• Title/Summary/Keyword: Asymmetric Compound Iris

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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;Ko, Ji-Hwan;Cho, Young-Ki
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.6
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    • pp.586-594
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    • 2013
  • 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.