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)
National Key Laboratory of High Power Vacuum Electronics, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054
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.
Received: 23 November 2005
Revised: 22 April 2006
Accepted manuscript online:
PACS:
73.23.Ra
(Persistent currents)
Fund: 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).
Cite this article:
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) Accurate analysis of arbitrarily-shaped helical groove waveguide 2006 Chinese Physics 15 2114
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