Sharp step bended bar in a waveguide as a two-aperture iris

The problem of the dominant TE₁₀ mode diffraction by a thin sharp step bended metallic bar placed in a rectangular waveguide is considered. It is shown that unlike a straight bar such a bar provides the resonance of complete reflection of the TE₁₀ mode in the single-mode band of frequencies. Influence of the bar geometrical dimensions on the frequency and Q factor of resonances is studied. The geometries providing resonances with the high Q factor were found.