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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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A Compact C-Band Semi-Lumped Lowpass Filter with Broad Stopband Using a Chip Inductor

칩 인덕터를 사용하여 광대역 저지 특성을 갖는 소형 C-밴드 Semi-Lumped 저역 통과 여파기

  • Jang, Ki-Eon (School of Electrical Engineering and Computer Science, Kyungpook National University) ;
  • Lee, Gi-Moon (Precision-Guided Munitions System Integration Department, Hanwha Corporation) ;
  • Kim, Ha-Chul (Department of Electrical Engineering, Republic of Korea Naval Academy) ;
  • Choi, Hyun-Chul (School of Electrical Engineering and Computer Science, Kyungpook National University)
  • 장기언 (경북대학교 전자전기컴퓨터학부) ;
  • 이기문 ((주)한화 체계종합부) ;
  • 김하철 (한국해군사관학교 전기전자공학부) ;
  • 최현철 (경북대학교 전자전기컴퓨터학부)
  • Received : 2012.06.26
  • Accepted : 2012.12.05
  • Published : 2012.12.31
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Abstract

The C-band semi-lumped lowpass filter with broad stopband and compact size characteristic using chip inductor is proposed. To provide an additional attenuation pole in stopband by SRF, a separable inductor is added to proposed structure, and it has broad stopband characteristic. The third order elliptic function lowpass filter with chip inductor(L: 9.1 nH, SRF: 5.5 GHz, Q: 25) has insertion loss of 0.38 dB, cutoff frequency of 920 MHz, broad stopband(below 20 dB) of 1.43~7.8 GHz and the size is reduced 37.4 % compared to distributed inductor.

칩 인덕터를 이용하여 넓은 저지 대역과 소형화 특성을 갖는 C-밴드 semi-lumped 저역 통과 여파기를 제안하였다. 칩 인덕터의 자기 공진 주파수(SRF: Self Resonance Frequency) 특성을 유지하기 위하여 추가된 분리형 인덕터와 SRF 특성으로 인해 발생되는 감쇠 폴을 이용하여 광대역 저지 대역과 높은 저지 특성을 얻을 수 있었다. 3차 elliptic function 여파기에 칩 인덕터(L: 9.1 nH, SRF: 5.5 GHz, Q: 25)를 적용한 결과, 마이크로스트립 라인 인덕터로 구현한 여파기보다 크기가 37.4 % 감소하였으며, 삽입 손실이 0.38 dB, 차단 주파수는 920 MHz, 1.43~7.8 GHz의 넓은 저지 대역(20 dB 이하) 특성을 가졌다.

Keywords

References

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