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

Guoxiang Shu, Junzhe Deng, Lulu Xie, Guo Liu, Liang Zhang, Jianxun Wang, Zhengfang Qiao, Wenlong He

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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.

Original languageEnglish
Pages (from-to)292-301
Number of pages10
JournalIEEE Transactions on Terahertz Science & Technology
Volume10
Issue number3
Early online date10 Feb 2020
DOIs
Publication statusPublished - 31 May 2020

Keywords

  • high frequency system
  • interaction instability
  • terahertz wave amplification
  • sheet beam travelling wave tubes

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