Reflection analysis of FDTD boundary conditions. II. Berenger's PML absorbing layers

摘要

For pt. I see ibid., vol. 45, no. 8, Aug. 1997. This paper presents an in-depth analysis of Berenger's perfectly matched layer (PML) boundary truncation technique. The impedance and dispersion relationships for the fields within the PML media are derived to gain a better understanding of the nature of field propagation within such regions. The mechanisms which contribute toward reflection from a PML region are then described. Using this knowledge of the PML absorbing layers, a numerical method is developed, which allows the reflection from such layers to be calculated exactly.