Abstract
A novel kind of microwave mode converter, transforming the large-aspect-ratio TE10 mode into the standardized TE10 mode in a rectangular waveguide, is designed in this paper. It’s designed with syntonic slotted waveguide antenna arrays theory and optimized by software via finite element method. A case, transforming TE10 mode with across Section 160 mm * 10 mm into the TE10 mode in the standardized waveguide BJ120 (19.050 mm * 9.525 mm) at 12.5 GHz, has been presented. The conversion efficiency reaches 99.5 % at 12.5 GHz, and exceeds 90 % over 12.19–12.81 GHz. The band of interest can be expanded to 11.67–13.34 GHz, almost 2.7 times, by embedding three different coupling plates. It can be used to connect the high-power microwave (HPM) generator with sheet electron beams (SEB) and a traditional horn antenna. With one more coaxial-to-waveguide transducer, it can also be used to cool-test some instruments correlative to HPM generator driven by SEB.
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