Double-Ridge Waveguide Mode Analysis based on FDTD-SVD Method

In this paper, hybrid finite-difference time-domain method(FDTD) and singular value decomposition(SVD), denoted by FDTD-SVD, is applied to analyze the double-ridge waveguide dominant mode. Double-ridge waveguide (WRD) without fillets and WRD with small fillets are analyzed. The simulation results show WRD without fillets can achieve a single-mode operation of TE10 from 35GHz to 112 GHz. For WRD with small fillets, its single-mode operation frequency band is 35-116GHz. These results are almost consistent with the detailed parametric study result(38-120GHz)based on Ansys HFSS, which proves that the FDTD-SVD method is simple and more effective. In addition, the transmission performance of WRD can be improved by adding fillets and enlarging the radius of fillets.