Design, Fabrication, and Cold Test of a High Frequency System for an H-Band Sheet Beam Travelling Wave Tube

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...

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Veröffentlicht in:IEEE transactions on terahertz science and technology 2020-05, Vol.10 (3), p.292-301
Hauptverfasser: Shu, Guoxiang, Deng, Junzhe, Xie, Lulu, Liu, Guo, Zhang, Liang, Wang, Jianxun, Qian, Zhengfang, He, Wenlong
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Sprache:eng
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Zusammenfassung: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.
ISSN:2156-342X
2156-3446
DOI:10.1109/TTHZ.2020.2972531