A compact bandpass filter with enhanced stopband characteristics by an asymmetric cross-shape defected ground structure

Han Jan Chen, Tsung Hui Huang, Chin Sheng Chang, Lih Shan Chen, Jui Hong Horng, Yeong Her Wang, Mau Phon Houng

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

In this paper, we present an effective technique to enhance stopband bandwidth for a bandpass filter by using an asymmetric, cross-shape defected ground structure (CSDGS). A single CSDGS can provide a higher attenuation rate near passband and broader stopband bandwidth. Moreover, with the asymmetric CSDGS, two different resonant frequencies can be excited and controlled independently, resulting in synthesizing a passband. The synthesized bandpass filter can be modeled by parallel LC resonant circuits in connection with T-networks. The bandwidth and insertion loss of this bandpass filter at 4.2 GHz is 28.6% and -1.44 dB, respectively, and 20 dB rejection in the stopband is up to four times the central frequency. All the synthesized bandpass filters have been measured and are in good agreement with simulated results.

Original languageEnglish
Pages (from-to)2183-2187
Number of pages5
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume53
Issue number11
DOIs
Publication statusPublished - 2006 Nov 1

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering

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