieving a high power conversion efficiency of over 50 % in the ultra-wideband of 0.2-4.3 GHz. To verify ...
논문/REGULAR PAPERS

Apr 30, 2022

Design of Thinned Phased Array Antenna with Subarrays
부배열이 적용된 Thinned 위상배열안테나 설계

Taeyong Jeong, Kyunghyun Oh, Jun Young Jung, Keum Cheol Hwang 정태용, 오경현, 정준영, 황금철

J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):284-292.
https://doi.org/10.5515/KJKIEES.2022.33.4.284

In this paper, a 36×36 design of a thinned phased array antenna with subarrays is proposed. Binary-genetic learning particle swarm optimization (GLPSO) was used to design a thinned phased array antenna with a thinning factor of 60 % to 65 %, and continuous-GLPSO was used to apply 36 subarray shapes. The RF beam steering range was an azimuth/elevation of 40°, the sidelobe levels (SLLs) were 26.67 dB and 28.43 dB, and the half-power beamwidths (HPBWs) were 4.6° and 4.7°. When the subarrays were applied, the digital beam steering range was H...
논문/REGULAR PAPERS

Apr 30, 2022

Ka-Band 16-Way Radial Power Combiner Design with Low-Loss and High-Efficiency
저손실 고효율 Ka-대역 16-Way 방사형 도파관 결합기 설계

Jonggyu Go, Kyungmin Nam, Boki Kim, Kunjun Lee, Jian Park, Sanghoon Kim, Seungsik Yang 고종규, 남경민, 김보기, 이건준, 박지안, 김상훈, 양승식

J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):293-299.
https://doi.org/10.5515/KJKIEES.2022.33.4.293

In this study, a 16-way radial power combiner with low loss and high efficiency operating in the Ka-band is designed and fabricated. The proposed combiner is designed using a short-pinned waveguide-to-microstrip transition structure to avoid dielectric breakdown that may occur when combining high powers. It was designed and optimized using a 3D electromagnetic simulation, and verified using a network analyzer. The proposed radial power combiner showed a low phase difference of 2.1° to 3° or less between ports, low return loss of −13 dB, in...
논문/REGULAR PAPERS

Apr 30, 2022

Multi-Loop Low Drop-Out Voltage Regulator with Improved Output Voltage Regulation
개선된 전압 변동률을 갖는 다중 루프 저전압강하 레귤레이터

Hui-Jae Han, Nam Yoon Kim, Chang-Woo Kim 한희재, 김남윤, 김창우

J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):300-304.
https://doi.org/10.5515/KJKIEES.2022.33.4.300

Using the 28 nm complementary metal-oxide semiconductor (CMOS) process, a multi-loop low drop-out voltage (LDO) regulator circuit was designed for use in a wireless power transmission receiver integrated circuit. The LDO regulator uses two differential error amplifiers to provide a stable output voltage to the load with a common source P-channel MOS circuit between the two amplifiers to improve the voltage variation rate (line regulation). The LDO regulator produces an output voltage of 1.2 V from an input voltage range of 1.3∽2.1 V and volta...
논문/REGULAR PAPERS

Apr 30, 2022

A D-Band Frequency Multiplier with I/Q Generation in 40 nm CMOS
40 nm CMOS 공정을 이용한 I/Q 생성이 내재된 D-대역 주파수 체배기

Changjung Lee, Munkyo Seo 이창중, 서문교

J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):305-311.
https://doi.org/10.5515/KJKIEES.2022.33.4.305

This paper presents a D-band frequency multiplier consisting of a single-ended to differential converter, frequency multiplier-by-nine, 90° hybrid coupler, and D-band amplifier. The designed D-band frequency multiplier was fabricated using the 40 nm CMOS process. A frequency multiplier-by-nine was implemented using a two-stage cascade frequency tripler. A Lange coupler with broadband performance was used to generate an I/Q local oscillator signal with a 90° relative phase difference. The on-wafer measurement showed a peak output power of 3.4...
논문/REGULAR PAPERS

Apr 30, 2022

A 140 GHz Low-Noise Amplifier in 40 nm CMOS
140 GHz 40 nm CMOS 저잡음 증폭기

Chaeeun Park, Munkyo Seo 박채은, 서문교

J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):312-317.
https://doi.org/10.5515/KJKIEES.2022.33.4.312

This paper presents a 140 GHz four-stage low-noise amplifier in a 40 nm CMOS process. The input, output, and interstage of the amplifier were matched using a microstrip line (composed of lowest two metal layers and a top metal layer). An AC ground using bypass capacitors was formed to minimize the effect of the internal inductance of the external power supply. The number of capacitors was chosen considering an ideal AC ground case for the ground and noise figures. D-band on-wafer measurements indicated a gain of 15.6 dB, noise figure of 8.8 dB,...
논문/REGULAR PAPERS

