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Study on Ka-band sheet-beam, three-slot-staggered-ladder coupled-cavity traveling-wave tube in a small tunable periodic cusped magnet

Author

Listed:
  • Hongwei Liu
  • Zhanliang Wang
  • Yubin Gong
  • Yanyu Wei
  • Zhaoyun Duan
  • Huarong Gong
  • Jinjun Feng

Abstract

A Ka-band sheet electron beam (SEB) traveling-wave tube (TWT) based on three-slot staggered-ladder (TSTL) coupled-cavity slow-wave structure (CC-SWS) is proposed. The high-frequency characteristics of TSTL SWS were analyzed in detail. A well-matched input/output coupling system that solves the problem of energy coupling between the SWS and the external circuit was designed. A new method of loading the distributed attenuator for TSTL SWS was investigated for suppressing backward wave oscillation effectively. In addition, a SEB gun which can produce the SEB conveniently was optimized. A small tunable periodic cusped magnet (STPCM) system was designed to focus the low voltage, high-current SEB, which decreases the whole dimension of the TWT sufficiently. Moreover, the special STPCM system is predicted to exhibit 100% beam transmission efficiency. Finally, the beam-wave interaction was studied. The results obtained by CST simulation show that the SEB TWT can produce output power over 5 kW within the bandwidth ranging from 31.5 to 35.5 GHz, and the maximum output power is 10.15 kW at 33 GHz, corresponding electron efficiency of 10.36%. The fabrication of the device is under way.

Suggested Citation

  • Hongwei Liu & Zhanliang Wang & Yubin Gong & Yanyu Wei & Zhaoyun Duan & Huarong Gong & Jinjun Feng, 2017. "Study on Ka-band sheet-beam, three-slot-staggered-ladder coupled-cavity traveling-wave tube in a small tunable periodic cusped magnet," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 31(17), pages 1924-1937, November.
    • Handle: RePEc:taf:tewaxx:v:31:y:2017:i:17:p:1924-1937
    DOI: 10.1080/09205071.2017.1341855
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