본 논문에서는 Ka-대역에서 도파관 형태의 구형 혼, 원형 편파기 및 직선구조 모드변환기가 결합된 혼 안테나의 설계 및 제작에 관하여 서술한다. 원형 편파기는 광대역 특성을 가지는 유전체 타입으로 구형도파관에 $45^{\circ}$ 기울여 삽입하는 구조를 갖으며, 직선구조 모드변환기는 계단식 구조로 동축선으로부터 입력되는 TEM 모드 신호를 도파관의 TE 모드로 변환손실을 최소화 할 수 있도록 설계되었다. 제작된 혼 안테나는 $30.085\sim30.885GHz$에서 동작하며, VSWR < 1.5, Axial ratio < 1.0dB의 특성과 함께, 동작주파수 대역에서 $6.7\sim7.0dBi$의 이득을 갖는다.
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