A Hybrid Algorithm Based on FDTD and HIE-FDTD Methods for Simulating Shielding Enclosure

A novel hybrid technique based on the classical finite-difference time-domain (FDTD) algorithm and hybrid implicit explicit finite-difference time-domain (HIE-FDTD) algorithm is developed to simulate the complex objects, which have both fine and coarse structures. The classical FDTD method is utilized to update the field components in coarse main grids, and the HIE-FDTD is applied in the fine local grids. Through controlling the classical FDTD and the HIE-FDTD calculation regions stringently, this method employs the uniform marching time-step size in the entire computational space. This time step size satisfies the Courant-Friedrich-Levy condition of the classical FDTD in coarse grids. Therefore, without an excessive increase of the computational burden, the computation efficiency of the proposed method is increased. Practical applications of the hybrid algorithm in the analysis of the shielding effectiveness of the enclosure are presented, and the simulation results certify the high accuracy and efficiency of the novel scheme.