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

摘要

A novel high-power orthogonal over-mode circular waveguide (CWG) TE₁₁-TM₀₁ 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 TE₁₁ modes. In the bend, phase difference between the two TE₁₁ 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 TE₂₁ 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.