Simulation of a TE10-HE06 mode input coupler in the confocal waveguide gyro-TWT amplifier

A new dual port input coupler structure is designed and simulated in 140GHz confocal waveguide Gyro-TWT amplifier. The input coupler can transform the input rectangle waveguide mode TE
₁₀
to operation mode HE
₀₆
in the confocal waveguide and give the speed modulation to electron beam. The efficiency of the mode power transform is about 70%. The band width of simulation is about 4GHz. The simulation result will be used in the gyro-TWT design.