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Investigation of Double-groove Loaded Folded-Waveguide Slow-wave Structure for Millimeter Traveling-wave Tubes

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Abstract

To enhance the strength of beam-wave interaction and improve the performance of gain, the double-groove loaded folded-waveguide slow-wave structure (SWS) is proposed for millimeter traveling-wave tubes (TWTs). In the first part, the expressions for the dispersion and the interaction impedance of this novel structure are obtained by using matching conditions of the RF fields. Ansoft HFSS is also used to calculate the high frequency characteristics. The simulation results from HFSS agree with the theoretical results. Numerical calculation for different combinations of the groove width and depth is carried out to study the influence of groove loading on the properties of this novel circuit. In the second part, a linear theory of a double-groove loaded folded-waveguide TWT is developed and calculated for analyzing the effect of groove dimensions on the property of small signal gain. The investigation results indicate that the interaction impedance is obviously raised up and the small signal gain are enhanced by loading groove in the FWSWS.

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Authors and Affiliations

  1. Research and Development Center of Space Traveling-Wave Tubes, Institute of Electronics, Chinese Academy of Sciences, Beijing, 100190, China

    Jun He

  2. Vacuum Electronics National Laboratory, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, 610054, China

    Yanyu Wei

Authors
  1. Jun He
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  2. Yanyu Wei
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Correspondence to Jun He.

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He, J., Wei, Y. Investigation of Double-groove Loaded Folded-Waveguide Slow-wave Structure for Millimeter Traveling-wave Tubes. J Infrared Milli Terahz Waves 35, 288–299 (2014). https://doi.org/10.1007/s10762-014-0049-0

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  • DOI: https://doi.org/10.1007/s10762-014-0049-0

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