A Design Method of Multimode Multiband Bandpass Filters

Pengyu Ma, Bin Wei, Jia-Sheng Hong, Zhan Xu, Xubo Guo, Bisong Cao, Linan Jiang

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)
743 Downloads (Pure)


In this paper, a general design method for multiband filters is proposed. First, the frequency and element transformations from a low-pass prototype filter to a practical multiband bandpass filter is derived. Afterwards, formulas for extracting the coupling coefficient k between coupled multimode resonators and the external quality factor Qe are also obtained. Thereafter, the design procedure of coupled multiresonator multiband filters is similar to that of single-band filters. A tri-band microstrip filter with tri-mode resonators is successfully designed with the proposed method and fabricated, which validates this theory.

Original languageEnglish
Pages (from-to)2791-2799
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number6
Early online date29 Mar 2018
Publication statusPublished - Jun 2018


  • Chebyshev filters
  • coupling matrix for filter synthesis
  • Couplings
  • frequency transformation
  • Microwave theory and techniques
  • multibandpass filters
  • multimode resonators.
  • Prototypes
  • Resonant frequency
  • Resonators
  • Topology

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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