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International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 734379, 5 pages
http://dx.doi.org/10.1155/2012/734379
Research Article

Influence of Mine Tunnel Wall Humidity on Electromagnetic Waves Propagation

School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China

Received 9 October 2011; Revised 26 December 2011; Accepted 26 December 2011

Academic Editor: Hon Tat Hui

Copyright © 2012 Lingfei Cheng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

High moisture in mine tunnel can cause the change of the permittivity and conductivity of tunnel walls, therefore influence the characteristics of electromagnetic waves propagation. This paper analyzes the mechanism of humidity influencing the permittivity and conductivity and attenuation of electromagnetic waves propagation in the circular tunnel and rectangular tunnel. The study result shows that, in the interest frequency range, the change of permittivity caused by humidity has little effect on propagation attenuation, but the effect on the conductivity change cannot be ignored. When the humidity is greater than a certain value, the attenuation will be increased significantly.