A novel slotted helix slow-wave structure for high power Ka-band traveling-wave tubes

doi:10.1088/1674-1056/22/10/108401

Abstract A novel slotted helix slow-wave structure (SWS) is proposed to develop a high power, wide-bandwidth, and high reliability millimeter-wave traveling-wave tube (TWT). This novel structure, which has higher heat capacity than a conventional helix SWS, evolves from conventional helix SWS with three parallel rows of rectangular slots made in the outside of the helix tape. In this paper, the electromagnetic characteristics and the beam-wave interaction of this novel structure operating in the Ka-band are investigated. From our calculations, when the designed beam voltage and beam current are set to be 18.45 kV and 0.2 A, respectively, this novel circuit can produce over 700-W average output power in a frequency range from 27.5 GHz to 32.5 GHz, and the corresponding conversion efficiency values vary from 19% to 21.3%, and the maximum output power is 787 W at 30 GHz.

Keywords: slotted helix slow-wave structure millimeter-wave traveling-wave tube beam-wave interaction

Received: 06 December 2012
Revised: 17 April 2013
Accepted manuscript online:

PACS:	84.40.Fe	(Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.))
	84.47.+w	(Vacuum tubes)
	07.57.Hm	(Infrared, submillimeter wave, microwave, and radiowave sources)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61271029), the Natural Science Key Laboratory Foundation, and the Natural Science Fund for Distinguished Young Scholars of China (Grant No. 61125103).

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

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Liu Lu-Wei (刘鲁伟), Wei Yan-Yu (魏彦玉), Wang Shao-Meng (王少萌), Hou Yan (侯艳), Yin Hai-Rong (殷海荣), Zhao Guo-Qing (赵国庆), Duan Zhao-Yun (段兆云), Xu Jin (徐进), Gong Yu-Bin (宫玉彬), Wang Wen-Xiang (王文祥), Yang Ming-Hua (杨明华) A novel slotted helix slow-wave structure for high power Ka-band traveling-wave tubes 2013 Chin. Phys. B 22 108401

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A novel slotted helix slow-wave structure for high power Ka-band traveling-wave tubes

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