Fast Computation of Electromagnetic Scattering by Graphene-Filled Honeycomb Coated Target

In this paper, an efficient method is presented for computing electromagnetic scattering from objects coated with thin graphene-filled honeycomb structures. In the proposed approach, the graphene-filled honeycomb coating is first homogenized as an anisotropic medium characterized by 3×3 tensorial relative permittivity and permeability. The homogenized model is then reduced to an equivalent impedance surface described by a 3×3 surface-impedance tensor derived from the effective material parameters. Based on this model, a general self-dual combined field integral equation for anisotropic surface impedance, referred to as G-C-SDIE, is formulated. Several representative targets coated with graphene-filled honeycomb structures are investigated. Numerical results are compared with those obtained using the conventional surface integral equation (SIE) method and the hybrid finite element-boundary integral (FE-BI) method to validate the accuracy of the proposed approach. In addition, an electrically large aircraft model is analyzed to demonstrate the flexibility and computational efficiency of the method.