A new anisotropic perfectly matched layer medium for mesh truncation in finite difference time domain analysis

In this paper an unsplit anisotropic perfectly matched layer (PML) medium, previously utilized in the context of finite element analysis, is implement ed in the finite difference time domain (FDTD) algorithm. The FDTD anisotro pic PML is easy to implement in the existing FDTD codes, and is well suited for truncating inhomogeneous and layered media without special treatment r equired in the conventional PML approach. A further advantage of the presen t approach is improved performance at lower frequencies. The applications o f the unsplit anisotropic PML/FDTD method are illustrated by considering th e problems of a plane wave propagation and an open microstrip line.