Design, fabrication, and cold test of a high frequency system for an H-band sheet beam travelling wave tube

Shu, Guoxiang and Deng, Junzhe and Xie, Lulu and Liu, Guo and Zhang, Liang and Wang, Jianxun and Qiao, Zhengfang and He, Wenlong (2020) Design, fabrication, and cold test of a high frequency system for an H-band sheet beam travelling wave tube. IEEE Transactions on Terahertz Science & Technology, 10 (3). pp. 292-301. ISSN 2156-3446 (https://doi.org/10.1109/TTHZ.2020.2972531)

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Abstract

The design, fabrication and cold test of a high frequency system (HFS) for an H-band (220-325GHz) sheet beam travelling wave tube is presented in this article. The HFS was composed of a 90-period double-staggered grating waveguide and a pair of identical L-shaped couplers with Bragg reflectors and matching steps. The HFS was manufactured by nano-computer numerical control machining and its electromagnetic properties were measured by using a vector network analyzer. The measured S-parameters were in good agreement with the simulated ones, which predicted a 3 dB bandwidth of ∼47.0 GHz. The maximum value of the measured transmission coefficient S 21 was -4.9 dB and the in-band port reflection S 11 was around -15.0 dB. Based on the cold testing-based HFS, simulations of the beam wave interaction predicted a stable output power of over 55.1 W in the frequency range of 230-280 GHz. In addition, the instabilities of the beam wave interaction were investigated in the simulation.

  • Item type:Article
    ID code:71490
    Dates:
    Date
    Event
    31 May 2020
    Published
    10 February 2020
    Published Online
    3 February 2020
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:14 Feb 2020 16:22
    Last modified:11 Apr 2024 01:52
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/71490
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