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Implementations in Method of Moments of the Electric-Field Integral Equation (EFIE) are traditionally carried out with divergence-conforming sets, with normal continuity of the current across edges. This gives rise to awkward implementations around junctions in composite dielectric objects. Also, RWG-implementations of the Combined-Field Integral Equation for sharp-edged objects suffer from some loss of accuracy. In this paper, we present a new nonconforming discretization of the EFIE, with no continuity requirements across edges. In the generation of the impedance elements, we employ a volumetric testing over a set of tetrahedral elements attached to the meshed surface to let the hyper-singular Kernel contributions numerically manageable. We show that the decomposition of the current into normally-continuous and discontinuous contributions leads to enhanced accuracy in the computed RCS.
CitationUbeda, E.; Rius, J.; Heldring, A. Volumetric testing for a nonconforming discretization in method of moments of the electric-field surface integral equation. A: International Conference on Electromagnetics in Advanced Applications. "Proceedings of the 2013 International Conference on Electromagnetics in Advanced Applications". Turin: 2013, p. 121-124.
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