Abstract:
|
Traditional method-of-moment implementations of
the electric-field integral equation (EFIE) are based on sets
of divergence-conforming basis functions, such as the loworder
Rao-Wilton-Glisson (RWG) set, which arise from imposing
normal continuity in the expanded current across the edges
arising from the triangulation around the boundary surface.
These schemes are edge-oriented and become well-suited for
the analysis of conformal meshings, where pairs of adjacent
triangles share common edges. However, they cannot be applied
to nonconformal triangulations, arising from the interconnection
of independent meshings, for example in the modular modelling
of composite objects, because adjacent triangles may not have
common matching edges. In this paper, we present several facetoriented
implementations of the EFIE that allow the robust and
versatile analysis of such objects. Two schemes arise from testing
the fields over a set of tetrahedral or wedge elements attached
to the boundary surface, inside the conductor. Another scheme,
“tangential-normal”, derives from testing the fields over pairs
of adjacent triangles such that one triangle matches a particular
facet of the surface meshing and the other one is oriented inwards
perpendicularly to the surface triangulation. |