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A Post-Loaded Rectangular Reentrant Cavity for Broadband Multiple-Beam Klystron

Bansiwal, A and Raina, S and Vinoy, KJ and Datta, SK (2020) A Post-Loaded Rectangular Reentrant Cavity for Broadband Multiple-Beam Klystron. In: IEEE Electron Device Letters, 41 (6). pp. 916-919.

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Official URL: https://dx.doi.org/10.1109/LED.2020.2989103


In an effort to enhance the bandwidth of a multiple-beam klystron having rectangular double reentrant cavity with circular cylindrical ferrule, reduction of the unloaded quality factor of the cavity was proposed by placing circular cylindrical posts extending from one of the cavity side-walls to the opposite wall in an orientation perpendicular to the electric field. A typical cavity was analyzed using 3D electromagnetic field solver CST Studio and the post-loading was found to reduce the unloaded quality factor by around 90 compared to that for no-post-loading. The proposed method was found to be the only method other than the use of passive loss to achieve this order of reduction in the quality factor with a minor increase in the cavity transverse dimensions. Post made of highly resistive material was found to have pronounced effect in reducing the quality factor. The 3D electromagnetic analysis was validated against measurements on a typical S-band cavity.

Item Type: Journal Article
Publication: IEEE Electron Device Letters
Publisher: Institute of Electrical and Electronics Engineers Inc.
Additional Information: Copy right for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords: Electric fields; Electromagnetic fields, Cylindrical posts; Electromagnetic analysis; Electromagnetic field solver; Multiple beam klystron; Quality factors; Reentrant cavity; Transverse dimensions; Unloaded quality factors, Klystrons
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 30 Sep 2020 09:38
Last Modified: 30 Sep 2020 09:38
URI: https://eprints.iisc.ac.in/id/eprint/65591

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