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IEEE Transactions on Antennas and Propagation
Volume 47 Number 10, October 1999

Evanescent Waves in PML's: Origin of the Numerical Reflection in Wave-Structure Interaction Problems

Page 1497.

Abstract:

The theory of general evanescent waves in perfectly matched layers (PML's) is presented, both in a continuous medium and in a discretized finite-difference medium. It is shown that evanescent waves may be strongly reflected from vacuum-PML interfaces in the discretized case. This allows the numerical reflection observed in wave-structure interaction problems to be interpreted as the reflection of evanescent fields surrounding the structures.

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