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
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.