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

Paoloni, Claudio and Mineo, Mauro and Yin, Huabi and Zhang, Liang and He, Wenlong and Robertson, Craig W. and Ronald, Kevin and Phelps, Alan D.R. and Cross, Adrian W. (2016) Microwave coupler for W-band micro re-entrant square cavities. IET Microwaves, Antennas & Propagation, 10 (7). pp. 764-769. ISSN 1751-8725

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    Abstract

    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.