Development of a 140-GHz folded-waveguide traveling-wave tube in a relatively larger circular electron beam tunnel. Issue 17 (22nd November 2017)

• Record Type: Journal Article
• Authors: Wang, Zhanliang; Zhou, Qing; Gong, Huarong; Liao, Junpeng; Wei, Yanyu; Duan, Zhaoyun; Liu, Hongwei; Gong, Yubin
• Is Part Of: Journal of electromagnetic waves and applications. Volume 31:Issue 17(2017)
• Page Start: 1914
• Page End: 1923
• Publication Date: 2017-11-22
• Subjects: TWT -- THz TWT -- folded-waveguide (FWG) TWT -- FWG slow-wave structure; Electromagnetic waves -- Periodicals; Electromagnetic devices -- Periodicals; 621.3
• DOI: 10.1080/09205071.2017.1341346
• Languages: English
• ISSNs: 0920-5071

Abstract

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.