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Tapering Vertical Dimension Technique for the Quasi-periodic Folded-Waveguide TWT to Improve the Bandwidth and Efficiency

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Abstract

A tapering vertical dimension technique (TVDT) is proposed for the quasi-periodic folded-waveguide traveling wave tube (FW-TWT) to improve the bandwidth and efficiency. The dispersion characteristics for the concentric arc FW-TWT with the TVDT are analyzed and discussed. When the power of input signal is set as 1 W and the initial beam voltage (current) is set as 4900 V (0.15 A), the peak output power of the proposed FW-TWT with the TVDT can reach 100.9 W at 88 GHz. Accordingly, the corresponding peak electron efficiency is 13.7%. Furthermore, the 3-dB bandwidth (fractional bandwidth) can reach 17 GHz (18.78%) from 82 to 99 GHz, where the output signal is steady and the corresponding frequency spectrum is quite clean. In addition, the performance of the concentric arc FW-TWT with the TVDT is also compared with that of the other quasi-periodic FW-TWTs.

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Authors and Affiliations

  1. Aerospace Information Research Institute, Chinese Academy of Science, No.5, Yanqi East 2nd Road, Yanqi Economic Development Zone, Huairou District, Beijing, China

    Zheng Wen, Jirun Luo, Ying Li, Min Zhu, Wei Guo & Fang Zhu

  2. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, No.380, Huairou District, Beijing, China

    Zheng Wen, Jirun Luo & Ying Li

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  1. Zheng Wen
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  2. Jirun Luo
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  4. Min Zhu
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Correspondence to Zheng Wen.

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Wen, Z., Luo, J., Li, Y. et al. Tapering Vertical Dimension Technique for the Quasi-periodic Folded-Waveguide TWT to Improve the Bandwidth and Efficiency. J Infrared Milli Terahz Waves 42, 915–928 (2021). https://doi.org/10.1007/s10762-021-00817-3

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