Design and development of high linearity millimeter wave traveling-wave tube for satellite communications

doi:10.1088/1674-1056/24/10/104102

Abstract The linearity of the traveling-wave tube is a very important characteristic for a modern communication system. To improve the linearity of the traveling-wave tube at no expense of the saturated output power and overall efficiency, a modified pitch profile combined with a small adjustment of operating parameters is proposed. The optimal design of the helix circuit is evaluated theoretically by a large signal analysis, and the experimental test is also carried out to make a comparison of performance between the novel and original designed traveling-wave tubes. The experiments show that the saturated output powers and efficiencies of these two tubes are close to each other, while the linearity of the traveling-wave tube is obviously improved. The total phase shift and AM/PM conversion at saturation of the novel tube, averaged over the operating band, are only 30.6°/dB and 2.5°/dB, respectively, which are 20.1°/dB and 1.6°/dB lower than those of the original tube, respectively. Moreover, the third-order intermodulation of the novel tube is up to 2.2 dBc lower than that of the original tube.

Keywords: helix traveling-wave tube digital modulation nonlinear distortion pitch profile optimization

Received: 16 December 2014
Revised: 10 April 2015
Accepted manuscript online:

PACS:	41.20.Jb	(Electromagnetic wave propagation; radiowave propagation)
	41.60.Cr	(Free-electron lasers)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61401430).

Corresponding Authors: He Jun
E-mail: skyboyhj@163.com

Cite this article:

He Jun (何俊), Huang Ming-Guang (黄明光), Li Xian-Xia (李现霞), Li Hai-Qiang (李海强), Zhao Lei (赵磊), Zhao Jian-Dong (赵建东), Li Yue (李跃), Zhao Shi-Lei (赵石雷) Design and development of high linearity millimeter wave traveling-wave tube for satellite communications 2015 Chin. Phys. B 24 104102

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Design and development of high linearity millimeter wave traveling-wave tube for satellite communications

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