Applications of the hybrid FDTD and ADI-FDTD method to planar circuit structures

Since the original FDTD was reported in 1966 (K.S. Yee, IEEE Trans. Antennas Propagat., vol. AP-14, pp. 302-307, 1966), FDTD based methods have been developed and applied to many structures successfully (A.Taflove, Computational Electrodynamics: The Finite Difference Time Domain Method, Boston: Artech House, 1995.). Among them is the ADI-FDTD (T. Namiki, IEEE Trans. Microwave Theo. Tech., vol. 47, no. 10, pp. 2003-2007, 1999; F. Zheng et al, IEEE Trans. Microwave Theo. Tech., vol. 48, no. 9, pp. 1550-1558, 2000). Due to its CFL independence as compared to FDTD, it is getting increased attention. In this paper, we numerically validate that the hybrid ADI-FDTD and FDTD is efficient to compute planar structures. It shows that the hybrid method can be about 3 times faster in simulation time at almost the same memory requirement and accuracy level.