Accurate analysis of arbitrarily-shaped helical groove waveguide |
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Authors: | Liu Hong-Tao Wei Yan-Yu Gong Yu-Bin Yue Ling-Na and Wang Wen-Xiang |
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Institution: | National Key Laboratory of High Power Vacuum Electronics, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054 |
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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. |
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Keywords: | helical groove waveguide dispersion characteristic interaction impedance travelling wave tube |
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