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

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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;