Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Modal Analysis of Loop Coupling Structure in End Launcher Rectangular Waveguide Adapter

엔드론치형 구형도파관 어댑터 내부의 루프결합구조에 대한 모드 해석

  • Kim, Dong-Hyun (Department of Telecommunication Engineering, Cheju National University) ;
  • Jwa, Jeong-Woo (Department of Telecommunication Engineering, Cheju National University) ;
  • Yang, Doo-Yeong (Department of Telecommunication Engineering, Cheju National University)
  • Published : 2008.02.25
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Abstract

In this paper, the loop coupling model for the analysis of end launcher rectangular waveguide adapter are proposed. The formula of input impedance from this model are presented. The influence of propagation mode and higher modes in rectangular waveguide are analyzed and design parameters of the end launcher adapter are investigated. The computational results between the proposed theoretical analysis and the previous papers are compared and are verified by HFSS. The end launcher rectangular waveguide adapter consists of the coupling geometry which is connected the inner conductor of $50{\Omega}$ coaxial line through into the 17.6mm feeding loop in a WR90 commercial waveguide, and the VSWR is maximum 2.0 over operating frequency from 7.5GHz to 10.6GHz.

본 논문에서는 엔드론치형 구형도파관 어댑터 해석을 위하여 루프 결합 모델을 제안하고, 이를 토대로 입력 임피던스의 모드 해석식을 유도하였다. 구형도파관 내의 전파모드와 고차모드들에 따른 입력 임피던스의 영향을 분석하고, 설계변수에 대하여 고찰하였다. 또한 선행 연구에서 제안된 방식과 상용 해석 툴인 HFSS의 해석결과를 바탕으로 제안한 해석식이 타당함을 검증하였다. 제안한 엔드론치형 구형도파관 어댑터는 특성 임피던스 $50{\Omega}$을 갖는 동축선의 내부도체와 WR90 상용도파관내에서 길이가 17.6mm인 급전루프가 연결된 결합구조이다. 이러한 구조에서 앤드론치형 어댑터는 정재파비(VSWR)가 2.0이하인 기준에서 7.5GHz에서 10.6GHz 대역을 갖는다.

Keywords

References

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