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Optimizing DCIM for Layered Green Functions for Quasi-Electrostatic Analysis

A method for optimizing the DCIM approximation for the spatial domain layered Green function for low-frequency quasi-electrostatic analysis is presented. The method is based on a novel decomposition of the spectral Green function. The proper DCIM parameters of these terms are found by optimizing the Matrix Pencil method solution for the discrete residues and poles. The method has been found to provide at least six digits of accuracy for layered medium with highly disparate layer thickness and material constants.