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도한주,권건안,김희황,설우형,이희재,박민원,안달 순천향대학교 부설 산업기술연구소 2015 순천향 산업기술연구소논문집 Vol.21 No.2
In this paper, we propose a branch line coupler using open stub. The conventional branch line coupler needs large area due to the structural characteristic. In order to solve this problem, we convert distributed elements to lumped elements, and the inductor in the lumped elements is analyzed as the distributed elements, reducing the 90 degree of electrical length as 45 degree. The area of the proposed branch line coupler is decreased to 56% as the capacitor is realized as open stub. The compact branch line coupler is confirmed by fabrication, and the measurement result of it is similar to that of the conventional branch line coupler.