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A Study of Center Longitudinal Shunt-Series Coupling Slot Fed by Asymmetric Compound Iris for Waveguide Slot Coupler

도파관 슬롯 커플러용 비대칭 복합 아이리스에 의해 급전되는 중심 종방향 션트-시리즈 결합 슬롯에 관한 연구

  • Kim, Byung-Mun (Division of IT Cooperative Systems, Gyeongbuk Provincial College) ;
  • Ko, Ji-Hwan (School of Electronics Engineering, Kumoh National University of Technology) ;
  • Cho, Young-Ki (School of Electronics Engineering, IT College, Kyungpook National University)
  • 김병문 (경북도립대 IT특약 계열) ;
  • 고지환 (금오공과대학교 전자공학부) ;
  • 조영기 (경북대학교 전자공학부)
  • Received : 2013.02.19
  • Accepted : 2013.05.31
  • Published : 2013.06.30

Abstract

This paper proposes a new coupling element of microwave slot coupler for designing waveguide slot array which can reduce the effect of undesired higher order mode coupling between coupling and radiating slots in the branch waveguide. The proposed device is composed of a centered longitudinal shunt-series coupling slot at the center of broad wall shared by two crossed rectangular waveguides and an asymmetric compound iris that excites the coupling slot. We first have obtained scattering parameters for the proposed coupler by use of EM S/W tool HFSS and then extracted the parameters of T- network equivalent circuit for the coupling slot. We also have analyzed the resonant properties such as resonant length and normalized admittance by changing the geometrical dimensions. The measured results for the fabricated coupler with short-circuited block ${\lambda}_g/4$ away from the coupling slot are well agreed with the simulated ones.

본 논문에서는 도파관 슬롯 배열 안테나 설계 시 분기 도파관 내에서 결합 슬롯과 복사 슬롯 간의 원하지 않는 고차 모드 결합을 줄일 수 있는 슬롯 커플러용 결합 요소를 제안하였다. 제안된 소자는 수직 교차하는 두 도파관이 공유하는 도파관 광벽에 위치한 중심 종방향 션트-시리즈 결합 슬롯과 이를 여기시키는 비대칭 복합아이리스로 구성된다. 먼저 HFSS를 사용하여 커플러 구조의 산란 계수를 구하고, 결합 슬롯의 T - 회로망 등가 회로의 파라미터를 추출하였다. 또한, 소자의 구조적인 치수를 변화시키면서 공진 길이 및 정규화 어드미턴스와같은 공진 특성을 분석하였다. 결합 슬롯으로부터 ${\lambda}_g/4$ 떨어진 단락 블록을 갖는 커플러를 설계 제작하여 측정한 실험 결과는 모의실험 결과와 잘 일치하였다.

Keywords

References

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