The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Design and Fabrication of a Minimum Insertion Loss Parallel-Coupled-Line-Filter for the Suppression of LO Harmonics

최소 삽입 손실을 갖는 국부 발진기 고조파 제거를 위한 병렬 결합 전송 선로 대역 여파기의 설계 및 제작

  • Kim, Hyun-Mi (Department of Radio Science and Engineering, Chungnam National University) ;
  • Yang, Seong-Sik (Department of Radio Science and Engineering, Chungnam National University) ;
  • Oh, Hyun-Seok (Department of Radio Science and Engineering, Chungnam National University) ;
  • Yeom, Kyung-Whan (Department of Radio Science and Engineering, Chungnam National University)
  • Published : 2007.05.31
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Abstract

In this paper, we present the design procedure of BPF(Band Pass Filter) for the suppression of LO(Local Oscillator) harmonics. The required suppression at given harmonics is the key issues in such a filter design, while the bandwidth and the suppression of the unwanted signals are more important in the conventional RF filter design. In LO filter design the bandwidth is used for the minimization of the insertion loss for the desired signal. In addition, we propose the novel tuning procedure based on Momentum to consider the unknown parasitic effects, which usually are not included in the circuit design step and results in undesirable and frustrating tuning after fabrication.

일반적인 여파기는 대역폭과 원하지 않는 신호들의 억압이 더 중요한 반면, 국부 발진기 여파기의 경우, 차단 주파수에서의 억압이 중요한 척도가 되며, 이 때 대역폭은 통과 대역 주파수에서 삽입 손실을 최소화하도록 설계한다. 본 논문에서는 이러한 특수성을 고려한 대역 여파기의 설계 절차를 보였다. 또한, 대역 여파기 제작 시 알 수 없는 기생 성분으로 인해 원하지 않는 결과를 야기시켜 제작 후의 조정이 이루어지게 된다. 따라서 이러한 문제점을 고려하여 Momentum에 근거한 제작 이전의 설계적인 조정 절차를 제시하였다.

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