Modification of resonance poles of a conducting target by a dielectric coating

In resonance domain, the radar scattering response of any object can be modelled by natural poles of resonance with the formalism of the singularity expansion method. The mapping of these poles in the complex plane, gives useful information for the discrimination of radar targets, as the general shape, the characteristic dimension and the constitution of the target. In this paper, we propose to study the effect on the resonance poles of a dielectric coating on a conducting target. For that, we present results of mapping of poles as a function of the thickness and the permittivity of the coating.