CATV/DBS용 신호분기기의 우ㆍ기 모드 해석법

An Even\ulcornerOdd mode Analysis Method of Tap-Offs for CATV/DBS Systems

CATV, DBS(Direct Broadcasting Satellite), CS(Communication Satellite) 시스템용 신호분기기를 4-port와 3-port등가회로를 사용한 새로운 해석법을 제안하였다 결합선로형 방향성결합기에 대한 우·기 모드 해석법을 도입하여, 변성기형 방향성 결합기에 적용하였다. 시뮬레이션과 실험결과를 비교함으로서 제안된 해석법의 타당성을 입증하였고, 또한 제작된 신호분기기는 제안된 해석법을 적용하여 5 MHz∼4,000 MHz의 광대역화가 되었다.

A new analysis method of Tap-Off for CATV, DBS, CS systems was proposed and investigated by using 4-port and Lport equivalent circuits. As an analysis method the even$.$odd-mode theory for a symmetrical coupled-line directional coupler was introduced, and then it was applied to transformer type directional couple By comparing the results of simulation and measurement, the validity of the proposed analysis method was confirmed. Furthermore, the Tap-off has been broadened from 5 MHz to 4,000 MHz by adopting the propose theory.