FDTD Investigation on Electromagnetic Scattering from Two- Dimensional Layered Rough Surfaces

─ This paper presents an investigation into the electromagnetic scattering characteristic of two-dimensional (2-D) layered rough surfaces by using a finite-difference time-domain (FDTD) algorithm, which constitutes a three-dimensional scattering problem. The uniaxial perfectly matched layer medium is adopted for truncation of FDTD lattices, in which the finite-difference equations can be used for the total computation domain by properly choosing the uniaxial parameters. The upper and down rough surfaces are characterized with Gaussian statistics for the height and the autocorrelation function. The angular distribution of bistatic scattering coefficent from a 2-D singlelayered rough surface is calculated, and it shows good agreement with the numerical result through the Kirchhoff Approximation except for with large scattering angles. Finally, the bistatic scattering coefficents versus scattered and azimuthal angle for different conditions are analyzed in detail. Index Terms─ Finite difference time domain (FDTD), electromagnetic scattering, rough surface.