Tunable millimeter wave band-pass filter using electromagnetic crystal sidewalls

J. A. Higgins, Hao Xin, A. Sailer

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations


Electromagnetic crystal (EMXT) structures are used as the waveguide sidewalls of a Ka-Band waveguide cavity. With InP hetereobarrier varactors (HBV) embedded, the EMXT structure acts as an electronically tunable surface impedance in place of the normal conducting metal sidewalls. By controlling and varying the sidewall impedance with a dc voltage, the EMXT waveguide propagation constant is varied and the effective electrical length of the cavity changed. The center of the pass band was tuned from 31.6 GHz to 33.2 GHz by varying the varactor bias from 0 to 10V. It is demonstrated that the guide width can play a significant role in controlling tuning range. Good agreement between measured and simulated band-pass response was obtained.

Original languageEnglish (US)
Pages (from-to)1295-1298
Number of pages4
JournalIEEE MTT-S International Microwave Symposium Digest
StatePublished - 2004
Event2004 IEEE MITT-S International Microwave Symposium Digest - Fort Worth, TX, United States
Duration: Jun 6 2004Jun 11 2004


  • Electromagnetic Crystals
  • Millimeter waves
  • Resonators
  • Tunable Filters
  • Waveguides

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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