Design of Wide-Stopband and Dual-Band Filtering Crossovers Based on Mixed Substrate Integrated Waveguide Cavities

Gang Zhang, Xin Zhou, Kai-Da Xu, Jiquan Yang, Xiaohang Sun, Bin Xu, Kam-Weng Tam, Shuai Feng, Wanchun Tang, Jiasheng Hong

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
69 Downloads (Pure)


This article proposes a new design approach for filtering crossovers featuring wide-stopband and dual-band characteristics based on mixed substrate integrated waveguide (SIW) cavities. The degenerate orthogonal modes in multimode full-mode SIW (FMSIW) square cavities are fully exploited as the cross-unit of dual channels for cross-transmission and good isolation. By developing proper coupling topology between multiple quarter-mode SIW (QMSIW) cavities and the FMSIW cavity, a compact wide-stopband filtering crossover is presented with more than − 20 dB stopband rejection up to 2.11 f0 . In order to construct a dual-band filtering crossover topology which has not been reported before, half-mode SIW (HMSIW) cavities are explored to cooperate with the FMSIW cavity, thus leading to a satisfactory dual-passband crossover response for the first time. To validate the design concept, a wide-stopband and a dual-band filtering crossovers are designed, fabricated, and measured. Results exhibit excellent filtering performance and good channel-to-channel isolations over an ultrawide frequency band.
Original languageEnglish
Pages (from-to)5346-5357
Number of pages12
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number12
Early online date13 Jul 2023
Publication statusPublished - Dec 2023


  • Couplings
  • Dual band
  • Dual-band
  • Electronic mail
  • Filtering
  • Microwave filters
  • Substrates
  • Topology
  • filtering crossover
  • isolation
  • mixed cavities
  • orthogonal mode
  • substrate integrated waveguide (SIW)
  • wide-stopband

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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