Ku 대역(12~18 GHz)은 주로 장거리 위성 통신 및 레이다에 활용된다. 장거리 통신에서는 신호의 세기가 약하므로, 송/수신단의 손실을 줄이는 것이 중요하다. 본 논문에서는 15.7~16.7 GHz에서 동작하는 저손실 소형 4×4 버틀러 매트릭스 (Butler matrix) 구조를 제안하였고, 이를 설계 및 측정하였다. 저손실 특성 구현을 위하여, 서스펜디드 스트립라인(suspended stripline)을 기반으로 전송선로를 설계하였다. 또한, 소형화 구현을 위하여, 버틀러 매트릭스 내부 회로를 100 Ω 시스템으로 설계하고, 입/출력단을 50 Ω으로 정합하였다. 최적화 설계를 통하여 제작된 버틀러 매트릭스 회로의 크기는 45×22×2.3 mm이며, 동작 주파수 대역 내에서 측정된 삽입 손실, 단자 간 격리도, 각 단자의 반사 손실은 각각 1.36 dB(커넥터 손실 포함), 20.5 dB, 15.3 dB로 시뮬레이션 성능과 유사한 성능을 보였다. 개발된 4×4 버틀러 매트릭스는 1×4 선형 배열 안테나의 저손실 빔 스위칭 회로로 활용할 수 있을 것이다.
KSP Keywords
18 GHz, butler matrix, suspended stripline
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