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김기록(Ki-Rock Kim),주병국(Byung-kook Joo),방재훈(Jae-Hoon Bang),안병철(Bierng-Chearl Ahn),전종훈(Jong-Hun Chun) 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.6
In this paper, we present the design procedure of a stepped bend which can be adapted to multi-layer waveguide structures. Optimum dimensions of the bend are obtained using a commercial software for the center frequency ranging from 1.1-1.9 times the waveguide cutoff frequency. To verify the accuracy of the proposed method, we design, fabricate, and measure a bend operating at 30-40㎓. The fabricated bend shows a good agreement with simulation and has reflection coefficient less than -24㏈ and a transmission coefficient greater than -0.2㏈.
박진석(Jae-Hoon Bang),김기록(Ki-Rock Kim),이제선(Jea-sun Lee),방재훈(Jae-Hoon Bang),안병철(Bierng-Chearl Ahn),전종훈(Jong-Hoon Chun) 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.6
In this paper, we design, fabricate and test a 35㎓ waveguide monopulse comparator for use in a tracking radar. The proposed comparator is consisted of four 180° E-plane ring hybrid couplers placed on a single plane. The comparator has four input ports mating with a monopulse feed horn and three output ports corresponding to the sum, azimuth and elevation difference channels. Waveguide sections and bends are utilized in connecting input and output waveguides to the comparator. The whole structure is fabricated in three pieces using the widely-used split-block waveguide machining techniques. Measurements of the fabricated comparator show reflection coefficient less than -20㏈, amplitude balance better than ±0.6㏈, phase balance better than ±5° at all channels, which are in good agreement with simulations.