Perfectly matched layer for the FDTD solution of wave-structure interaction problems

The wave-structure interactions are the most usual applications of the finite-difference method, in electromagnetic compatibility and radar cross-section computations. The aim of this paper is to get a detailed insight into the implementation of the perfectly matched layer (PML) technique when dealing with such important applications. The PML is a new technique developed for the simulation of free space with the finite-difference time-domain (FDTD) method. This paper deals with the application of this technique to the solution of wave-structure interaction problems. It is shown that the absorbing layer can be set very close to the structure, provided some specifications are satisfied, with the consequence that the computational requirements of the PML technique are far shorter than those of the other methods of free space simulation.