Multi-Receiver Wireless Power Transfer Systems Using Metasurface-Based Resonator

A new generation of wireless power transfer (WPT) represents a significant advancement in the field of technology, offering a more efficient and convenient way to transmit power without the need for physical connections. The technology utilizes resonant magnetic coupling, which allows for the transfer of power over longer distances to multiple devices simultaneously. As a result, the one-to-many WPT technology should be characterized by improved safety measures and efficiency, as well as reduced electromagnetic interference. This paper develops one-to-many WPT systems based on metasurface-based resonators and demonstrates the technology to charge three smartphones simultaneously. The metasurface-based resonator is utilized as a transmitting resonator that creates a quasi-uniform magnetic field and suppresses the electric field, providing safety to the biological tissues. The performance of the metasurface-based resonator is studied numerically and experimentally. The measured DC-DC power transfer efficiency of the one-to-many WPT system based on the metasurface-based resonator is 42% for a single receiver free-positioned above the transmitter at a 5 cm separation distance. The total DC-DC power transfer efficiency of the one-to-may WPT system with three receivers varies in the range 34% - 41% depending on the position of the receivers.