Fast analysis of combined dielectric/conducting scattering problem using preconditioned loose GMRES method

This paper presents the preconditioned Loose Generalized Minimum Residual Method (LGMRES) method to solve scattering problems of combined dielectric/conducting structure using volume-surface integral equation. The scattering problem is formulated using volume integral equation and surface integral equation for dielectric material object and conducting object, respectively. In the method of moments´ solution to the combined integral equations, the target is discretized using triangular patches for conducting surfaces and tetrahedral cells for dielectric volume. The resultant matrix system is solved by use of the presented iterative solver. The diagonal preconditioner is implemented to further accelerate the convergence. Numerical results are presented to demonstrate the accuracy and efficiency of the proposed technique.