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

23 Citations (Scopus)
103 Downloads (Pure)


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 the 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 a higher quality factor and wider stopband, compared to that of a square or cylindrical cavity. To validate the design concept, a dual-band BPF prototype, operating at 12.0 and 12.5 GHz with respective bandwidths of 120 and 240 MHz, is implemented by 3-D printing process. The measured results exhibit good agreement with the simulated ones, showing more than 20-dB return losses and 20-dB dual-band isolation.

Original languageEnglish
Pages (from-to)1047-1050
Number of pages4
JournalIEEE Microwave and Wireless Components Letters
Issue number9
Early online date14 May 2021
Publication statusPublished - Sept 2021


  • 3-D printed
  • bandpass filter (BPF)
  • dual band
  • dual mode
  • higher Q
  • spherical cavity resonators

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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