Wideband bent circular waveguide mode coupling in Ka waveband

The design methodology and numerical result for mode converter that are suitable for high-power microwave application are reported. Based on the mode coupling theory, analyzed the critical angle of the TE₀₁ - TM₁₁ mode converter completely by axis constant curvature is given. It also arrives at an energy that can´t be converted from TE₀₁ to TM₁₁ mode by all under the critical angle with multimode factor. The actual energy complete conversion angle of optimum is in the neighborhood of critical angle, and conversion efficiency is related to the curvature of bent waveguide.