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A Design of the UWB Bandpass Filter with a Good Performance of the Stopband, and Notched Band in Passband

우수한 차단 대역 특성과 통과 대역 내에 저지 대역을 갖는 UWB 대역 통과 필터 설계

  • An, Jae-Min (Department of Electronic and Computer Engineering, Chonnam National University) ;
  • Kim, Yu-Seon (Department of Electronic and Computer Engineering, Chonnam National University) ;
  • Pyo, Hyun-Seong (Department of Electronic and Computer Engineering, Chonnam National University) ;
  • Lee, Hye-Sun (Department of Electronic and Computer Engineering, Chonnam National University) ;
  • Lim, Yeong-Seog (Department of Electronic and Computer Engineering, Chonnam National University)
  • 안재민 (전남대학교 전자컴퓨터공학과) ;
  • 김유선 (전남대학교 전자컴퓨터공학과) ;
  • 표현성 (전남대학교 전자컴퓨터공학과) ;
  • 이혜선 (전남대학교 전자컴퓨터공학과) ;
  • 임영석 (전남대학교 전자컴퓨터공학과)
  • Published : 2010.01.31

Abstract

In this paper, we designed and fabricated a ultra-wideband(UWB) bandpass filter with a good performance of a stopband, and a notched band in passband. The transformed equivalent circuit of the highpass filter was realized by distributed element. A wide-passband with 3-dB fractional bandwidth of more than 100 % was achieved by using optimum response of the HPF. For improving lower and upper stopband characteristic, a cross coupling between feed lines was employed, which was analyzed by desegmentation technique. In order to reject interference of Wireless LAN and Hyper LAN(5.15~5.825 GHz), the narrow notched(rejection) band was realized by a spurline. The fabricated BPF indicated the passband from 3.1 to 10.55 GHz and the flat group delay of less than 0.94 ns over the entire passband except the rejection band. The filter shown sharp attenuation both inside and outside the band and notched band from 5.2 to 6.12 GHz.

Keywords

Ultra-WideBand(UWB);Bandpass Filter;I/O Cross Coupling;Desegmentation Technique;Spurline

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