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

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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.

ORCID iDs

Shu, Guoxiang, Deng, Junzhe, Xie, Lulu, Liu, Guo, Zhang, Liang ORCID logoORCID: https://orcid.org/0000-0002-6317-0395, Wang, Jianxun, Qiao, Zhengfang and He, Wenlong;
  • 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:04 Dec 2024 08:36
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/71490
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