On using the coating of different materials to reduce the cross polarized scattering from a PEMC cylinder buried below a rough surface

Abstract

Theoretical formulation is presented to evaluate the scattered fields from a perfect electromagnetic conductor (PEMC) cylindrical core coated with different materials and buried below a rough surface. Complex conjugate material (CCM), chiral mate rial, plasma material and topological insulator (TI) material as coating are considered. To calculate the scattered field, perturbation theory (PT) and plane wave represen tation of fields are used. Far and near zone scattering patterns for the coating of different materials are observed. A comparison is presented with result obtained for the coating of dielectric material. For CCM coating, refractive index of the material is changed to note the change in scattering pattern while chirality is varied for the chiral coating. The effect of an-iostropy is observed for the coating of plasma mate rial while the cases of time reversal symmetry of TI material and symmetry broken are investigated by varying the value of magneto-electric parameter. Results are also reported by varying the thickness of the coating material, period of the surface, ad mittance of PEMC core. Finally a comparison is done between scattered fields for the coating of different materials as a function of thickness. It is observed that TI can be utilized for reducing cross polarized scattering while CCM is good for maximization of co polarized scattering. The amount of reduction depends on the polarization of the incident field, geometrical and physical parameters