Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Design of a Waveguide Band-Pass Filter Using a Modified H-type Resonant Iris

변형된 H-형 공진 아이리스를 이용한 도파관 대역통과 여파기 설계

  • Park, Kyoung-Je (School of Electronics Engineering, Kyungpook National University) ;
  • Choi, Tae-Ho (School of Electronics Engineering, Kyungpook National University) ;
  • Lee, Jong-Ig (Division of Mechatronics Engineering, Dongseo University) ;
  • Kim, Byung-Mun (Department of Electrical Electronics, Gyeongbuk Provincial College) ;
  • Cho, Young-Ki (School of Electronics Engineering, Kyungpook National University)
  • Received : 2018.01.23
  • Accepted : 2018.01.28
  • Published : 2018.02.28
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Abstract

In this paper, we studied a design method for a band-pass waveguide filter with a modified H-type resonant iris (RI) placed in a thin transverse wall of a rectangular waveguide. The horizontal straight gap at the center of a conventional H-shaped iris is modified to a U-shaped one to increase the equivalent capacitance, and the equivalent inductance is improved by changing the vertical two straight slots into C-shaped ones. From some simulation results for the frequency response of the proposed RI, it was observed that the proposed iris was advantageous for reducing its size and having better cutoff, compared to typical H-shaped one. Equivalent inductance, capacitance, and quality factor of the proposed RI were extracted to analyze its performance. A third-order band pass filter using the proposed modified H-shaped iris was designed and, it was observed that the filter operated in the frequency range of 9.18-9.84 GHz with its insertion loss of 0.3 dB and return loss of 14 dB.

논문에서는 도파관의 얇은 횡단면에 변형된 H-형 아이리스를 배치하여 대역 통과 여파기(bandpass filter; BPF)를 구현하는 방법에 대해 연구하였다. 제안된 소형 공진 아이리스(resonant iris; RI)는 전형적인 H-형 RI 중앙의 수평방향 일자형 간극을 U형으로 변형하여 간극의 등가 커패시턴스를 증가시키고 아이리스의 양측 수직방향 일자형 슬롯들을 C형으로 변형하여 등가 인덕턴스를 증가시킨 구조이다. 제안된 RI와 전형적인 H형 RI의 주파수에 따른 특성을 비교하여 소형화에 유리하고 차단특성이 우수함을 관찰하였다. 제안된 아이리스 구조의 등가 인덕턴스, 등가 커패시턴스, Q 값(quality factor) 등을 추출하여 특성을 분석하였다. 제안된 아이리스 구조를 이용하여 9.5 GHz 대역(9.18-9.84 GHz, 삽입손실 0.3 dB, 반사손실 14 dB)에서 동작하는 3차 BPF를 설계하였다.

Keywords

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