Numerical dispersion optimized leapfrog ADI-FDTD method and its application for capturing surface current distributions of complex objects illuminated by an electromagnetic pulse (EMP)

A numerical dispersion optimized leapfrog alternating direction implicit finite-difference time-domain (ADI-FDTD) method is proposed in this paper, where a set of artificial anisotropic parameters is introduced into its implementation. Under such circumstances, its numerical dispersion can be suppressed efficiently. Some numerical experiments are performed and compared with the original leapfrog ADI-FDTD method, it is shown that our proposed method can achieve much higher computational accuracy. Further, such method is adopted for predicting surface current distributions of some 3-D complex objects illuminated by an electromagnetic pulse (EMP), such as a tank and an aircraft, etc., and good agreement is obtained in comparison with commercial software.