The down-link VLF Through-the-Earth Communication system is recognized as the ost reliable way of conveying dispatching information due to its special transmission media. Because the geophysical configuration and the mining layout vary from mine to mine, one needs t be acquainted the channel propagating property to employ the system. As an application of the employ the systems. As an application of the Counter-Propagation Deduction (CPD) Method in th eevaluation of the fields in layered media, this paper investigates the propagating characteristics of the layered earth for a loop antenna, the results can serve as a helpful guideline for the transmission system design.
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