Jm. Song et al., SCATTERING OF TE-POLARIZED EM WAVE BY DISCONTINUITY IN GROUNDED DIELECTRIC LAYER, IEEE transactions on microwave theory and techniques, 42(3), 1994, pp. 481-488
The two-dimensional problem of EM wave interaction with a dielectric d
iscontinuity in an infinite dielectric layer is studied. An electric f
ield integral equation (EFIE) for TE illumination has been derived bas
ed on the Green's function for the electric field produced by induced
polarization currents in the discontinuity region. Impressed electric
fields consist of either plane waves incident from space above the die
lectric layer or surface waves supported by that layer. Method of Mome
nts (MoM) numerical solutions for the induced electric field in the di
scontinuity region are implemented. The amplitudes of surface waves ex
cited by excess discontinuity-region polarization currents are calcula
ted, as well as the pattern of the scattered field and the associated
scattering width. It is observed that the excitation of a surface-wave
mode reduces the back scattered radiation for TE-polarized plane wave
incidence. The accuracy of the theory is verified by comparison of nu
merical results with those of existing studies.