An open-styled dielectric-lined azimuthally periodic circular waveguide for a millimeter wave traveling-wave tube

doi:10.1088/1674-1056/21/4/048403

Abstract An open-styled dielectric-lined azimuthally periodic circular waveguide (ODLAP-CW) for a millimeter-wave traveling-wave tube (TWT) is proposed, which is a modified form of a dielectric-lined azimuthally periodic circular waveguide (DLAP-CW). The slow-wave characteristics of the open-styled DLAP-CW are studied by using the spatial harmonics method, which includes normalized phase velocity and interaction impedance. The complicated dispersion equations are numerically solved with MATLAB and the results are in good agreement with the simulation results obtained from HFSS. The influence of structural parameters on the RF properties is investigated based on our theory. The numerical results show that the optimal thickness of the metal rod can increase the interaction impedance, with the dielectric constant held fixed. Finally, the slow-wave characteristics and transmission properties of an open-styled structure are compared with those of the DLAP-CW. The results validate that the mode competition is eliminated in the improved structure with only a slight influence on the dispersion characteristics, which may significantly improve the stability of an open-styled DLAP-CW-based TWT, and the interaction efficiency is also improved.

Keywords: dispersion characteristics slow-wave structure millimeter wave traveling-wave tube spatial harmonics method

Received: 02 August 2011
Revised: 19 September 2011
Accepted manuscript online:

PACS:	84.47.+w	(Vacuum tubes)
	41.20.Jb	(Electromagnetic wave propagation; radiowave propagation)
	84.40.Fe	(Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.))

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60971038) and the Fundamental Research Funds for the Central Universities, China (Grant Nos. ZYGX2009Z003 and ZYGX2010J054).

Corresponding Authors: Wei Yan-Yu,yywei@uestc.edu.cn
E-mail: yywei@uestc.edu.cn

Cite this article:

Liu Yang(刘漾), Wei Yan-Yu(魏彦玉), Xu Jin(徐进), Yin Hai-Rong(殷海荣), Yue Ling-Na(岳玲娜), Gong Yu-Bin(宫玉彬), and Wang Wen-Xiang(王文祥) An open-styled dielectric-lined azimuthally periodic circular waveguide for a millimeter wave traveling-wave tube 2012 Chin. Phys. B 21 048403

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An open-styled dielectric-lined azimuthally periodic circular waveguide for a millimeter wave traveling-wave tube

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