中国物理B ›› 2012, Vol. 21 ›› Issue (5): 58401-058401.doi: 10.1088/1674-1056/21/5/058401

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Analysis and design of the taper in metal-grating periodic slow-wave structures for rectangular Cerenkov masers

陈晔1 2,赵鼎1,王勇1,舒雯1 2   

  1. 1. Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2011-09-27 修回日期:2012-04-27 出版日期:2012-04-01 发布日期:2012-04-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 60801031).

Analysis and design of the taper in metal-grating periodic slow-wave structures for rectangular Cerenkov masers

Chen Ye(陈晔)a)b)†, Zhao Ding(赵鼎)a), Wang Yong(王勇)a), and Shu Wen(舒雯)a)b)   

  1. a. Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;
    b. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2011-09-27 Revised:2012-04-27 Online:2012-04-01 Published:2012-04-01
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 60801031).

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摘要： The hybrid-mode dispersion equation of the metal-grating periodic slow-wave structure for a rectangular Cerenkov maser is derived by using the Borgnis function and field-matching methods. An equivalent-circuit model for the taper of the groove depth that matches the smooth waveguide to the metal-grating structure is proposed. By using the equivalent-circuit method, as well as the Ansoft high frequency structure simulator (HFSS) code, an appropriate electromagnetic mode for beam-wave interaction is selected and the equivalent-circuit analysis on the taper is given. The calculated results show that a cumulative reflection coefficient of 0.025 for the beam-wave interaction structure at a working frequency of 78.1 GHz can be reached by designing the exponential taper with a TEz10 rectangular waveguide mode as the input and the desired TEx10 mode as the output. It is worth pointing out that by using the equivalent-circuit method, the complex field-matching problems from the traditional field-theory method for taper design can be avoided, so the taper analysis process is markedly simplified.

关键词: rectangular Cerenkov maser, Borgnis function method, equivalent-circuit method, HFSS, taper

Abstract: The hybrid-mode dispersion equation of the metal-grating periodic slow-wave structure for a rectangular Cerenkov maser is derived by using the Borgnis function and field-matching methods. An equivalent-circuit model for the taper of the groove depth that matches the smooth waveguide to the metal-grating structure is proposed. By using the equivalent-circuit method, as well as the Ansoft high frequency structure simulator (HFSS) code, an appropriate electromagnetic mode for beam-wave interaction is selected and the equivalent-circuit analysis on the taper is given. The calculated results show that a cumulative reflection coefficient of 0.025 for the beam-wave interaction structure at a working frequency of 78.1 GHz can be reached by designing the exponential taper with a TEz10 rectangular waveguide mode as the input and the desired TEx10 mode as the output. It is worth pointing out that by using the equivalent-circuit method, the complex field-matching problems from the traditional field-theory method for taper design can be avoided, so the taper analysis process is markedly simplified.

Key words: rectangular Cerenkov maser, Borgnis function method, equivalent-circuit method, HFSS, taper

中图分类号:  (Masers; gyrotrons (cyclotron-resonance masers))

  • 84.40.Ik
94.05.Pt (Wave/wave, wave/particle interactions) 41.60.Bq (Cherenkov radiation)