The Journal of the Korea institute of electronic communication sciences (한국전자통신학회논문지)

Korea Institute of Electronic Communication Science (한국전자통신학회)
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Ultra-wideband BSF Using Multi-stage FSCS

다단 FSCS를 이용한 초광대역 특성의 대역저지 필터

  • Received : 2020.04.09
  • Accepted : 2020.06.15
  • Published : 2020.06.30
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Abstract

In this paper, the analysis of the FSCS (frequency-selected coupling structure) as the coupling coefficient and multi-stage FSCS for enhanced bandstop bandwidth is suggested. The FSCS is composed by the connected coupled-line and open-stub. Basically, the resonance frequency of the FSCS is given by the electrical length of the stub, and the bandwidth is controlled by the coupling coefficient. Multi-stage FSCS is made by addition of another FSCS with the half electrical length. Manufactured bandstop filter using 3 stage FSCS is measured with the stopband of 177.3% and the maximum return loss of 1dB.

본 논문에서는 결합선로와 개방형 스터브를 통해 간단히 구현되는 FSCS의 결합계수에 따른 특성을 분석하고, FSCS로 구현되는 대역저지 필터의 대역저지 대역폭을 향상시키고자 다단의 FSCS를 제안하였다. FSCS는 스터브에 의해 기본 공진 주파수가 결정되며 결합선로의 결합계수에 의해 대역폭을 조절할 수 있다. 논문에서는 결합선로와 스터브의 전기적 길이를 절반으로 하는 FSCS를 추가로 연결하여 다단 FSCS를 구현하였으며, 3단 FSCS로 구성된 대역저지 필터는 저지 대역 177.3% (1.15~12.72GHz)와 저지대역에서의 최대 반사 손실 1dB의 측정 결과를 보였다.

Keywords

References

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