AN UNSPLIT STEP 3-D PML FOR USE WITH THE FDTD METHOD

An important advance in the use of the finite-difference time-domain ( FDTD) method has been the introduction of the perfectly matched layer (PAIL) to act as the absorbing boundary condition, The initial impleme ntation required the E and H fields to be split, Recent advances have suggested a new unsplit step PML. This paper describes an FDTD impleme ntation of this new unsplit PMXI in three dimensions, but implements t hem in the D and H fields, This has the advantage of isolating the PML from the rest of the FDTD computation, but, unlike the split step for mulation, requires almost no additional computational resources.