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Investigation of a wideband folded double-ridged waveguide slow-wave system |
| He Jun(何俊), Wei Yan-Yu(魏彦玉)†, Gong Yu-Bin(宫玉彬), and Wang Wen-Xiang(王文祥) |
| Vacuum Electronics National Laboratory, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China |
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Abstract The folded double-ridged waveguide structure is presented and its properties used for wide-band traveling-wave tube are investigated. Expressions of dispersion characteristics, normalized phase velocity and interaction impedance of this structure are derived and numerically calculated. The calculated results using our theory agree well with those obtained by using the 3D electromagnetic simulation software HFSS. Influences of the ridge-loaded area and broad-wall dimensions on the high frequency characteristics of the novel slow-wave structure are discussed. It is shown that the folded double-ridged waveguide structure has a much wider relative passband than the folded waveguide slow-wave structure and a relative passband of 67% could be obtained, indicating that this structure can operate in broad-band frequency ranges of beam–wave interaction. The small signal gain property is investigated for ensuring the improvement of bandwidth. Meanwhile, with comparable dispersion characteristics, the transverse section dimension of this novel structure is much smaller than that of conventional one, which indicates an available way to reduce the weight of traveling-wave tube.
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Received: 13 August 2010
Revised: 24 December 2010
Accepted manuscript online:
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PACS:
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41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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41.60.Cr
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(Free-electron lasers)
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| Fund: Project supported in part by the National Natural Science Foundation of China (Grant No. 60971038) and in part by the Fundamental Research Funds for Central Universities, China (Grant No. ZYGX2009Z003). |
Cite this article:
He Jun(何俊), Wei Yan-Yu(魏彦玉), Gong Yu-Bin(宫玉彬), and Wang Wen-Xiang(王文祥) Investigation of a wideband folded double-ridged waveguide slow-wave system 2011 Chin. Phys. B 20 054102
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