Scattering from a PEC strip located at planar interface of free-space and lossy dispersive dielectric-magnetic medium using Kobayashi potential method

Abstract

Kobayashi potential method has been used to study the scattering of electromagnetic plane wave from a perfect electric conducting (PEC) strip placed at planar interface of the free space and dielectric-magnetic medium. The strip has been assumed to be thicker than the skin depth and also, it is thinner than a tenth of the free-space wavelength. Furthermore, it has been assumed that dielectric-magnetic medium is homogeneous, lossy and dispersive. Lorentz-Drude model has been used to incorporate losses and dispersion both in permittivity and permeability of the dielectric-magnetic medium. Depending upon the frequency, the lossy dispersive dielectric-magnetic medium may behave as ENG Re (ϵ)<0, MNG Re(μ)<0, DNG Re(ϵ,μ)<0, and DPS Re(ϵ,μ)>0. Scattered field pattern was observed at different operating frequencies by varying different parameters of the considered geometry. The monostatic and bistatic scattering widths were studied by varying angle of incidence, size of the strip and number of iterations. It was observed that losses become more effective in case of free space–DPS interface as compared to other cases for the interface. Minimum value of the main lobe of scattering widths was produced when the strip was placed on free space–DPS interface.