Influence of Transmitter Position and Dielectric Constant on Electromagnetic Waves Propagation in Mine Tunnel

In order to research the influence of propagation character of electromagnetic wave caused by the different positions transmitter and dielectric constant in mine tunnel, the approximate solutions of the electomagnetic attenuation character are analyzed which polarized in different ways based on the rectangular tunnel transmission mode. The propagation characters of different position transmitter in rectangular mine tunnels are simulated. Base on the propagation mode of rectangular tunnels, the influences of dielectric constant between side walls and roof-floor of rectangular tunnels on attenuation rate of electromagnetic wave propagation in different polarization modes were studied. When dielectric constant of side walls and roof-floor is equal, attenuation of vertical polarization mode is markedly higher than that of horizontal polarization mode, and with the decreasing of the dielectric constant the attenuation rate of two mode is closing; When the transmitter is more close to the wall of the mine tunnel, the mode of propagation is more complex and the attenuation ratio is more serious, whereas in the middle of the mine tunnel, the attenuation rate of radio is the least. The solution above provides a theoretic basis to the wireless succor communication technique in mine tunnel.