The extension of time-domain integral equation analysis to scattering from imperfectly conducting bodies

An extension of integral equation time-domain analysis to treat electromagnetic scattering from imperfect conductors embedded in a dielectric is presented. It employs isoparametric curvilinear representations, and an implicit time-stepping approach is used to achieve stability. The principal difficulties arise from the diffusive “wake” term which the finite conductivity introduces into the Green´s function. The consequent computational complexity and costs, both significantly greater than for perfectly conducting scatterers, are discussed. Examples of the application of the methods are presented