Analysis of electromagnetic wave ignition mechanism and calculation of power threshold in underground coal mine

Abstract

This study critically assesses the potential risks associated with the implementation of 5G radio frequency signals in coal mines. The empirical findings underscore that, under uniform excitation conditions, when situating a PCB loop antenna at the focal points of maximum near-field and far-field emissions from a Yagi antenna, both simulations and analytical computations converge on a safe power threshold of 450W for the transmitting antenna in the near field. This limit augments to 7200W in the far field context. In a hypothetical scenario devoid of transmission losses, the safe power threshold for the transmitter is projected to be 100W. It is imperative to acknowledge that the safety threshold for the RF source is intricately linked to the internal resistance of the receiving antenna. As a corollary, the probability of an inadvertent high-gain conductive spark discharge is substantially minimized, intimating that real-world safe thresholds might be greater than the values proposed herein.