Electromagnetic crystal (EMXT) waveguide band-stop filter

Hao Xin, Aiden Higgins, Jonathan Hacker, Moonil Kim, Mark Rosker

Research output: Contribution to journalLetterpeer-review

8 Scopus citations


An electromagnetic crystal (EMXT) with a bandgap around 35 GHz is used as the top and/or bottom walls of a rectangular waveguide. Because of its bandgap, such an EMXT waveguide is a very effective band-stop filter with the rejection band centered at 35 GHz. More than 70 dB of isolation for the rejection band and less than 2 dB of insertion loss for the pass band are measured. Finite element simulation of the EMXT band-stop filter agrees very well with measurements. Using tunable EMXT walls, a band-stop filter with adjustable center frequency and bandwidth can also be realized.

Original languageEnglish (US)
Pages (from-to)108-110
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number3
StatePublished - Mar 2003


  • Band-stop filter
  • Electromagnetic band gap
  • Electromagnetic crystal
  • Waveguides

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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