THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jun.; 27(6),

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1 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jun.; 276), ISSN Print)ISSN X Online) Near-Field Rx-Measurement for Active Phased Array of Digital Radar Using Calibration Path 유제우 채희덕 박종국 임재환 김덕환 진형석 김한생 Je-Woo YuHeeduck ChaeJongkuk ParkJae-Hwan LimDuckhwan KimHyoung-Seog JinHan-Saeng Kim 요약,,.. X-.,. Abstract In this paper, the method is proposed that the equivalent result can be obtained by compensating the variation of gain and phase in the comparison with the result of near-field measurement which is obtained in the steady state, although the gain and phase variation of rx-channels occurred in the near-field rx-measurement of digital active phased array antenna. The proposed concept has the time section for monitoring the state of the rx-channels through the calibration path in the measurement timeline, and is the method for compensating the variation of state. For validating the proposed method, the fabricated X-band digital active phased array antenna and the planar near-field measurement facility is utilized. The proposed method is validated in the comparison with the compensated pattern which the unstable state of rx-channels is calibrated and the reference pattern obtained under the steady state of the rx-channels. Key words : Digital Radar, Digital Beam Forming, Active Phased Array, Near-Field Measurement. 서론.. LIG)LIGNex1) Manuscript received April 18, 2016 ; Revised May 30, 2016 ; Accepted June 16, ID No ) Corresponding Author: Jongkuk Park c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved.

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3 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 6, Jun 그림 1. Fig. 1. The block diagram and signal flow of the near-field rx-measurement. 그림 3. Fig. 3. The block diagram and signal flow of the proposed near-field rx-measurement. 그림 2. Fig. 2. The timeline concept of the near-field rx-measurement. 그림 4. Fig. 4. The timeline concept of the proposed near-field rx-measurement..,,, 506

4 .. 제안한근접전계수신시험 3-1 시험구성및방법 3, , 2 4,,., us,. 3-2 보정기능을이용한보상방법 1) 2).,,,,,,,. 1) 2),. /.. 제안한방법적용유무에따른시험결과 X-.,.., ,. 5 6, 9,000 13,000, db, 20., 18 2 db, 30.,

5 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 6, Jun 그림 5. Fig. 5. The gain variation of rx-channels during the nearfield measurement. 그림 18 Fig. 7. The gain comparison of measured azimuth rx-channel #18. 그림 6. Fig. 6. The phase variation of rx-channels during the nearfield measurement.. /. Ref, CompOn 5 6. CompOff CompOn.,, 그림 18 Fig. 8. The phase comparison of measured azimuth rx-channel # 결론 508

6 그림 13 Fig. 9. The gain comparison of measured azimuth rx-channel #13. 그림 13 Fig. 10. The phase comparison of measured azimuth rx-channel #13....,.,.. References [1] E. Grorud, C. Mehl, C. Renard, E. Semmler, and K. Weidmann, "Design and measurement of an active array antenna for an airborne X-Band SAR/MTI radar", Proceedings of The European Conference on Antennas and PropagationEuCAP 2006), Nice, France, Nov [2] W. Haselwander, M. Uhlmann, S. Wustefeld, and M. Bock, "Measurement on an active phased array antenna on a near-field range and an anechoic far-field chamber", 31st European Microwave Conference, London, Sep [3] J. J. H. Wang, "An examination of the theory and practices of planar near-field measurement", IEEE Trans. Antennas Propagat., vol. 36, pp , Jun [4],,,,, " ",, 2212), pp ,

7 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 6, Jun 유제 우 년 8월: 충남대학교 정보통신공학부 공학사) 년 2월: 충남대학교 전파공학과 공학 석사) 2008년 2월 현재: LIG넥스원 레이다연구 센터 선임연구원 [주 관심분야] 능동 위상 배열 안테나 설 계, 능동 위상 배열 레이더 시스템 채희 덕 년 2월: 서울대학교 전기컴퓨터공학 부 공학사) 2001년 2월: 서울대학교 전기컴퓨터공학 부 공학석사) 2008년 2월: 서울대학교 전기컴퓨터공학 부 공학박사) 2007년 3월 현재: LIG넥스원 수석연구원 [주 관심분야] 위상 배열 안테나 설계, 능동 위상 배열 안테나 시스템, 레이더 시스템, 초고주파 수동 회로 설계 및 전자파 수치 해석 임재 환 년 2월: 연세대학교 전기전자공학과 공학석사) 년 2월 2008년 1월: 삼성전자 무선 사업부 2008년 2월 현재: LIG넥스원 레이다연구 센터 선임연구원 [주 관심분야] 초고주파 능동 회로 및 송 수신기 설계/ 능동 위상 배열 레이더 시스템 김덕 환 박종 국 년 월 서울대학교 전자공학과 공학 사 년 월 서울대학교 전자공학과 공학 석사 년 월 서울대학교 전기컴퓨터공학 부 공학박사) 년 월 현재: LIG넥스원 수석연구 원 [주 관심분야] 위상 배열 안테나 설계, 능동 위상 배열 안테나 시스템, 레이더 시스템, 초고주파 수동 회로 설계 및 전자파 수치 해석 : ) : ) : 년 2월: 경희대학교 전자정보학부 공학사) 년 2월 현재: LIG넥스원 레이다연 구센터 선임연구원 [주 관심분야] 디지털하드웨어 설계, 능 동 위상 배열 시스템 등 진형 석 년 8월: 광운대학교 전파공학 전공 공학석사) 년 8월 현재: LIG넥스원 수석연구 원 [주 관심분야] 초고주파 능동 회로 및 송수신기 설계/ 능동 위상 배열 레이 다 시스템 및 TRM

8 2002 2: ) : LIG [ 주관심분야 ],, 511

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