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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.
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No potential conflict of interest was reported by the author(s).
Data availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Notes on contributors
Keqiang Wang
Keqiang Wang is currently working as a postdoctoral researcher at the Yangtze Delta Research Institute (Huzhou) of the University of Electronic Science and Technology of China. He graduated with a PhD in electronic science and technology from the University of Electronic Science and Technology of China (UESTC) in 2022. His main research interest is in high-power microwave transmission and radiation technology.
Hao Li
Hao Li received a Ph.D. degree in physical electronics from the University of Electronic Science and Technology of China, Chengdu, China, in 2009. He is currently working as a professor at the Yangtze Delta Research Institute (Huzhou) of the University of Electronic Science and Technology of China. His current research interests include high-power microwave components, antennas, and numerical simulations in electromagnetic engineering.
Tianming Li
Tianming Li received a Ph.D. degree in physical electronics from the University of Electronic Science and Technology of China, Chengdu, China, in 2005. He is currently working as a professor at the Yangtze Delta Research Institute (Huzhou) of the University of Electronic Science and Technology of China. His current research interests include high-power microwave generation and wireless power transmission.
Guangjun Wen
Guangjun Wen received a Ph.D. degree in physical electronics from the University of Electronic Science and Technology of China, Chengdu, China, in 1998. He is currently working as a professor at the School of Information and Communication Engineering, University of Electronic Science and Technology of China. His research interests include radio frequency integrated circuits and systems for various wireless communication systems, the design of RFID tags and readers and circuit components and antenna designs for the Internet of Things.
Haiyang Wang
Haiyang Wang received a Ph.D. degree in physical electronics from the University of Electronic Science and Technology of China, Chengdu, China, in 2009. He is currently working as a professor at the Yangtze Delta Research Institute (Huzhou) of the University of Electronic Science and Technology of China. His current research interests include high-power microwave source devices and electromagnetic compatibility.
Chaoxiong He
Chaoxiong He is currently working as a postdoctoral researcher at the Yangtze Delta Research Institute (Huzhou) of the University of Electronic Science and Technology of China. He graduated with a PhD in leectronic science and technology from the University of Electronic Science and Technology of China (UESTC) in 2022. His main research interest is in high-power microwave generation.