A simple preconditioner for electric‐field integral equations

Abstract

Abstract A preconditioner is applied to the electric‐field integral equation, to improve the convergence of iterative integral‐equation solvers, such as the conjugate‐gradient (CG) method. The preconditioner accounts for (expansion function)–(testing function) interactions in the vicinity of a given basis function, requiring order N complexity for N unknowns. Example results are presented for microwave scattering calculations for targets in the vicinity of a half space (soil), with results computed via a multilevel fast multipole algorithm. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 51–54, 2001.