Compact H-plane waveguide corners with very wide bandwidth

This paper describes compact H-plane right-angled corners with a couple of matching metallic posts with axis parallel to the electric field of a TE₁₀ mode. Some corners are successfully designed by properly arranging the posts in their square elbow region. Corners with one or two posts can be matched at an arbitrary center frequency over a certain bandwidth. Furthermore, it is shown that the bandwidth of an optimized corner with three metallic posts covers a full X-band or more with very low return loss better than 40 dB. The above corners are designed using the H-plane planar circuit approach because of the planar structure in the H-plane. The validities of the design concept and procedures are confirmed by EM-simulations (HFSS), and the wideband corner with three posts is verified experimentally also.