Apr 30, 2022

W-Band Broadband Low Noise Amplifier Design
W-Band 광대역 저잡음 증폭기 설계

Han-Woong Choi, Ki-Choul Kim, Juman Park, Choul-Young Kim 최한웅, 김기철, 박주만, 김철영

J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):318-322.
https://doi.org/10.5515/KJKIEES.2022.33.4.318

This paper presents a W-band broadband low noise amplifier (LNA). The proposed LNA was designed and verified using a 100 nm GaAs pHEMT. To achieve broadband low noise and gain characteristics, peak gain distribution was employed. The LNA comprised four gain stages and a shunt inductor at the input stage to prevent the device damage. The LNA achieved a 16.2 dB gain and 5.5 dB noise figure in an area of 1.78×0.743 mm²
논문/REGULAR PAPERS

Apr 30, 2022

Study on High-Resolution Bistatic-SAR Imaging for Curved-Path Geometry Using Polynomial-Omega-K Algorithm
다항식 기반 오메가-케이 알고리즘을 이용한 곡선기하에서의 고해상도 바이스태틱 SAR 영상생성에 대한 연구

Byung-Soo Kang, Kiwoong Lee 강병수, 이기웅

J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):323-332.
https://doi.org/10.5515/KJKIEES.2022.33.4.323

In this study, we propose a high-resolution synthetic aperture radar (SAR) imaging method for curved-orbit geometry in bistatic configurations with spatially separated transmitter and receiver. To accommodate large curved-path and bistatic configuration properties, we first formulate a B-SAR signal using a polynomial range model and derive its two-dimensional (2D) phase spectrum. Next, we extend the basic concept of the typical omega-K algorithm (OKA) for B-SAR by focusing on the polynomial range model, referred to as polynomial-OKA (P-OKA), en...

CURRENT ISSUE: Apr 2022, Vol. 33 , No. 4

특집논문/SPECIAL EDITION Design of Wideband Automotive C-PAD Antennas Using Shorted Coupling Stubs 단락된 전자기 결합 스터브를 활용한 광대역 차량용 C-PAD 안테나 설계 Hyok Lee, Jea-Hoon Choi 이혁, 최재훈 J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):253-258. https://doi.org/10.5515/KJKIEES.2022.33.4.253 HTML PDF PubReader	특집논문/SPECIAL EDITION Performance Analysis of Refocusing Algorithms for KOMPSAT-5 Images KOMPSAT-5 영상에 대한 재초점화(Refocusing) 성능 분석 Seung-Jae Lee, Sun-Gu Lee 이승재, 이선구 J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):259-264. https://doi.org/10.5515/KJKIEES.2022.33.4.259 HTML PDF PubReader
특집단편논문/SPECIAL SHORT EDITION Electro-Optic Conversion Device for Naval Radar Operation 함정용 레이다 운용을 위한 전광변환장치 Beom-Ik Son, Jae-Hung Choi, Jong-Mann Kim 손범익, 최재흥, 김종만 J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):265-268. https://doi.org/10.5515/KJKIEES.2022.33.4.265 HTML PDF PubReader	논문/REGULAR PAPERS Compact Bandpass Filter Design Using Advanced Equivalent Modeling Method 향상된 등가 모델링 기법을 이용한 소형 대역통과 필터 설계 Seok Yoon, Yu-Seon Kim, Seok Bae, Yeong-seog Lim 윤석, 김유선, 배석, 임영석 J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):269-277. https://doi.org/10.5515/KJKIEES.2022.33.4.269 HTML PDF PubReader
논문/REGULAR PAPERS Ultra-Wideband Compact Rectifier Based on Coupled Transmission-Line Network 결합된 전송선로 네트워크 기반 초광대역 초소형 정류기 Hyunah Park, Bitchan Kim, Juntaek Oh 박현아, 김빛찬, 오준택 J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):278-283. https://doi.org/10.5515/KJKIEES.2022.33.4.278 HTML PDF PubReader	논문/REGULAR PAPERS Design of Thinned Phased Array Antenna with Subarrays 부배열이 적용된 Thinned 위상배열안테나 설계 Taeyong Jeong, Kyunghyun Oh, Jun Young Jung, Keum Cheol Hwang 정태용, 오경현, 정준영, 황금철 J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):284-292. https://doi.org/10.5515/KJKIEES.2022.33.4.284 HTML PDF PubReader
논문/REGULAR PAPERS Ka-Band 16-Way Radial Power Combiner Design with Low-Loss and High-Efficiency 저손실 고효율 Ka-대역 16-Way 방사형 도파관 결합기 설계 Jonggyu Go, Kyungmin Nam, Boki Kim, Kunjun Lee, Jian Park, Sanghoon Kim, Seungsik Yang 고종규, 남경민, 김보기, 이건준, 박지안, 김상훈, 양승식 J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):293-299. https://doi.org/10.5515/KJKIEES.2022.33.4.293 HTML PDF PubReader	논문/REGULAR PAPERS Multi-Loop Low Drop-Out Voltage Regulator with Improved Output Voltage Regulation 개선된 전압 변동률을 갖는 다중 루프 저전압강하 레귤레이터 Hui-Jae Han, Nam Yoon Kim, Chang-Woo Kim 한희재, 김남윤, 김창우 J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):300-304. https://doi.org/10.5515/KJKIEES.2022.33.4.300 HTML PDF PubReader
논문/REGULAR PAPERS A D-Band Frequency Multiplier with I/Q Generation in 40 nm CMOS 40 nm CMOS 공정을 이용한 I/Q 생성이 내재된 D-대역 주파수 체배기 Changjung Lee, Munkyo Seo 이창중, 서문교 J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):305-311. https://doi.org/10.5515/KJKIEES.2022.33.4.305 HTML PDF PubReader	논문/REGULAR PAPERS A 140 GHz Low-Noise Amplifier in 40 nm CMOS 140 GHz 40 nm CMOS 저잡음 증폭기 Chaeeun Park, Munkyo Seo 박채은, 서문교 J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):312-317. https://doi.org/10.5515/KJKIEES.2022.33.4.312 HTML PDF PubReader
논문/REGULAR PAPERS W-Band Broadband Low Noise Amplifier Design W-Band 광대역 저잡음 증폭기 설계 Han-Woong Choi, Ki-Choul Kim, Juman Park, Choul-Young Kim 최한웅, 김기철, 박주만, 김철영 J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):318-322. https://doi.org/10.5515/KJKIEES.2022.33.4.318 HTML PDF PubReader	논문/REGULAR PAPERS Study on High-Resolution Bistatic-SAR Imaging for Curved-Path Geometry Using Polynomial-Omega-K Algorithm 다항식 기반 오메가-케이 알고리즘을 이용한 곡선기하에서의 고해상도 바이스태틱 SAR 영상생성에 대한 연구 Byung-Soo Kang, Kiwoong Lee 강병수, 이기웅 J. Korean Inst. Electromagn. Eng. Sci. 2022;33(4):323-332. https://doi.org/10.5515/KJKIEES.2022.33.4.323 HTML PDF PubReader

