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H - and E -Plane Loaded Slow Wave Structure for W -Band TWT

Research output: Contribution to journalJournal article

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<mark>Journal publication date</mark>31/01/2020
<mark>Journal</mark>IEEE Transactions on Electron Devices
Issue number1
Volume67
Number of pages5
Pages (from-to)309-313
Publication StatusPublished
Early online date19/12/19
<mark>Original language</mark>English

Abstract

Sheet beam vacuum electron tubes are an attractive solution for high-power sources or amplifiers at millimeter-waves. In this article, a novel W -band slow wave structure (SWS) for traveling wave tube (TWT) amplifiers supporting a sheet beam is proposed. The SWS is based on a rectangular waveguide with H - and E -plane loaded (HEL) metal corrugations. A test structure of the proposed HEL SWS with purposely designed input and output couplers was built in the frequency range of 91–98 GHz ( W -band). The measured scattering-parameters agree well with the simulations showing S11<−15 dB over 10-GHz bandwidth. A TWT was designed and simulated with the HEL SWS. It shows very good gain-bandwidth performance. The SWS is easy to manufacture by low-cost computer numerical controlled (CNC)-milling. The results demonstrated that the HEL SWS is a very good solution to build high-power, wideband millimeter-wave TWTs for a wide range of applications that need high power in a broad frequency range.

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©2020 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.