Hybrid time-domain adaptive integration method for simulating transient electromagnetic responses of an arbitrary structure with large scale

An effective hybrid method, based on time domain adaptive integral method - marching on in degree scheme (TD-AEM-MOD), is presented for studying on transient scattering characteristics of large-scale perfectly conductive structures. 4-D FFT, including 3-D spatial FFT and blocked 1-D “temporal” (order) FFT, is used to accelerate the convolution during the MOD iteration. The technique of singular value decomposition (SVD) compression is also adopted to relief the memory requirement for the near field correction data. Numerical results are presented to demonstrate both accuracy and efficiency of the hybrid method for fast capturing transient electromagnetic responses of some typical PEC structures.