본 논문에서는 X 대역 위성 탑재용 입력멀티플렉서용 채널필터 설계 및 제작 결과에 대하여 언급하였다. 입력멀티플렉서는 콤라인 필터, 전력 분배기, 아이솔레이터 그리고 채널필터로 구성되었다. 채널필터는 협대역의 주파수 선택도를 높이기 위해서 8차 타원 응답형으로 설계를 하였으며, 채널 내에서 군지연의 변화를 최소화하기 위해서 채널필터 자체에 군지연 등화기능을 내장하여 설계하였다. 채널 필터의 무게와 부피를 줄이기 위해서 원통형 공동을 이용한 이중모드 공진기를 사용하였으며, 원통형 도파관의 TE111 모드의 수직과 수평 편파를 이용하였다. 채널필터의 구조는 비대칭 캐노니컬 구조로 설계를 하였고, 입출력 단자는 공동 내부에 프로브를 둔 SMA 커넥터를 사용하였다. 제작 검증 결과 설계 결과와 유사함을 확인하였다. 또한 소형화에 적합하도록 도파관 공진기 대신 콤라인 공진기를 사용할 경우에 대한 전치왜곡 8차 대칭 캐노니컬 구조 필터의 결합 계수를 제시하였다.
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