Circular waveguide TM₀₁-TE₁₁ mode converter

A circular waveguide TM01-TE11 mode converter filled with metal shell and metal plate is proposed . The circular waveguide is split into two semi-circle sectors: one semi-circle sector is a regular empty waveguide, the other is an empty semi-circle waveguide filled with a metal shell and metal plate to adjust its radius. The numerical simulation results show that the reflection is below 0.01 and the conversion efficiency reaches 99.56% at the center frequency 2.8 GHz, and the S11 is below -10 dB and the conversion efficiency exceeds 90% at the frequency range from 2.716 GHz to 2.946 GHz. The results of S11 obtained by experiment are in agreement with that of the simulation, which validates the design and simulation of the mode converter.