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Analysis of Two-Beam Ka Band Folded Waveguide Traveling-Wave Tube

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Abstract

The limiting factors in gain and bandwidth of folded-waveguide traveling-wave tube with single-beam are analyzed. A method of improving gain growth rate and broadening bandwidth by introducing two electron beams is proposed. Numerical results reveal that saturated output power of high-frequency interaction system with two electron beams is increased to 2.8 times than single-beam structure under the same as the operating voltage and current of single beam, that is, interaction efficiency is increased to 1.4 times ,and saturated length is reduced by 5 geometrical periods. Bandwidth is broadened due to two electron beams with different speeds, which can meet the synchronization conditions in a wider frequency range. A broad band amplifier is designed. Simulations show that the amplifier produces a saturated radiation power of 256 W at the frequency 27 GHz. The 3-dB gain bandwidth is 16.5% covering the range 25-29.5 GHz. In addition, the instability in gain caused by reflection is analyzed.

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Acknowledgments

This work was supported by the National Science Fund of China under Contract Nos.11475182, 60871051 and 11275004.

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Authors and Affiliations

  1. Key laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing, 100190, China

    Xue Qianzhong, Meng Xin, Wang Shujian, Li Ke & Liu Wenxin

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Meng Xin, Wang Shujian & Li Ke

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  1. Xue Qianzhong
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  2. Meng Xin
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  4. Li Ke
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Correspondence to Xue Qianzhong.

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Qianzhong, X., Xin, M., Shujian, W. et al. Analysis of Two-Beam Ka Band Folded Waveguide Traveling-Wave Tube. J Infrared Milli Terahz Waves 36, 31–41 (2015). https://doi.org/10.1007/s10762-014-0116-6

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  • DOI: https://doi.org/10.1007/s10762-014-0116-6

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