Study on Ka-band broadband mode converter for gyro-TWT

A study of a Ka-band broadband mode converter for gyro-TWT has been presented. By using this mode converter, a TE
₀₁
cylindrical waveguide mode which is used as the operation mode for the gyro-TWT can be obtained from a TE
₁₀
rectangular waveguide mode. The measurement result indicates that -3dB bandwidth of 6GHz has been obtained, which agrees well with the simulation results and doubles the level of the previous design. In addition, the influences of the critical dimensions on the transmission performance have also been analyzed. The mode converter is suitable for the broadband gyro-TWT.