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Moment method with isoparametric elements for three-dimensional anisotropic scatterers

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3 Author(s)
Graglia, R.D. ; Dipartimento Elettronica, Politecnico di Torino, Italy ; Uslenghi, P.L.E. ; Zich, R.S.

A new method for computing the frequency-domain electromagnetic fields scattered from, and penetrating into, arbitrarily shaped, three-dimensional, lossy, inhomogeneous anisotropic scatterers is presented. The method is based on a general volume integro-differential formulation of the scattering problem, and consists of the numerical solution of the coupled integral equations by the moment method and point matching. A particularly powerful feature of this method is that the numerical model of the scatterer is obtained by parametric volume elements and the basis functions used to represent the field within each element are the same used in the finite-element method. Element integration problems due to the singular kernel of the integral equations are treated in some detail. Numerical results for both the isotropic and the anisotropic spherical scatterer are presented, including comparisons with results obtained by different numerical methods for the isotropic cases considered. The capability of the numerical code presented here to deal with cases where the material parameters of the scatterer are given by singular matrices is discussed for two particular examples

Published in:

Proceedings of the IEEE  (Volume:77 ,  Issue: 5 )

Date of Publication:

May 1989

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