Compact microstrip coupled-line bandpass filter with four transmission zeros

Chao Huang Wu, Yo Shen Lin, Chi Hsueh Wang, Chun Hsiung Chen

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


A compact coupled-line bandpass filter with multiple capacitive cross-couplings to create four transmission zeros is proposed. The locations of transmission zeros can be adjusted by varying the values of cross-coupled capacitances so as to improve the filter selectivity. The proposed filter is based on one-eighth-wavelength (λ/8) coupled-line sections and quarter-wavelength (λ/4) resonators, thus it occupies only half of the circuit area comparing with the conventional coupled-line bandpass filters. Specifically, a fourth-order microstrip coupled-line bandpass filter centered at 2.46 GHz with a 3-dB bandwidth of 10.2% and four transmission zeros is implemented and examined.

Original languageEnglish
Pages (from-to)579-581
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number9
StatePublished - Sep 2005


  • Bandpass filter
  • Coupled-line
  • Microstrip
  • Multiple cross-couplings


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