Application of microstrip cavity couplers for wideband bandpass filters

Jui Ching Cheng, Eric S. Li*, Chin Chung Chuang

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

Abstract

This article presents a design for wideband bandpass filters using a microstrip cavity coupler. The broadband nature of the cavity-coupled designs is fully exploited for this application. Two additional circuits are introduced to improve the stopband performance of the cavity-coupled bandpass filter. A prototype design example is presented with its center frequency located at 6.28 GHz. The design has the merits of wide bandwith of more than 140%, flat group delay within the passband, good insertion/return loss, and stopband attenuation of nearly 30 dB up to 30 GHz. The validity of the simulation results is verified experimentally.

Original languageEnglish
Pages (from-to)2814-2817
Number of pages4
JournalMicrowave and Optical Technology Letters
Volume53
Issue number12
DOIs
StatePublished - 12 2011

Keywords

  • bandpass filter
  • cavity coupler
  • wideband

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