Abstract:Medium frequency transmission line (MF TL) communications in circular cylindrical underground tunnels critically depend on the soil return impedance. The soil impedance can be approximately calculated using a very simple closed-form expression based on an image method-the so-called Dubanton approach. In this paper, we present an analytical exact method, based on electromagnetic field analysis, using Bessel and Hankel functions to correctly evaluate the soil impedance and the wave propagation parameters (attenu… Show more
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