Design, simulation, and cold test of a W-band double nonparallel staggered grating backward wave oscillator

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Zhang, Jin and Alfadhl, Yasir and Chen, Xiaodong and Zhang, Liang and Cross, Adrian W. (2022) Design, simulation, and cold test of a W-band double nonparallel staggered grating backward wave oscillator. IEEE Transactions on Electron Devices, 69 (10). pp. 5814-5818. ISSN 0018-9383 (https://doi.org/10.1109/TED.2022.3195484)

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Abstract

A novel double nonparallel staggered grating (DNPSG) slow wave structure (SWS) is proposed to enhance the coupling impedance in a W-band backward wave oscillator (BWO) driven by a pseudosparksourced sheet electron beam. The DNPSG SWS has been shown a broadband of 72–125 GHz and a higher coupling impedance compared with the traditional double staggered grating (DSG) SWS in simulation. The DNPSG BWO structure consisting of ten SWS units and a broadband output structure is designed and fabricated. In the cold test of the DNPSG BWO, the measured S11 (double of the losses in the DNPSG BWO) is above −10 dB in most of the band, which is satisfactory in the pseudospark-driven high-power device. The hot-test performance of the DNPSG BWO is analyzed by particle-in-cell (PIC) simulation in a beam voltage range of 14–90 kV and a current density range of 1.5–5 × 107 A/m2, obtaining a high output power (max. 190 kW) over an ultrawide tuning band of 38 GHz (75–113 GHz) due to enhanced coupling impedance.

ORCID iDs

Zhang, Jin, Alfadhl, Yasir, Chen, Xiaodong, Zhang, Liang ORCID logoORCID: https://orcid.org/0000-0002-6317-0395 and Cross, Adrian W. ORCID logoORCID: https://orcid.org/0000-0001-7672-1283;
  • Item type:Article
    ID code:81797
    Dates:
    Date
    Event
    1 October 2022
    Published
    5 August 2022
    Published Online
    28 July 2022
    Accepted
    Notes:© 2022 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:10 Aug 2022 13:22
    Last modified:21 Dec 2024 01:25
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/81797
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