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TUTORIAL & REVIEW Frequency Interference, Analysis Method, and Application Examples of Sub-GHz Frequency Band 주파수 간섭의 이해, 분석 방법, Sub-GHz 주파수대역 적용 사례 Hyungoo Yoon, Byung-Jun Jang 윤현구, 장병준 J. Korean Inst. Electromagn. Eng. Sci. 2021;32(1):1-9. https://doi.org/10.5515/KJKIEES.2021.32.1.1 HTML PDF PubReader Last 3 months views: 615	특집논문/SPECIAL EDITIONS Deep-Learning-Based Automatic Modulation Classification Using Imaging Algorithm 이미지화 알고리즘 및 딥러닝을 이용한 자동 변조 분류 Ji-Yeon Park, Dong-Ho Seo, Hae-Woon Nam 박지연, 서동호, 남해운 J. Korean Inst. Electromagn. Eng. Sci. 2021;32(4):328-333. https://doi.org/10.5515/KJKIEES.2021.32.4.328 HTML PDF PubReader Last 3 months views: 543
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단편논문/SHORT PAPER Design of Metal-Oxide-Metal Capacitors in a 65-nm CMOS Process 65-nm CMOS 공정을 이용한 MOM 캐패시터 설계 및 분석 Kwangwon Park, Sanggeun Jeon 박광원, 전상근 J. Korean Inst. Electromagn. Eng. Sci. 2019;30(10):846-849. https://doi.org/10.5515/KJKIEES.2019.30.10.846 HTML PDF PubReader Last 3 months views: 518	논문/REGULAR PAPERS Design of Tile-Type Rx Phased-Array Antenna for Ku-Band Satellite Communications Ku 대역 위성통신용 타일형 수신 위상배열 안테나의 설계 Taehwan Joo, Kichul Kim, Jongwoo Seo 주태환, 김서종, 종우 J. Korean Inst. Electromagn. Eng. Sci. 2019;30(9):702-711. https://doi.org/10.5515/KJKIEES.2019.30.9.702 HTML PDF PubReader Last 3 months views: 438

