Abstract
AbstractThe electromagnetic field radiated by a vertical electric dipole in the presence of a four-layered region is examined in detail. The region of interest consists of a perfect conductor, coated with two dielectric layers, and air above. It is noted that the properties of the electromagnetic field for the four-layered case are similar to those for the three-layered case. The wave numbers of the trapped surface waves, which are a contribution of the sum of the residues of poles, are between the wave numbers k 0 in the air and k 2 in the lower dielectric layer. Analysis and computations show that the trapped surface wave plays a major role in communication at large distances when both the dipole and the observation point are on or close to the boundary between the air and the upper dielectric layer. KeywordsElectric DipoleDielectric LayerLateral WavePerfect ConductorBranch LineThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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