An unsplit formulation of the Berenger´s PML absorbing boundary condition for FDTD meshes

An unsplit formulation of the Berenger´s perfectly matched layer absorbing boundary condition (PML ABC) for finite-difference 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 Berenger´s PML can also be done to it.