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인쇄형 다이폴을 이용한 Ku-대역 원형도파관-동축선 변환부 설계
윤제영(Je-Young Yun),노준우(Joon-Woo Nho),이찬호(Chan-Ho Lee),박영규(Young-Gyu Park),안병철(Bieng-Chearl Ahn) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.7
Circular waveguides are widely used in the realization of reflector-antenna feeds, orthomode transducers, polarizers, filters/multiplexers, and rotary joints. A circular waveguide to coaxial cable transition is often employed to connect a circular waveguide to a transmitter/receiver. This paper presents an in-line circular waveguide to coaxial cable transition employing a printed dipole. The proposed transition consists of a shorted circular waveguide, a microstrip feed line, a microstrip balun, a printed dipole, a parasitic element for wideband operation, and a coaxial probe. Change in the reflection coefficient of the transition versus design parameters is analyzed, from which an optimum design is obtained. Designed transition is fabricated and it reflection coefficient is measured and compared with the simulation. The proposed transition shows reflection coefficient of less than -15dB and higher-order mode levels of less than -20dB at 13.4~17.2GHz.