Microwave coupler for W-band micro re-entrant square cavities

Claudio Paoloni, Mauro Mineo, Huabi Yin, Liang Zhang, Wenlong He, Craig W. Robertson, Kevin Ronald, Alan D.R. Phelps, Adrian W. Cross

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)
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Klystrons are vacuum electronic devices widely used for microwave amplification up to the millimetre-wave region. The opportunity to push the operating frequency of conventional klystrons above 30–40 GHz is limited by the fabrication difficulties of the cavities that have very small dimensions. A high order mode micro re-entrant square cavity was purposely devised to be compatible with the available micro fabrication processes and represents a viable solution for the design of millimetre-wave klystrons. In this study, a coupler to correctly excite the higher order mode of the square re-entrant cavities for W-band operation is proposed. The design of the proposed novel coupler structure has been validated by realisation and measurement of a scaled X-band prototype. The post-realisation tuning methods adopted to improve the matching of the high order mode are also presented.
Original languageEnglish
Pages (from-to)764-769
Number of pages6
JournalIET Microwaves, Antennas & Propagation
Issue number7
Publication statusPublished - 15 May 2016


  • klystrons
  • microwave devices
  • vacuum electronic device
  • W-band micro re-entrant square cavity
  • millimetre-wave klystron


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