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학술지 Microwave Orbital Angular Momentum Mode Generation and Multiplexing Using a Waveguide Butler Matrix
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저자
이왕주, 홍주연, 강민수, 김봉수, 김광선, 변우진, 송명선, 조용희
발행일
201706
출처
ETRI Journal, v.39 no.3, pp.336-344
ISSN
1225-6463
출판사
한국전자통신연구원 (ETRI)
DOI
https://dx.doi.org/10.4218/etrij.17.0115.1100
협약과제
15MR3700, (통합)모바일 빅뱅 시대의 주파수 효율 개선 핵심 기술 개발, 최형도
초록
In this paper, we propose a convenient microwave orbital angular momentum (OAM) mode generation and multiplexing method operating in the 18 GHz frequency band, based on a 2 × 2 uniform circular array and a 4 × 4 Butler matrix. The three OAM modes -1, 0, and +1 were generated and verified using spatial S-parameter measurements; the measured back-to-back mode isolation was greater than 17 dB in the full 17 GHz to 19 GHz range. However, the radiated OAM beam centers were slightly dislocated and varied with both frequency and the mode index, because of the non-ideal characteristics of the Butler matrix. This resulted in mode isolation degradation and transmission distance limitations.
키워드
18 GHz, Beam center mismatch, Butler matrix, Mode isolation, Mode multiplexing, Orbital angular momentum
KSP 제안 키워드
17 GHz, 18 GHz, GHz range, Mode isolation, Non-ideal, OAM modes, Orbital angular momentum mode, S-parameter measurements, Transmission distance, back-to-back, butler matrix
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