Stopband Extension of Slow-wave Bandpass Filters Using Ring Resonators

링 공진기를 사용한 저속파 대역통과 여파기의 저지대역 확장

  • 배은규 (경상대학교 컴퓨터정보통신연구소) ;
  • 석창헌 (경상대학교 컴퓨터정보통신연구소) ;
  • 심보환 (경상대학교 컴퓨터정보통신연구소) ;
  • 제영태 (경상대학교 컴퓨터정보통신연구소) ;
  • 이문수 (경상대학교 컴퓨터정보통신연구소)
  • Published : 2003.11.01

Abstract

In this paper, we design a slow-wave bandpass filter that uses a microstrip line periodically loaded with microstrip ing resonators for WLAN(5 GHz). Unlike conventional slow-wave filters, this filter is designed to produce a narrow passband at the fundamental mode of the resonators and provide lower insertion loss than that of parallel- or cross-coupled ring bandpass filters. A PBG(Photonic Band Gap) structure patterned in the ground plane is used to suppress the spurious transmission and extend out-of-band rejections Experimental result shows that the first spurious response in the stopband of the slow-wave bandpass filter can be rejected using a PBG structure.

Keywords