Ultra-wideband bandpass filter with improved upper stopband performance using defected ground structure

Jae Kwan Lee, Young Sik Kim

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

A novel ultra-wideband (UWB) bandpass filter (BPF) with improved upper stopband performance using a defected ground structure (DGS) is presented in this letter. The proposed BPF is composed of seven DGSs that are positioned under the input and output microstrip line and coupled double step impedance resonator (CDSIR). By using CDSIR and open loop defected ground structure (OLDGS), we can achieve UWB BPF characteristics, and by using the conventional CDGSs under the input and output microstrip line, we can improve the upper stopband performance. Simulated and measured results are found in good agreement with each other, showing a wide passband from 3.4 to 10.9 GHz, minimum insertion loss of 0.61 dB at 7.02 GHz, a group delay variation of less than 0.4 ns in the operating band, and a wide upper stopband with more than 30 dB attenuation up to 20 GHz. In addition, the proposed UWB BPF has a compact size (0.27λg ∼ 0.29λg, λg: guided wavelength at the central frequency of 6.85 GHz).

Original languageEnglish
Article number5454357
Pages (from-to)316-318
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume20
Issue number6
DOIs
Publication statusPublished - 2010 Jun 1

Keywords

  • Bandpass filter (BPF)
  • Coupled double step impedance resonator (CDSIR)
  • Defected ground structure (DGS)
  • Open loop DGS
  • Ultra-wideband (UWB)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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