中国物理B ›› 2015, Vol. 24 ›› Issue (10): 104102-104102.doi: 10.1088/1674-1056/24/10/104102

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

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

何俊, 黄明光, 李现霞, 李海强, 赵磊, 赵建东, 李跃, 赵石雷   

  1. Research and Development Center of Space Traveling-Wave Tubes, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2014-12-16 修回日期:2015-04-10 出版日期:2015-10-05 发布日期:2015-10-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 61401430).

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

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)   

  1. Research and Development Center of Space Traveling-Wave Tubes, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2014-12-16 Revised:2015-04-10 Online:2015-10-05 Published:2015-10-05
  • Contact: He Jun E-mail:skyboyhj@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 61401430).

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摘要： 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.

关键词: helix traveling-wave tube, digital modulation, nonlinear distortion, pitch profile optimization

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.

Key words: helix traveling-wave tube, digital modulation, nonlinear distortion, pitch profile optimization

中图分类号:  (Electromagnetic wave propagation; radiowave propagation)

  • 41.20.Jb
41.60.Cr (Free-electron lasers)