THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2015 Jan.; 26(1), 113118. http://dx.doi.org/10.5515/kjkiees.2015.26.1.113 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) A Retro-Directive Array System for Reduction of Electromagnetic Wave Reflection 하정제 장성훈 이용식 Jungje HaSunghoon Jang*Yongshik Lee 요약,...,. 2 2,. 26 db. Abstract In this paper, a cancellation technique for electromagnetic waves is realized based on a retrodirective antenna array system. The system re-transmits a signal to the direction of the incoming signal, with the same frequency and opposite phase. For the experimental verification, a 2 2 retrodirective array system is designed and fabricated. Experimental results for a metallic cylinder show as much as 26-dB reduction in reflection. Key words: Active Cancellation, Radar, Retrodirective Array, Phase Conjugation, Mixer, RCS. 서론 (retrodirective array) [1]. (Echo) [2][4]. RF. [5].. (Department of Electronical and Electronic Engineering, Yonsei University) *(Agency for Defense Development) Manuscript received October 31, 2014 ; Revised November 24, 2014 ; Accepted December 11, 2014. (ID No. 20141031-090) Corresponding Author: Yongshik Lee (e-mail: yongshik.lee@yonsei.ac.kr) c Copyright The Korean Institute of Electromagnetic Engineering and Science. All Rights Reserved. 113
THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 1, Jan. 2015. 그림 1. Fig. 1. Application of retrodirective array system for active cancellation. [6], [7]., [8]..,. 2 2,. 1, (RCS). S 26 db.. 본론 2-1 병렬믹서기반위상공액배열시스템 2. 2(a) (a) (a) Retro-directive characteristics of phase conjugation (b) (b) Proposed phase-conjugation system based on parallel mixer 그림 2. Fig. 2. Operation principle of active cancellation system based on phase conjugation.. RX TX, [1]. 2(b),,.,. RF IF RF-IF., 114
, [7]. [9].. IF IF A IF B IF A IF B. A IF A RF IF B B RF (2) A R F B LO A LO B LO B R F A leak B leak (1) (2a) (2b) A, LO. A leak B leak. R F, LO, leak 180, (2). A IF cosr F RF l eak cos R F RF cosrf (3a) B IF cosr F RF cosrf leak cos RF RF (3b) (1) (3). RF LO IF cos R F R F cos R F R F (4) IF R F. IF. R F LO IF R F R F cos IF t IF (5) (5) RF-IF IF R F.. (5) (4) 그림 3. 2 2 Fig. 3. Proposed 2 2 retrodriective array system. 115
THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 1, Jan. 2015.,. 2(b) 3. 2, [10]. 180,. 2-2 병렬믹서기반역지향배열시스템설계 2.25 GHz.,, 2 2.,. Mini-circuit SIM-83+, Hitttie HMC- 311ST89 HMC414MS8G (Gain block) (Power amplifier). 3, 4 Taconic RF-35( =3.5, h=0.51 mm). S 45 db. 5(a), [11].. 3.04 mm RF-35 그림 4. Fig. 4. Photograph of fabricated system. (a) (a) Photograph of fabricated antenna (b) (b) Frequency response (c) 2.25 GHz H-plane (c) H-plane gain @ 2.25 GHz 그림 5. Fig. 5. Microstrip patch antenna and measured results. 116
, 65 65 mm 2. 5(b) 2.25 GHz, 10-dB 110 MHz 5.86.4 dbi. 5(c) 2.25 GHz H-plane.,., 3. 3 Analog device phase detector(ad8302) Hitttie (HMC928LP5E). 1 2. 0 RF RF. R F.. 2-3 금속원통에대한능동상쇄실험결과 6. 2.25 GHz dbsm 22 cm, 36 cm. 2.25 2.3 GHz. 1, 26 db. 표 1. Table 1. Reflection levels before and after active cancellation. 2.25 GHz 42.6 dbm 68.9 dbm 26.3 db 2.30 GHz 42.9 dbm 66.8 dbm 23.9 db 그림 6. Fig. 6. Mono-static experimental setup for metallic cylinder. RCS,,.,, 60 MHz.. [12].. 결론,.,. 2 2., 26 db.. References [1] C. Y. Pon, "Retrodirective array using the heterodyne 117
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