A W-band low-loss dual-polarization quasi-TEM waveguide

Hao Xin, Te Chuan Chen, Hooman Kazemi

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


As an enabling feed/interconnect element for various millimeter wave components, dual polarization quasi-transverse electromagnetic (TEM) waveguides at W-band (75-110 GHz) are investigated with two-dimensional electromagnetic crystal (EMXT) surfaces as the four boundary walls instead of the regular metallic walls. A 2.54 mm x 2.54 mm quasi-TEM square waveguide prototype with a length of 2 mm is fabricated and demonstrated. Both eigenmode and full-wave EM simulations of the prototype verify the quasi-TEM propagation at the designed frequency of 95 GHz with a bandwidth of more than 10% and the low insertion loss for the entire W-band. The prototype waveguide is measured in a WR-10 fixture and the results agree with simulations well. To better understand the loss mechanisms, various design and packaging parameters are studied. Undesirable resonant surface modes have been identified as a critical cause of loss at specific frequencies. This type of waveguides may also be useful for spatial power combining, low loss interconnects, and packaging for millimeter wave systems.

Original languageEnglish (US)
Pages (from-to)1661-1668
Number of pages8
JournalIEEE Transactions on Antennas and Propagation
Issue number6
StatePublished - Jun 2008


  • Electromagnetic crystal
  • Millimeter wave (mmW)
  • Quasi-transverse electromagnetic (TEM) waveguide
  • Surface mode

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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