Fivefold helically corrugated waveguide for high-power w-band gyro-devices and pulse compression

Donaldson, Craig R. and Zhang, Liang and Hiscock, Peter and Harris, Michael and Beardsley, Matthew J. and Huggard, Peter G. and Whyte, Colin G. and Cross, Adrian W. and He, Wenlong (2021) Fivefold helically corrugated waveguide for high-power w-band gyro-devices and pulse compression. IEEE Transactions on Electron Devices. pp. 1-6. ISSN 0018-9383 (https://doi.org/10.1109/TED.2021.3130846)

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Abstract

The design, simulation, manufacture and measurement of a W-band five-fold (5F) helically corrugated waveguide (HCW) is reported. The 5F HCW is based on the coupling of the traveling TE31 and near cut-off TE22 modes to create an operating eigenwave. The fabricated test structure has circular waveguide ports and features elliptical polariser sections and broadband TE11 to TE31 mode converters on either side of the 5F HCW. The optimised mode converter design, based on a four-fold (4F) HCW, has a predicted power conversion efficiency greater than 90% from 89 to 102.5 GHz, and 96% peak efficiency at 94 GHz. The optimization of the 5F HCW geometry produced an eigenwave suitable for gyro-devices, but the optimization could equally well have been directed to applications such as pulse compression and microwave undulators. Analysis of simulated electric field profiles showed that the propagating power in the 5F HCW was increased by a factor of 6 over that in the 3F HCW at equivalent peak electric field strength. This is due to the larger diameter of the waveguide. Test structures were manufactured through a combination of precision machining of a sacrificial mandrel, copper growth by electroforming followed by removal of the aluminium mandrel by chemically etching. Measurements of the 5F HCW structure’s dispersion showed excellent agreement with the prediction over the design range of 90 to 98 GHz.

  • Item type:Article
    ID code:78997
    Dates:
    Date
    Event
    7 December 2021
    Published
    7 December 2021
    Published Online
    23 November 2021
    Accepted
    Notes:© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:20 Dec 2021 14:21
    Last modified:09 Apr 2024 02:53
    URI:https://strathprints.strath.ac.uk/id/eprint/78997
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