The ultra wideband transfer function representation of complex three-dimensional electromagnetic structures

the network-oriented ultra wideband transfer function representation of complex three-dimensional electromagnetic structures is investigated. The transfer function is consisting of two parts: entire function and rational or pole function. The reduction of a rank of an ill-conditioned matrix is performed in accordance with the spectral criterion. System identification is carried out by the Matrix Pencil Method (MPM) and a criterion for the model order selection is introduced. The presented method yields considerable reduction of computational effort and allows to generate compact models of electromagnetic systems.