A 3-D Printed Lightweight X-Band Waveguide Filter Based on Spherical Resonators

Cheng Guo, Xiaobang Shang, Michael J. Lancaster, Jun Xu

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)
986 Downloads (Pure)


A fifth order X-band waveguide bandpass filter, based on spherical resonators, has been designed, and fabricated by 3-D printing. In comparison with rectangular waveguide, spherical resonators have a higher unloaded quality factor, but at the same time suffer from closer higher order modes. In this letter, a special topology has been proposed to relieve the impact of the first three higher order modes in the resonator and ultimately to achieve a good out-of-band rejection. Stereolithography based 3-D printing is used to build the filter structure from polymer and a 25 microns thick copper layer is deposited to the filter. The measurement result of the filter has an excellent agreement with the simulations. The filter is also considerably lighter than a similar metal filter.
Original languageEnglish
Article number7115191
Pages (from-to)442-444
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number7
Early online date1 Jun 2015
Publication statusPublished - 2 Jul 2015

Bibliographical note

This paper won the 2017 Tatsuo Itoh Prize of the IEEE Microwave Theory and Techniques Society. This award recognizes the most significant contribution by a published paper in the IEEE Microwave and Wireless Components Letters Journal


  • 3-D printing
  • Filter
  • spherical resonators
  • stereolithography
  • waveguide

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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