DocumentCode :
1755398
Title :
A Study of the Effects of Helix Misalignment on the Cold Parameters of a Sheath Helix Slow-Wave Structure
Author :
Wanghe Wei ; Yanyu Wei ; Yuanyuan Wang ; Wenxiang Wang ; Yubin Gong
Author_Institution :
Sch. of Phys. Electron., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Volume :
62
Issue :
4
fYear :
2015
fDate :
42095
Firstpage :
1334
Lastpage :
1341
Abstract :
The cold parameters including the dispersion properties and the average interaction impedance of a sheath eccentric helix slow-wave structure in a circular waveguide are investigated. With the applications of orthogonal properties of the helix modes and Graf´s addition theorem for modified Bessel functions, the closed-form characteristic equations concerning the helix modes are derived rigorously. The obtained characteristic equations show that the misaligned structure admits only the field solutions existing in the form of the superposition of hybrid modes. Numerical calculations show that the normalized phase velocity and the average interaction impedance of the helix dominant mode decrease as the misalignment of the inner helix increases and that more hybrid modes must be considered for satisfactory convergence with the increase in the misalignment. The effects of different misalignments on the cold parameters of the eccentric structure are investigated and the results are discussed.
Keywords :
Bessel functions; circular waveguides; slow wave structures; average interaction impedance; circular waveguide; cold parameters; dispersion properties; helix misalignment; modified Bessel functions; sheath eccentric helix slow-wave structure; Boundary conditions; Dielectrics; Dispersion; Equations; Impedance; Mathematical model; Metals; Characteristic equations; Graf´s addition theorem; Graf???s addition theorem; circular waveguide with eccentric sheath helix; cylindrical harmonic expansion; orthogonal properties of the modes; orthogonal properties of the modes.;
fLanguage :
English
Journal_Title :
Electron Devices, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9383
Type :
jour
DOI :
10.1109/TED.2015.2404824
Filename :
7055303
Link To Document :
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