Impedance Matching Technique for Wearable Antennas Using Metamaterial Ground

Abstract

Human body is lossy in nature, so an antenna placed directly over body suffers detuning easily and the radiation property of the antenna gets affected. The radiated energy gets dissipated within the near field of the antenna on account of the lossy nature of human tissue and it may result into local rise in specific absorption rate (SAR) and temperature. In this paper a new technique for impedance matching in wearable antennas is discussed with loading of Meta materials. Both epsilon negative (ENG) and mu negative (MNG) type Meta-Materials can be employed in this technique. Range of epsilon and mu values for which maximum matching has been obtained is computed. Overall with proper unit cell design a wide range of matching can be obtained. The theoretical approach along with the simulation results validation is shown in the paper.