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Transmission characteristics of very low frequency electromagnetic wave of mine-seam wireless through-the-earth communication system

JIA Yulong;LI Fengxia;TAO Jinyi;WANG Peng;School of Electrical and Power Engineering,Taiyuan University of Technology;  
Transmission model of very low frequency electromagnetic wave in mine-seam was built which was based on Maxwell equations,and transmission characteristics of very low frequency electromagnetic wave were researched when it transmitted on the interface of mine roadway and mineseam,in mine-seam and on the interface of mine-seam and the ground.The conclusions are as following:when very low frequency electromagnetic wave transmits from mine roadway into mine-seam,it is approximatively in the vertical incidence condition;when very low frequency electromagnetic wave transmits on the interface of mine-seam and the ground,total reflection will occur with a little critical angle,and a part of very low frequency electromagnetic wave cannot pass through the ground.
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