The thin-wire formalism is a widely used subcell model that allows the finite-difference time-domain (FDTD) method to take account of wires thinner than the cell size. In this paper, the original formalism is generalized to a multiwire formalism that allows the FDTD method to take account of bundles composed of arbitrarily close wires.
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Jean-Pierre Bérenger (2000) studied this question.
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