An unsplit formulation of the Berengers PML absorbing boundary condition for FDTD meshes

An unsplit formulation of the Berengerʹs perfectly matched layer absorbing boundary condition (PML ABC) for finitedifference time-domain (FDTD) meshes is presented. This unsplit formulation uses the conventional E-H algorithm, but does not require the E and H fields to be split. The proposed formulation is memory-efficient like that of the previous unsplit PML following the theory of Sacks. This unsplit formulation is easy to be implemented, and many useful modification to the Berengerʹs PML can also be done to it.