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Design and Characterization of a W-Band Folded-Waveguide Slow-Wave Structure

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Abstract

A single-section slow-wave structure for a W-band folded-waveguide traveling-wave tube with operating bandwidth of around 4% was designed for delivering the output power of 50 W at the operating voltage of 13.5 kV and operating beam current of 80 mA. The design was carried out using analytical formulations and 3D electromagnetic simulations. The beam-wave interaction analysis was carried out using large signal Lagrangian analysis and particle-in-cell simulation. The folded-waveguide slow-wave structure along with input-output couplers and RF windows were fabricated. Cold test measurements were carried out for dispersion characteristics of the slow-wave structure and voltage standing-wave ratio and insertion loss characteristics of the RF window. The measured cold circuit parameters show close agreement with the analysis.

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Acknowledgments

Authors are thankful to the Director, MTRDC, for the kind support to carry out the work and necessary permission to publish the work.

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Authors and Affiliations

  1. Microwave Tube Research & Development Centre Ministry of Defence, Government of India, DRDO, Bharat Electronics Complex, Jalahalli Post, Bangalore, 560013, India

    Murugan Sumathy & Subrata Kumar Datta

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  1. Murugan Sumathy
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  2. Subrata Kumar Datta
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Correspondence to Murugan Sumathy.

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Sumathy, M., Datta, S.K. Design and Characterization of a W-Band Folded-Waveguide Slow-Wave Structure. J Infrared Milli Terahz Waves 38, 538–547 (2017). https://doi.org/10.1007/s10762-016-0349-7

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  • DOI: https://doi.org/10.1007/s10762-016-0349-7

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