Modeling of medium frequency propagation along a thin wire parallel to a lossy return path.
Brocker-DE; Waynert-J; Sieber-PE; Li-J; Werner-DH; Werner-PL
28th Annual Review of Progress in Applied Computational Electromagnetics, April 10-14, 2012, Columbus, Ohio. Monterey, CA; Applied Computational Electromagnetics Society, 2012 Apr; :79-84
The National Institute for Occupational Safety and Health has been investigating the performance of medium frequency (MF) communications systems in which electromagnetic waves are known to couple parasitically to conductors present in underground coal mine tunnels. In an effort to understand the MF signal behavior and factors that might control the attenuation and coupling of signals to the conductors, a representative computational electromagnetic model using the planar multilayered Green's function is developed and compared with analytic approximations available in the literature. Results are discussed for return path dissipation factors ranging from that of a good dielectric to that of a good conductor at MF. Finally, the approximate analytic forms, in conjunction with the computer model calculations, are used to construct equivalent transmission line representations for a given set of wire geometries and return path material parameters.
Electromagnetic-wave-transmission; Coal-mining; Underground-mining; Electromagnetic-fields; Electromagnetic-energy; Electrical-waves; Electrical-measurement
Donovan E. Brocker, Department of Electrical Engineering The Pennsylvania State University, University Park, PA 16802
28th Annual Review of Progress in Applied Computational Electromagnetics, April 10-14, 2012, Columbus, Ohio