Anisotropic perfectly matched layer absorbing boundary condition used for biaxial media

We have extended the PML to the conditions for a biaxial medium and proved that such a medium is passive. We have also examined the basic performance of a conductor-backed PML versus incident angle. Furthermore, we have used an FDTD and an FEM algorithm simulation to demonstrate the effectiveness of a biaxial PML layer when used to terminate a parallel-plate waveguide loaded with biaxial dielectric. As an application, the proposed ABC was used to compute the reflection coefficient of layered uniaxial composite material. We found that the computing time and space region was reduced and obtained perfect agreement between an exact analytical method and FDTD algorithm. This permits the study of a much broader class of materials than was previously possible. A more detailed investigation of the effect of the PML parameters on its performance is needed in order to define guidelines for its practical use.