A Hybrid HIE-FDTD/TDPO Method for Transient Far-Fields of Combinative Objects

A novel hybrid schema that combines the hybrid implicit-explicit finite-difference time-domain (HIE-FDTD) method with time-domain physical optics (TDPO) is presented. The HIE-FDTD method employs a hybrid implicit explicit schema along the fine structure direction to mitigate the constraint imposed by fine spatial mesh on the time step size. Consequently, this hybrid method proves advantageous for scenarios involving objects that combine electrically small structure characterized by very fine structures in one direction with an electrically large size target. Compared with the traditional FDTD/TDPO hybrid method, the HIE-FDTD/TDPO hybrid method significantly improves computational efficiency. Numerical results validate the efficiency and accuracy of this novel hybrid approach.