On Solving Higher Order Volume-Surface Integral Equations for Composite Conductor and Anisotropic Media Structures

Higher order volume-surface integral equations (VSIEs) are utilized to analyze the scattering of composite objects including conductor and anisotropic materials in this paper. The VSIEs are solved by the method of moments (MoM) with higher order geometry and higher order basis functions. Namely, the curved triangle patches and the curved tetrahedron elements are used to model composite conductor and anisotropic media (CCAM) objects. Meanwhile, the volume and surface currents are discretized by higher order hierarchical vector (HOHV) basis functions. Compared to the previous methods using lower order bases, our method needs consumes less memory and CPU time while keeps the same accuracy by choosing a suitable order. Moreover, the nonconformal mesh can be used for anisotropic volume to simplify the geometrical discretization. The simulation results show that the proposed method is accurate, efficient, and flexible.