A broadband and compact TE01 mode bend with hexagonal section for high-power microwave applications

Keqiang Wang, Hao Li, Tianming Li, Guangjun Wen, Haiyang Wang and Chaoxiong He

Journal of Electromagnetic Waves and Applications, 2024, vol. 38, issue 11, 1220-1231

Abstract: The conventional circular waveguide 90° TE01 bend makes it difficult to achieve broadband because of the serious interference from TM11 mode. To solve this problem, the mode coupling characteristics in the hexagonal waveguides are investigated in this paper, and it is found that when the deformation amplitude is appropriate, not only the degradation between TE01 and TM11 is broken but other parasitic modes can be efficiently suppressed. Based on the analysis, an oversized broadband TE01 waveguide bend with variable curvature is proposed, and its transmission efficiency is over 95% from 8.5 to 11 GHz, while its structure length is only 26.16 times wavelength. Measurement results indicate that the S21 of the bend is about −0.4 dB from 8.5 to 11 GHz, and it works stably under a microwave output power of 1 MW. The consistency between theoretical calculations, simulation, and experiments indicates the feasibility of this novel TE01 bend.

Date: 2024
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DOI: 10.1080/09205071.2024.2365285

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