Abstract
An oversized TE-to-TM mode converter based on waveguide bend structure is designed for high power transmission line. The curvature distribution of the waveguide bend is analyzed and optimized using mode coupling theory. Analysis results show that the curvature near the output port plays a decisive role in the content of the parasitic modes, which indicates that the restriction on curvature far from output port could be relaxed. Therefore, the asymmetric waveguide axis with enhanced curvature near the front end and lessened curvature near the output port will have a high conversion efficiency and a broad bandwidth. Combining the curvature optimization and the phase rematching technology proposed in our preliminary work, the TE-to-TM mode converter realizes a 90 bend with a conversion efficiency over 95% in the range of 26–32.2 GHz (the relative bandwidth over 21%). To verify the designed mode converter, a prototype is manufactured and measured.
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Xiaoyi Liao
Xiaoyi Liao received the B.S. degree in 2015 and the Ph.D. degree in 2020 from the University of Electronic Science and Technology of China, Chengdu, China, and now he is engaged as an associate professor by the Nanjing University of Information Science and Technology, Nanjing, China.
Zewei Wu
Zewei Wu received the Ph.D. degree from the University of Electronic Science and Technology of China, Chengdu, China, in 2015. He is currently with the School of Electronic Science and Engineering, University of Electronic Science and Technology of China. His current research interests include high-power microwave components, antennas, and numerical simulations in electromagnetic engineering.
Minxing Wang
Minxing Wang received the B.S. degree from the University of Electronic Science and Technology of China, Chengdu, China, in 2018, where he is currently pursuing the Ph.D. degree. His current research interests include high-power microwave propagation and quasi-optical components.