SCATTERING OF TE-POLARIZED EM WAVE BY DISCONTINUITY IN GROUNDED DIELECTRIC LAYER

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.