본 논문에서는 저위상잡음 특성을 갖는 Ka-band 위성 중계기용 국부발진기의 우주인증모델(EQM)을 개발하였다. 국부발진기의 루프대역 밖의 위상잡음을 개선하기 위하여 유전체 공진기와 결합하는 마이크로스트립 라인을 고임피던스 인버터로 설계하여 전압제어 발진기를 설계하였다. 또한 기구물의 구조해석 및 기판의 열해석이 수행되었으며 설계된 우주인증모델의 국부발진기는 전기적 시험 및 환경시험을 거쳐 EQM 수준의 Ka-band용 위성중계기에 탑재되었다. 제작된 국부발진기는 52 dBc 이상의 고조파 억압특성을 가지고 있으며 1.3 W 이하의 낮은 전력을 요구한다. 15∼ +65 의 온도변화에서 위상잡음은 101.33 dBc/Hz @10 kHz와 114.33 dBc/Hz @100 kHz의 우수한 특성을 나타내며 출력전력은 14.0±0.17 dBm을 얻었다.
KSP Keywords
ka-band
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