Numerical reflection from FDTD-PMLs: a comparison of the split PML with the unsplit and CFS PMLs

Although perfectly matched layer (PML) absorbing boundary conditions are perfect in theory, an amount of spurious reflection is present in actual computations with the finite-difference time-domain (FDTD) method. This paper compares the reflections produced by three different PMLs, namely the split...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2002-03, Vol.50 (3), p.258-265
Main Author: Wrenger, J.-P.
Format: Article
Language:English
Subjects:
Boundary conditions
Difference equations
Finite difference methods
Finite element methods
Frequency
Perfectly matched layers
Reflection
Tellurium
Time domain analysis
Two dimensional displays
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Summary:Although perfectly matched layer (PML) absorbing boundary conditions are perfect in theory, an amount of spurious reflection is present in actual computations with the finite-difference time-domain (FDTD) method. This paper compares the reflections produced by three different PMLs, namely the split PML, the unsplit PML, and the recently introduced complex frequency shifted (CFS) PML. It is shown that the reflections from the split and unsplit PMLs are identical, while the CFS PML allows the reflection of evanescent waves to be significantly reduced.
ISSN:0018-926X
1558-2221
DOI:10.1109/8.999615