Development of a 140-GHz folded-waveguide traveling-wave tube in a relatively larger circular electron beam tunnel

Zhanliang Wang, Qing Zhou, Huarong Gong, Junpeng Liao, Yanyu Wei, Zhaoyun Duan, Hongwei Liu and Yubin Gong

Journal of Electromagnetic Waves and Applications, 2017, vol. 31, issue 17, 1914-1923

Abstract: A 140-GHz folded-waveguide traveling wave tube (FWG-TWT) with a relatively larger circular electron beam tunnel was designed and developed. Using simulation software, the high frequency characteristics, the transfer characteristics, and the beam-wave interaction of the TWT were studied in detail. The simulation predicted up to 98 W output power and about 43 dB gain of FWG-TWT at the center frequency. The input and output couplers compatible with the FWG-SWS and the periodic permanent magnet focusing structure were designed. The FWG-TWT thus designed was fabricated and tested. The experimental result shows the output power exceeding 1.6 W and the gain exceeding 25 dB at 140 GHz when the input power is 5 mW. The reasons for the departure of the experimental from the simulated results have been explained.

Date: 2017
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DOI: 10.1080/09205071.2017.1341346

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