The Horizontal Wire over Earth as a Transmission Line: A Model Surface-Impedance Approach

摘要

A simple model formulation and exact solution ia given for the per-unit-length surface impedance that characterizes the finite conducting earth in a transmission-line approximation of the response of a horizontal wire over earth to incident electromagnetic fields. The two-dimensional inhomogeneous plane waves in the model are discussed, and a transparent formulation and solution of the wave-vector dispersion relation is presented in terms of a complex refraction-angle formalism. Finally, we consider a TM (transverse magnetic) purely vector-potential model of the wire over ground in order to show that the TM surface-impedance model explicity excludes TE (transverse electric) waves and is, in fact, identical to the familiar transmission line. (Author)