Enhancing the Gain of Wireless Power Transmission System Using Negative Index Metamaterials

In this paper, a negative index metamaterial (NIMTM) superstrate is proposed to enhance the transmission capacity of the Wireless Power Transfer (WPT) System. This WPT system is useful in charging the battery of biomedical implants. A double-sided circular split ring unit structure is used to achieve the negative index property of the metamaterial(MTM). Here the metamaterial superstrate enhances the received signal level at the implant by acting as a lens and focusing the electromagnetic waves from the transmitting source to the receiving implant. This system operates in the Industrial, Scientific, and Medical (ISM) band. The simulation results are presented and an increase in the gain of 1.3dB (from 8dB to 9.3dB) is observed on the transmitting side of this WPT system by the introduction of metamaterial.