Eliminating interior resonances in finite element-boundary integral methods for scattering

A modification in the implementation of the finite-element-boundary-integral method is proposed for eliminating the interior cavity resonances. It is demonstrated that by using the scattered rather than the total field as the system variable, and by introducing a small loss in the propagation constant associated with the boundary integral equation, internal resonance effects are eliminated. Results are presented for two-dimensional problems with the finite element mesh terminated on a circular enclosure.<
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