Fast multi-frequency extraction of 3D impedance based on boundary element method

For the boundary element method used in an impedance extractor FastImp, a scheme to handle the boundary integrals is proposed to accelerate the computation for multiple frequencies. Several techniques are combined in the scheme. The near-field integrals are calculated with a series expansion technique and an approximate formula, whereas the precorrected FFT algorithm is employed for the far-field integrals. Numerical experiments show that the proposed method is several times faster than FastImp for multi-frequency extraction, while preserving high accuracy. (C) 2008 Wiley Periodicals, Inc.