Before revision:  In this paper, we propose a metamaterial enhanced magnetic induction communication mechanism that can achieve over meter scale communication range by using millimeter scale coil antennasin the harsh underground environment. An analytical channel model for the new mechanism is developed to explore the fundamentals of metamaterial enhanced MI communication in various underground environments.
After revision:  In this paper, we propose a metamaterial enhanced magnetic induction communication mechanism that can achieve over meter scale communication range by using pocket-sized antennas. In this paper, an analytical channel model for the new mechanism is developed to explore the fundamentals of metamaterial enhanced MI communication in various underground environments.