A TE10-TE20 mode transducer utilizing a right-angled corner and its application to a compact H-plane out-of-phase power divider

This paper describes a constitution method of a novel TE₁₀-TE₂₀ mode transducer utilizing an H-plane right-angled corner composed of a standard waveguide and an over-moded one. By placing several metallic posts in the corner junction for both good mode-conversion and low return loss, and optimizing their positions and diameters by the use of the H-plane planar circuit approach together with the short-circuiting method of fictitious ports, a compact and easy-to-fabricate mode transducer is realized. Next, an out-of-phase power divider is designed by utilizing this mode transducer, and relatively wide-band characteristics are obtained for both power-split balance and 180° phase difference. Finally, the validity of the design result is confirmed by experiments.