**5. Methods**

*Radio Frequency (RF):* RF-based WPT is established as a technology for the transfer of power over the order of tens of meters, however, the efficiency of such systems is much lower than other WPT methods.

*Inductive Power Transfer (IPT):* This method utilizes the concept that an electric current driven through a coil, by virtue of the produced magnetic flux, induces an electromotive force in an adjacent coil.

*Magnetic Resonant Coupling (MRC):* Magnetic resonant coupling is deemed as the potential breakthrough in WPT methods [6]. The underlying concept is that two resonator circuits tuned at the same resonance frequency, can experience power transfer at higher efficiencies, at greater distances, when compared with conventional IPT systems.
