A High-Power Orthogonal Over-Mode Circular Waveguide TE11-TM01 Mode Converter

A novel high-power orthogonal over-mode circular waveguide (CWG) TE
₁₁
-TM
₀₁
mode converter is presented. This mode converter is made up by two orthogonal CWGs and two metal plates. One metal plate is used to achieve phase shift of two semicircular waveguide TE
₁₁
modes. In the bend, phase difference between the two TE
₁₁
modes is changed from π to 2π, which meets the requirement of mode conversion at the end of the metal plate. The other metal plate is used to reflect and suppress CWG TE
₂₁
mode, and thus power-handling capacity is greatly improved because lager radius of CWG can be utilized. After optimizing basic parameters, simulation results show that the mode converter has virtues of high power-handling capacity, high conversion efficiency, and a very small bend radius. Finally, test result of the VSWR has a good agreement with simulation result and insertion loss is 0.12 dB at 8.4 GHz. All of that prove the feasibility of the mode converter.