Abstract
As far as RADAR Cross Section (RCS) computations are concerned, metamaterial coating modeling issues lead to cases of millions of unknowns for targets greater than the wavelength. For computational limiting reasons, details of the coating cannot be meshed, even if they play a key role like in metamaterial design. Equivalent boundary conditions or effective medium approximation are then necessary. In this paper we consider spheres and cone-spheres with plasmonic coatings. Exact and approximated RCS computations are compared over a broad range of microwave frequencies. In the last section, we eventually point out the relevance of full-metallic grooved coatings in designing calibration objects exhibiting low RCS without the use of conventional RADAR Absorbing Materials.
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