A new update algorithm in FDTD implementation of anisotropic PML as an absorbing boundary condition

After the introduction of the perfectly matched layer (PML), alternative PML techniques were presented based on the concept of complex coordinate scaling, and uniaxial anisotropic media used as PML. In this paper, an anisotropic PML is used for mesh truncation of the FDTD computational domain. To update the field components, magnetic flux densities are used as dummy variables at intermediate steps, while in Gedney (1996) electric flux densities were used. By our scheme, the number of variables in the FDTD grid in the corner layers is reduced, yielding less CPU time and memory requirement. To compare the two methods, a 2D TE problem is studied. The graphs of error due to reflection from an anisotropic PML are presented.