Design study of a 372 GHz higher order mode input coupler

Garner, Jason R. and Zhang, Liang and Donaldson, Craig R. and Cross, Adrian W. and He, Wenlong (2016) Design study of a 372 GHz higher order mode input coupler. IEEE Transactions on Electron Devices, 63 (8). pp. 3284-3290. ISSN 0018-9383

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    Abstract

    The design of a higher order mode  (HOM) input coupler for a low-THz gyrotron travelling wave amplifier (gyro-TWA) is presented. A two-branch waveguide coupler based on the even distribution of incident power is designed to couple the rectangular TE10 mode to the circular TE61 mode. The optimised tapered waveguide input coupler achieved an operating frequency range of 359 – 385 GHz, equating to a bandwidth of 7%. A prototype waveguide coupler scaled to W-band (75GHz to 110GHz) was manufactured. Vector Network Analyser (VNA) measured return loss of the HOM coupler is shown to be < 10dB at 90 – 96 GHz. A transmission and phase measurement is presented to analyse TE61 mode conversion in the coupler.

    Author(s):Garner, Jason R. ORCID logoORCID: https://orcid.org/0000-0002-9985-0739, Zhang, Liang ORCID logoORCID: https://orcid.org/0000-0002-6317-0395, Donaldson, Craig R. ORCID logoORCID: https://orcid.org/0000-0001-6627-2461, Cross, Adrian W. ORCID logoORCID: https://orcid.org/0000-0001-7672-1283 and He, Wenlong ORCID logoORCID: https://orcid.org/0000-0001-7018-0527
    Item type:Article
    ID code:56705
    Notes:(c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, 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 components of this work in other works.
    Keywords:Gyro-TWA, mode coupling, waveguide coupler, THz input coupler, Electrical engineering. Electronics Nuclear engineering, Electrical and Electronic Engineering
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:21 Jun 2016 12:05
    Last modified:22 Jan 2020 03:06
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/56705
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