中国物理B ›› 2002, Vol. 11 ›› Issue (3): 277-281.doi: 10.1088/1009-1963/11/3/315

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Dielectric effect on the rf characteristics of a helical groove travelling wave tube

魏彦玉1, 王文祥1, 孙嘉鸿1, 刘盛纲1, Baofu Jia2, Gun-Sik Park3   

  1. (1)National Key Laboratory of High Power Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China; (2)National Key Laboratory of High Power Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China; Vacuum Electrophysical National Laboratory, Department of Physics, Seoul National University, Korea; (3)Vacuum Electrophysical National Laboratory, Department of Physics, Seoul National University, Korea
  • 收稿日期:2001-02-14 修回日期:2001-11-02 出版日期:2002-03-13 发布日期:2005-06-13
  • 基金资助:
    Project supported by the Fund of the Institute of Electronics Science of the Ministry of Electron Industry (Grant No DJ3.1.1.2).

Dielectric effect on the rf characteristics of a helical groove travelling wave tube

Wei Yan-Yu (魏彦玉)a, Wang Wen-Xiang (王文祥)a, Sun Jia-Hong (孙嘉鸿)a, Liu Sheng-Gang (刘盛纲)a, Baofu Jiaab, Gun-Sik Parkb   

  1. a National Key Laboratory of High Power Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China; b Vacuum Electrophysical National Laboratory, Department of Physics, Seoul National University, Korea
  • Received:2001-02-14 Revised:2001-11-02 Online:2002-03-13 Published:2005-06-13
  • Supported by:
    Project supported by the Fund of the Institute of Electronics Science of the Ministry of Electron Industry (Grant No DJ3.1.1.2).

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摘要： A new type of partial-dielectric-loaded helical groove slow-wave structure (SWS) for millimetre wave travelling wave tube (TWT) is presented in this paper. The radio-frequency characteristics including the dispersion properties, the longitudinal electric field distribution and the beam-wave coupling impedance of this structure are analysed. The results show that the dispersion of the helical groove circuit is weakened, the phase velocity is reduced and the position of the maximum Ez is moved from the mouth to the inside of the groove after partially filling the dielectric materials in the helical groove SWS. Therefore, the dielectric-loaded helical groove SWS is suitable for a multi-beam TWT with broad band and high gain.

Abstract: A new type of partial-dielectric-loaded helical groove slow-wave structure (SWS) for millimetre wave travelling wave tube (TWT) is presented in this paper. The radio-frequency characteristics including the dispersion properties, the longitudinal electric field distribution and the beam-wave coupling impedance of this structure are analysed. The results show that the dispersion of the helical groove circuit is weakened, the phase velocity is reduced and the position of the maximum Ez is moved from the mouth to the inside of the groove after partially filling the dielectric materials in the helical groove SWS. Therefore, the dielectric-loaded helical groove SWS is suitable for a multi-beam TWT with broad band and high gain.

Key words: dielectric-loading, helical groove waveguide, slow wave structure, travelling wave tube

中图分类号:  (Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)

  • 77.84.-s
84.40.Az (Waveguides, transmission lines, striplines) 84.40.Fe (Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.))