Near-Field WPT System Design for Concurrent Charging of Two Independent Loads

This paper presents the design of the near-field wireless power transfer (WPT) system capable of charging two independent loads simultaneously. It is imperative to note that it becomes possible by developing single-input multiple-output WPT, i.e., a single transmitter (Tx) and two receivers (Rxs). The developed Tx and Rx resonators possess small areas of 30-by-30 sq. mm and 30-by-13 sq. mm, respectively. The concurrent powering is achieved by coupling Tx and two Rxs at 27 mm. As a consequence, the obtained measurement results demonstrate power transfer efficiencies of 50% and 25%.