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하도훈,김동일,Ha, Do-Hoon,Kim, Dong-Il 한국항해항만학회 2001 한국항해학회지 Vol.25 No.2
CATV(Cable Television) 시스템용 집중정수형 방향성 결합기의 새로운 해석법을 제안하였다. 본 논문에서는 결합선로형 방향성결합기에 대한 우·기 모드 해석법을 변성기형 방향성 결합기에 적용하였다. 측정된 우·기 모드 반사계수만을 사용하여 구한 S-파라미터의 결과와 계산치를 비교함으로서 제안된 해석법의 타당성을 입증하고, 제안된 해석법을 적용하여 설계·제작한 신호분기기는 5 MHz ∼ 4,000 MHz까지 광대역화 됨을 보였다. A new analysis method of lumped-element directional coupler for CATV was proposed, where the even-and odd-mode theory for a symmetrical coupled-line directional coupler was applied to a transformer-type directional coupler. In addition, the tap-offs were analyzed by the proposed theory, which are widely used in CATV (Cable Television) systems. By comparing the calculated results for S-parameters results to the measured ones using only the even-and odd-mode reflection coefficients, the validity of the proposed analysis method was confirmed. Then, it was clearly shown that the tap-off has very wide bandwidth from 5 MHz to 4,000 MHz by adopting the proposed theory.
CATV전송회로의 최적.광대역 설계 및 제작에 관한 연구
김동일(Dong Il Kim),김태균(Tae-Gyun Kim),하도훈(Do-Hoon Ha),정세모(Se-Mo Chung) 한국항해항만학회 1994 한국항해항만학회 학술대회논문집 Vol.3 No.-
The broadband Power Splitters and Tap-Offs are needed to transmit a number of channels of signals with the high quality signals. In this paper, the design theories and analysis of the theoretical frequency characteristics of the Wilkinson's Power Splitters and Tap-Offs are reviewed. Then it has been showned that the theoretical frequency characteristics of the proposed compensated Wilkinson's Power Splitter and Tap-Off are improved much in comparison with the prototype Wilkinson's Power Splitter and conventional weakely-coupled Tap-Off. Furthermore, the measured results of frequency characteristics for the fabricated circuits show agreement with the theoretical results, and hence the validity of the proposed design and analysis methods has been confirmed.