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논문/REGULAR PAPERS Development of Modeling & Simulation Tool for Long Range Radar Considering Operational Environment in Time Domain 시간 기반의 운용환경을 고려한 장거리 레이다 M&S 도구 개발 Myung-Hoon Park, Hyun-Seung Kim, Woo-Joong Jeon, Seung-Ki You, Se-Woong Kwon, Hyun-Wook Moon, Ki-Won Lee 박명훈, 김현승, 전우중, 유승기, 권세웅, 문현욱, 이기원 J. Korean Inst. Electromagn. Eng. Sci. 2019;30(7):591-602. https://doi.org/10.5515/KJKIEES.2019.30.7.591 HTML PDF PubReader Cited by 6	단편논문/SHORT PAPER Analysis of Radar Cross Section of the Integrated Mast Module for Battleship 함정용 통합 마스트의 레이다 단면적 분석 Hokeun Shin, Seokgon Lee, Dongmin Park, Jinwoo Shin, Myungsoo Chung, Sanghyun Park, Yong Bae Park 신호근, 이석곤, 박동민, 신진우, 정명수, 박상현, 박용배 J. Korean Inst. Electromagn. Eng. Sci. 2017;28(7):584-587. https://doi.org/10.5515/KJKIEES.2017.28.7.584 HTML PDF PubReader Cited by 6
논문/REGULAR PAPERS Non-Foster Matching Circuit Design to Improve VHF- and UHF-Band Small Antenna Impedance Matching VHF 및 UHF 대역 소형 안테나 매칭성능 개선을 위한 비 포스터 정합회로 설계 Jong-Gyu Go, Jae-Young Chung 고종규, 정재영 J. Korean Inst. Electromagn. Eng. Sci. 2018;29(3):159-166. https://doi.org/10.5515/KJKIEES.2018.29.3.159 HTML PDF PubReader Cited by 5	논문/REGULAR PAPERS Design of Tile-Type Rx Phased-Array Antenna for Ku-Band Satellite Communications Ku 대역 위성통신용 타일형 수신 위상배열 안테나의 설계 Taehwan Joo, Kichul Kim, Jongwoo Seo 주태환, 김서종, 종우 J. Korean Inst. Electromagn. Eng. Sci. 2019;30(9):702-711. https://doi.org/10.5515/KJKIEES.2019.30.9.702 HTML PDF PubReader Cited by 5
논문/REGULAR PAPERS Performance Analysis of a LoRa Device on Duty Cycle Local Regulation of Korean RFID/USN Frequency Band 국내 RFID/USN 주파수 대역의 Duty Cycle 기술기준 하에서 LoRa 기기의 성능 분석 Hyungoo Yoon, Jungsun Um, Byung-Jun Jang 윤현구, 엄중선, 장병준 J. Korean Inst. Electromagn. Eng. Sci. 2017;28(2):113-119. https://doi.org/10.5515/KJKIEES.2017.28.2.113 HTML PDF PubReader Cited by 5	단편논문/SHORT PAPER Implementation of Real-Time Direction Finding System Using Time-Modulated Array with Two Antenna Elements and One USRP 2개의 안테나 소자를 갖는 Time-Modulated Array와 하나의 USRP를 이용한 실시간 방향탐지 시스템의 구현 Sangjoon Lee, Hyungoo Yoon, Hosung Choo, Byung-Jun Jang 이상준, 윤현구, 추호성, 장병준 J. Korean Inst. Electromagn. Eng. Sci. 2017;28(4):347-350. https://doi.org/10.5515/KJKIEES.2017.28.4.347 HTML PDF PubReader Cited by 5
논문/REGULAR PAPERS Correction of Continuous Motion Effects for Airborne FMCW-SAR System 항공기 기반 FMCW-SAR 시스템의 연속이동효과 보정 Ji-hwan Hwang, Jungkyo Jung, Duk-jin Kim, Jin-Woo Kim, He-Sub Shin, Jae-Woo Ok 황지환, 정정교, 김덕진, 김진우, 신희섭, 옥재우 J. Korean Inst. Electromagn. Eng. Sci. 2017;28(5):410-418. https://doi.org/10.5515/KJKIEES.2017.28.5.410 HTML PDF PubReader Cited by 5	논문/REGULAR PAPERS Performance Analysis of Quad-pol SAR System for Wide-Swath Operation Mode 광역관측 운용 모드에 대한 Quad-pol SAR 시스템의 성능 분석 Jung-Hwan Lim, Seong Sik Yoon, Jae-Wook Lee, Taek-Kyung Lee, Sang-Burm Ryu, Hyeon-Cheo Lee, Sang-Gyu Lee 임정환, 윤성식, 이재욱, 이택경, 유상범, 이현철, 이상규 J. Korean Inst. Electromagn. Eng. Sci. 2019;30(2):141-151. https://doi.org/10.5515/KJKIEES.2019.30.2.141 HTML PDF PubReader Cited by 4