Lumped/Distributed Hybrid Element Directional Coupler with Reduced Size Based on Parallel Coupled-Line Theory

평형결합선로 이론을 이용한 소형화된 집중/분포소자 방향성 결합기

  • 김영태 (순천향대학교 정보기술공학부) ;
  • 박준석 (순천향대학교 정보기술공학부) ;
  • 정명섭 (국민대학교 전자공학부) ;
  • 임재봉 (국민대학교 전자공학부)
  • Published : 2002.11.01


In this paper, we have designed a small size lumped/distributed hybrid element directional coupler using parallel coupled-line theory. a hybrid lumped equivalent circuit for a conventional parallel directional coupler is proposed. The equivalent circuit and design formula for the presented lumped element coupler are derived based on the even- and odd-mode properties of a parallel-coupled line. By using the derived design formula, we have extracted design parameters and designed the 3㏈ and 10㏈ small size lumped element directional couplers at the center frequency of 2Ghz. Excellent agreements between design theory and simulation on the designed directional couplers show the validity of this paper.