Malas, TahirGürel, Levent2016-02-082016-02-082007http://hdl.handle.net/11693/26943Date of Conference: 11-16 November 2007Conference Name: 2nd European Conference on Antennas and Propagation, EuCAP 2007We propose an effective preconditioning scheme for the iterative solution of the systems formulated by the electric- field integral equation (EFIE). EFIE is notorious for producing difficult-to-solve systems. Especially, if the target is complex and the utilized frequency is high, it becomes a challenge to solve these dense systems with even robust solvers such as full GMRES. For this purpose, we use an inner-outer solver scheme and use an approximate multilevel fast multipole algorithm for the inner solver to provide a very efficient approximation to the dense linear system matrix. We explore approximation level and inner-solver accuracy to optimize the efficiency of the inner-outer solution scheme. We report the solution of large EFIE systems of several targets to show the effectiveness of the proposed approach.EnglishElectric-field integral equationElectromagnetic scatteringMultilevel fast multipole algorithmPreconditioning of the integral equation methodsDense systemsApproximation algorithmsElectromagnetic wave scatteringIntegral equationsLinear systemsAntennasConference Paper10.1049/ic.2007.1165