Dispersion Analysis of helical corrugation waveguide for Gyro-TWT and Gyro-BWO

The paper puts forward a simple method of solving the coupled coefficient and the dispersion equation of the backward wave in the helical corrugation waveguide gyro-BWO. And using the VBA macro in the software CST, two taper parts and a regular part helical waveguide is founded. A simulation method is used to analysis the dispersion curve.