Improved simulation method for high frequency characteristic of helix slow wave structure

Based on the angular periodicity of the helix slow-wave structure, an improved simulation method for simulating the high frequency characteristic is proposed using the boundary condition of Master/Slave in the commercial software HFSS. The simulation model for helix slow wave structure with three rods is modified from one screw-pitch to one third. Compared with the simulation results of classical model, the computation time decreases at least 3/4 by the improved model while the results are identical. Morever, the advantage of the improved method will be more evident when the frequency is much higher.