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An e-cient numerical solution is been developed to compute the impedances of rectangular transmission lines. Method of moments is applied to integral equations for the current density, where the cross section is discretized, to improve the convergence, by a nonuniform grid that obeys the skin efiect. Powerfulness of this approach up to rather high frequencies is verifled by comparing with asymptotic formulas and other references. Detailed discussion is given for the current density distribution and its efiect to the impedance, especially for a high frequency range.
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Matsuki et al. (2012) studied this question.
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