On the Use of Matching Networks and Relays for Maximizing the Gains of IR WPT Links

This paper analyzes the problem of maximizing the gains of a single transmitter–single receiver inductive resonant Wireless Power Transfer link (WPT). Two different approaches are considered and compared: the use of impedance matching networks and the use of additional resonators (relay elements). It is shown that, if from a theoretical point of view the two approaches are equivalent, in some practical cases the maximization of the gains by means of relays may not be feasible.