3-D Printed Dual-Band Filter Based on Spherical Dual-Mode Cavity

Yuan Chen, Gang Zhang, Jiasheng Hong, Zhengyu Sun, Jiquan Yang, Wanchun Tang, Chunmei Feng

Research output: Contribution to journalArticlepeer-review


A new dual-band bandpass filter (BPF) is designed and fabricated based on a pair of spherical dual-mode resonant cavities using 3-D printing technology. By elaborately introducing three-type metallic posts into each cavity to perturb the degenerated TM101 modes in a reasonable way, a dual-band coupling topology is developed in the design, accordingly. Owing to the cross coupling paths in designed topology, two transmission zeros (TZs) are successfully introduced between the passbands, bringing out a high band-to-band isolation. Even more TZs can also be generated by creating additional internal coupling paths to the presented dual-band coupling topology. Besides, the spherical cavity provides higher quality factor and wider stopband, compared to that of square or cylindrical cavity. To validate the design concept, a dual-band BPF prototype operating at 12.0 GHz and 12.5 GHz with respective bandwidths of 120 MHz and 240 MHz is implemented by 3-D printing process. Measured results exhibit a good agreement with simulated ones, showing better than 20 dB return losses and 20 dB dual-band isolation.

Original languageEnglish
JournalIEEE Microwave and Wireless Components Letters
Publication statusE-pub ahead of print - 14 May 2021


  • 3-D printed
  • Band-pass filters
  • bandpass filter
  • Cavity resonators
  • Couplings
  • Dual band
  • dual-band
  • dual-mode
  • higher Q
  • Microwave filters
  • Passband
  • spherical cavity resonators
  • Topology

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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