Malas, TahirErgül, ÖzgürGürel, Levent2016-02-082016-02-0820071522-3965http://hdl.handle.net/11693/27053Date of Conference: 9-15 June 2007Conference Name: Antennas and Propagation Society International Symposium, IEEE 2007In this work, we propose a preconditioner that approximates the dense system operator. For this purpose, we develop an approximate multilevel fast multipole algorithm (AMLFMA), which performs a much faster matrix-vector multiplication with some relative error compared to the original MLFMA. We use AMLFMA to solve a closely related system, which makes up the preconditioner. Then, this solution is embedded in the main solution that uses MLFMA. By taking into account the far-field elements wisely, this preconditioner proves to be much more effective compared to the near-field preconditioners.EnglishMLFMAIntegral equationsLinear systemsRobustnessSparse matricesComputational electromagneticsElectromagnetic scatteringConvergenceConference Paper10.1109/APS.2007.4395738