Modiried generalized total-field/scattered-field FDTD boundary in PML region

This paper propose a modified generalized total-field/scattered-field (G-TF/SF) boundary for finite-difference time-domain (FDTD) to model an infinite material scatterer within a compact FDTD grid when 0 <= theta inc <= 90 degrees (theta(inc) is the wave propagation angle). This requires the sourcing of numerical plane wave traveling into the perfectly matched layer (PML) absorber bounding the grid. In this method, the modified G-TF/SF boundary can simplify the disposal of G-TF/SF boundary formulation. This technique is applied to model the electromagnetic wave propagation in free space and model 2-D TM diffraction of an infinite right-angle dielectric wedge. And there is a good correspondence between the results obtained by various methods.