Design and measurement of a broadband sidewall coupler for a W-band gyro-TWA

Liang Zhang, Wenlong He, Craig R. Donaldson, Jason R. Garner, Paul McElhinney, Adrian W. Cross

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)
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The input coupler is an important component for a microwave amplifier. In this paper, a sidewall single-hole input coupler for a W-band gyrotron traveling-wave amplifier that operates at the frequency range of 90–100 GHz was designed and measured. Instead of using a cutoff waveguide, a broadband Braggtype reflector with a small spread in phase was optimized for use as part of the input coupler. The minimum radius of the reflector was two times the size of a cutoff waveguide, which reduced the possibility for some of the beam electrons being collected in this section and lost to the amplifier interaction region.
Original languageEnglish
Pages (from-to)3183-3190
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number10
Early online date14 Aug 2015
Publication statusPublished - 31 Oct 2015


  • Bragg reflector
  • gyrotron traveling-wave amplifier (gyro-TWA)
  • input coupler


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