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Validation and extension to three dimensions of the Berenger PML absorbing boundary condition for FD-TD meshes

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3 Author(s)
Katz, D.S. ; Cray Res. Inc., El Segundo, CA, USA ; Thiele, E.T. ; Taflove, Allen

Berenger recently published a novel absorbing boundary condition (ABC) for FD-TD meshes in two dimensions, claiming orders-of-magnitude improved performance relative to any earlier technique. This approach, which he calls the "perfectly matched layer (PML) for the absorption of electromagnetic waves", creates a nonphysical absorber adjacent to the outer grid boundary that has a wave impedance independent of the angle of incidence and frequency of outgoing scattered waves. This paper verifies Berenger's strong claims for PML for 2-D FD-TD grids and extends and verifies PML for 3-D FD-TD grids. Indeed, PML is >40 db more accurate than second-order Mur (1981), and PML works just as well in 3-D as it does in 2-D. It should have a major impact upon the entire FD-TD modeling community, leading to new possibilities for high-accuracy simulations especially for low-observable aerospace targets.<>

Published in:

Microwave and Guided Wave Letters, IEEE  (Volume:4 ,  Issue: 8 )

Date of Publication:

Aug. 1994

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