Simulation of Dispersion Characteristic of the Spiral Waveguide

Based on the coupled equations and dispersion equation of spiral waveguide, the numerical calculation is carried out to get the dispersion line and the coupling mechanism of the two modes is analyzed. Based on the characteristics of the linear polarization TE11 mode, line polarization TE11 pulse is applied as a probe to simulate the dispersion characteristics of the cold cavity with a three-dimensional particle in cell code. The results of computer simulations agree well with the numerical calculations. Moreover, by computer simulation a mixed mode of the electric field is obtained. Combined the computer simulations with the numerical calculations, the law of influence of the dispersion characteristics by adjusting the parameters of the slotted screw geometry is obtained.