A Multi-Solver Framework for Electromagnetic Scattering from Complex Objects

A multi-solver framework is presented for solving scattering from objects with multiple regions. The regions with complicated materials and structures are modeled by the finite element method, and the homogeneous regions with impedance and conducting boundaries are modeled by the method of moments. To construct a global system, the Robin-type transmission condition is employed to couple adjacent regions. An absorbing boundary condition-based preconditioner and the multilevel fast multipole algorithm are used in the iterative solution. An example is given to show the accuracy and the flexibility of the proposed method.