Selective mode filtering for gyrotron traveling-wave tube systems

Minxing Wang, Zewei Wu, Xiaoyi Liao, Ran Zhang and Yong Luo

Journal of Electromagnetic Waves and Applications, 2022, vol. 36, issue 8, 1089-1101

Abstract: In this paper, a method to filter the parasitic modes for gyrotron traveling-wave tube (gyro-TWT) system is proposed. The difference of surface current between the operating TE01 mode and the parasitic modes is analyzed to achieve the mode discrimination. Based on the analysis, a slot array with high mode-selectivity is introduced, and a Ka-band oversized waveguide mode filter is designed to attenuate the parasitic modes. A prototype is fabricated and measured for validation purpose. The measurement of S-parameter demonstrates that parasitic modes can be effectively suppressed by the mode filter, while the TE01 mode suffers little attenuation after propagating through the proposed device. The high-power capacity of the mode filter is verified by a high-power test based on a gyro-TWT. The proposed mode filter features high performance in purifying TE01 mode as well as a high-power capacity, which makes it suitable for gyro-TWT systems.

Date: 2022
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DOI: 10.1080/09205071.2021.2004558

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