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 Wideband Low Pass Filter for Harmonic Suppression Applications

고조파 억제 응용을 위한 광대역 저역 통과 필터 설계

  • Yeo, Junho (School of Computer and Communication Engineering/Information and Communication Research Center, Daegu University) ;
  • Lee, Jong-Ig (Division of Mechatronics Engineering, Dongseo University)
  • Received : 2017.08.22
  • Accepted : 2017.09.05
  • Published : 2018.01.31
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Abstract

In this paper, a design method for a wideband LPF for harmonic suppression applications is investigated. The proposed wideband LPF is comprised of four circular slot pairs with different diameters, which are added symmetrically in the ground plane of a CPW transmission line. Four circular slot pairs act as a defected ground structure and provide a wideband low pass characteristic. The circular slot with the smallest diameter is located at the side of port 1, and the diameter of the circular slot is increased as it goes toward port 2. The low pass characteristics of each circular slot are compared with the proposed wideband LPF. The final designed LPF was fabricated on FR4 substrate, and its characteristics were tested. The measured S11 characteristic was maintained at over -3.3 dB in the frequency range of 1.89-20.00 GHz band, whereas the S21 characteristic was less than -21.4 dB in the frequency range of 2.66-20.00 GHz.

본 논문에서는 고조파 억제 응용을 위한 광대역 저역 통과 필터(low pass filter; LPF)에 대한 설계 방법에 대하여 연구하였다. 제안된 광대역 LPF는 동일면 도파관(coplanar waveguide; CPW)의 접지면에 대칭적으로 추가한 4개의 크기가 다른 원형 슬롯 쌍으로 구성된다. 4개의 원형 슬롯 쌍은 결함접지구조 역할을 하며 광대역 저역 통과 특성을 가진다. 직경이 가장 작은 원형 슬롯이 포트 1 측에 위치하고 포트 2측으로 가면서 직경이 커지는 형태로 배치하였다. 각각의 원형 슬롯의 저역 통과 특성을 제안된 광대역 LPF와 비교하였다. 최종 설계된 LPF를 FR4 기판 상에 제작하고 특성을 실험한 결과, 측정된 S11 특성은 1.89-20.00 GHz 대역에서 -3.3 dB 이상을 유지하였고, S21 특성은 2.66-20.00 GHz 대역에서 -21.4 dB 이하를 유지하였다.

Keywords

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