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 of A Narrow Bandpass Filter with Wideband Harmonic Suppression Using Hairpin Step Impedance Resonators

광대역의 고조파 억제가 가능한 헤어핀 SIR을 사용한 협대역 통과 여파기 설계

  • Park, Ju-Seong (School of Electronics Engineering, Kyungpook National University) ;
  • Mohyuddin, Wahab (School of Electronics Engineering, Kyungpook National University) ;
  • Choi, Hyun-Chul (School of Electronics Engineering, Kyungpook National University) ;
  • Kim, Kang-Wook (School of Electronics Engineering, Kyungpook National University)
  • Received : 2017.11.29
  • Accepted : 2018.03.13
  • Published : 2018.03.31
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Abstract

This paper proposes a new design method for narrow bandpass filters using two cascaded hairpin step impedance resonators (SIRs) with wideband harmonic suppression. The proposed bandpass filter utilizes a suspended strip line (SSL) to maximize the characteristic impedance ratio, thereby maximizing the harmonic suppression bandwidth. As an example of the proposed design method, the SSL bandpass filter with a center frequency of $f_0=1.4GHz$ and fractional bandwidth of 5 % was implemented, and proved to suppress harmonics up to $7.5f_0$ with a passband insertion loss of approximately -0.9 dB. This result implies that the proposed SSL narrow bandpass filter (NBPF) can suppress the harmonic bandwidth more than two times as compared with the filter design on a microstrip line (MSL).

본 논문에서는 4~6 %의 협대역 필터를 구현함에 있어서 광대역으로 고조파 성분을 억제하기 위하여 suspended-strip 선로 상에 2개의 헤어핀 계단형 임피던스 공진기 구조를 구현한 새로운 설계법을 제시하였다. 제안된 협대역 필터의 구현의 예로, 중심주파수 $f_0=1.4GHz$에서 5 %의 대역폭의 협대역 필터를 구현하였고, $7.5f_0$까지 광대역 고조파 억제 대역을 구현할 수 있음을 보였다. 이 결과는 기존 마이크로스트립 선로를 사용한 협대역 필터 설계법에 비해 2배 이상 넓은 고조파 억제가 구현 가능함을 입증한 것이며, 삽입손실 또한 0.9 dB로 우수한 특성을 얻었다.

Keywords

References

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