Numerical and experimental validation of the passive performance of a co-harmonic gyro-multiplier interaction region

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Constable, David A. and Phelps, Alan D. R. and Whyte, Colin G. and He, Wenlong and Cross, Adrian W. and Ronald, Kevin (2021) Numerical and experimental validation of the passive performance of a co-harmonic gyro-multiplier interaction region. IEEE Transactions on Microwave Theory and Techniques, 69 (10). pp. 4377-4384. ISSN 0018-9480 (https://doi.org/10.1109/TMTT.2021.3094219)

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Abstract

The azimuthally rippled cavity for a large-orbit, coharmonic gyro-multiplier, designed to operate at the second and fourth harmonics, at frequencies of 37.5 and 75 GHz, respectively, has been numerically and experimentally confirmed to be insensitive to the polarization of quadrupole, {\text{TE}}_{2,n} -like modes, including the second-harmonic operating mode of the multiplier, a cylindrical TE2,2-like waveguide mode. To test the cavity with this mode required the design, construction, and measurement of ripple wall mode converters, converting the cylindrical TE2,1 mode into the TE2,2 mode. These were designed to operate at a central frequency of 37.9 GHz, with predicted mode purity of better than 85%, and 3-dB bandwidth of 161 MHz. The constructed converter had a central operating frequency of 37.7 GHz, with S -parameter measurements used to infer suitable mode purity and an operational 3-dB bandwidth of 50 MHz. This has allowed far-field phase measurements of the corrugated cavity to be conducted, where the orientation of the geometry to the polarization of both the TE2,1 and TE2,2 modes was shown to have no effect on the dispersion.

ORCID iDs

Constable, David A., Phelps, Alan D. R. ORCID logoORCID: https://orcid.org/0000-0002-1100-1012, Whyte, Colin G. ORCID logoORCID: https://orcid.org/0000-0002-5431-2443, He, Wenlong ORCID logoORCID: https://orcid.org/0000-0001-7018-0527, Cross, Adrian W. ORCID logoORCID: https://orcid.org/0000-0001-7672-1283 and Ronald, Kevin ORCID logoORCID: https://orcid.org/0000-0002-8585-0746;
  • Item type:Article
    ID code:76938
    Dates:
    Date
    Event
    1 October 2021
    Published
    12 June 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:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:01 Jul 2021 10:26
    Last modified:18 Dec 2024 01:29
    URI:https://strathprints.strath.ac.uk/id/eprint/76938
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