中国物理B ›› 2006, Vol. 15 ›› Issue (9): 2114-2119.doi: 10.1088/1009-1963/15/9/035

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Accurate analysis of arbitrarily-shaped helical groove waveguide

刘洪涛, 魏彦玉, 宫玉彬, 岳玲娜, 王文祥   

  1. National Key Laboratory of High Power Vacuum Electronics, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054
  • 收稿日期:2005-11-23 修回日期:2006-04-22 出版日期:2006-09-20 发布日期:2006-09-20
  • 基金资助:
    Project supported in part by the National Natural Science Foundation of China (Grant Nos 60401005 and 60532010) and the Fok Ying Tung Education Foundation(Grant No 91063).

Accurate analysis of arbitrarily-shaped helical groove waveguide

Liu Hong-Tao(刘洪涛)†, Wei Yan-Yu(魏彦玉)‡, Gong Yu-Bin(宫玉彬), Yue Ling-Na(岳玲娜), and Wang Wen-Xiang(王文祥)   

  1. National Key Laboratory of High Power Vacuum Electronics, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054
  • Received:2005-11-23 Revised:2006-04-22 Online:2006-09-20 Published:2006-09-20
  • Supported by:
    Project supported in part by the National Natural Science Foundation of China (Grant Nos 60401005 and 60532010) and the Fok Ying Tung Education Foundation(Grant No 91063).

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摘要： This paper presents a theory on accurately analysing the dispersion relation and the interaction impedance of electromagnetic waves propagating through a helical groove waveguide with arbitrary groove shape, in which the complex groove profile is synthesized by a series of rectangular steps. By introducing the influence of high-order evanescent modes on the connection of any two neighbouring steps by an equivalent susceptance under a modified admittance matching condition, the assumption of the neglecting discontinuity capacitance in previously published analysis is avoided, and the accurate dispersion equation is obtained by means of a combination of field-matching method and admittance-matching technique. The validity of this theory is proved by comparison between the measurements and the numerical calculations for two kinds of helical groove waveguides with different groove shapes.

Abstract: This paper presents a theory on accurately analysing the dispersion relation and the interaction impedance of electromagnetic waves propagating through a helical groove waveguide with arbitrary groove shape, in which the complex groove profile is synthesized by a series of rectangular steps. By introducing the influence of high-order evanescent modes on the connection of any two neighbouring steps by an equivalent susceptance under a modified admittance matching condition, the assumption of the neglecting discontinuity capacitance in previously published analysis is avoided, and the accurate dispersion equation is obtained by means of a combination of field-matching method and admittance-matching technique. The validity of this theory is proved by comparison between the measurements and the numerical calculations for two kinds of helical groove waveguides with different groove shapes.

Key words: helical groove waveguide, dispersion characteristic, interaction impedance, travelling wave tube

中图分类号:  (Persistent currents)

  • 73.23.Ra