**1. Introduction**

The idea of Wireless Power Transfer (WPT) is not a new concept. From the end of the 19th Century, Nikola Tesla was already experimenting with the possibilities. In recent years, the concept of WPT has gained increased popularity and has raised much excitement [1–3].

Following significant advancements in wireless data transfer over the past two decades, power is the last physical connection to be eliminated. However, the obsession with wireless power is not new.
