Power transfer model of electromagnetic energy harvesting used in mine tunnels

In order to apply electromagnetic energy harvesting technology in mine tunnels, the power transfer characteristics of electromagnetic energy harvesting were studied using experimental measurement and statistical analysis method. The expression of microwave path loss in tunnel was established, thus the power transfer model of energy harvesting used in mine tunnels was deduced, which is able to calculate power transfer efficiency in both arched and rectangular tunnels in short distance. Simulation and experimental analysis shows correctness of the model, and shows that the power attenuation is affected by the path loss exponent, and improving transmitted power continually is not the optimal choice to promote the charging efficiency, in practical application, different locations should adopt reasonable antenna polarizations to gain the maximal power.