A Design of Spurious-Reduced CPW Low-Pass Filter Based on Defected Ground Structure

고조파 제거특성을 갖는 DGS형태의 CPW 저역통과 여파기의 설계

  • No, Jin-Won (Dept. of Electrical and Computer Eng. Microwave lab. Kangwon National University) ;
  • Chin, Kyung-Min (Dept. of Electrical and Computer Eng. Microwave lab. Kangwon National University) ;
  • Hwang, Hee-Yong (Dept. of Electrical and Computer Eng. Microwave lab. Kangwon National University)
  • 노진원 (강원대학교 전기전자정보통신공학부 Microwave 연구실) ;
  • 진경민 (강원대학교 전기전자정보통신공학부 Microwave 연구실) ;
  • 황희용 (강원대학교 전기전자정보통신공학부 Microwave 연구실)
  • Published : 2005.11.05

Abstract

In this paper, Coplanar Waveguide(CPW) low-pass filter with the spurious-reduced is designed by using Defected Ground Structures(DGS). Two different LPF unit cells and DGS pattern are combined to reduce the spurious. In comparison to a conventional step impedance LPF, the size of proposed LPF as 17.2mm*6.8mm is several times smaller. The simulation and measurements confirm that spurious characteristics is presented less than -30dB($S_{21}$) to three times cut off frequency.

Keywords

Spurious;Coplanar Waveguide;Defected Ground Structure;Low-Pass Filter