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The aim of this paper is to provide an understanding of the use of NaCl based ionic solution in biocompatible antenna structures and to explain some of the previously unfamiliar limitations of such antennas especially when they are operated nearby or inside the human body. In this paper, role of matching the permittivity of wearable loop antenna with body tissues is discussed and the performance of the liquid ionic solution loop antenna is compared with the metallic loop antenna  using FEKO