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Transmissionline ParametersAuthor: Edmund A. Laport
An alternative method is that from magnetostatics, using the system of logarithmic vector potentials and currents. The solutions also yield the unitlength inductance, characteristic impedance, current distributions, and the velocity of propagation. The unitlength resistance and leakance are empirical and depend upon the number of wires and their resistivity, the frequency, the current distribution in the wires, the method and material of insulation, and the conductivity of the soil under the line (when groundreturn currents are present). Any concentrated dielectric or ferromagnetic materials in the field of the line can also influence the fundamental parameters to some extent, but ideally they are assumed not to exist. In practice, care is taken to minimize their presence. When the line conductors are of permeable material, the permeability acts with the conductivity as a factor in increasing skin effect and thus increasing the highfrequency resistance.


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