An Effect of Time Reversal Based Multiple Beacon Selection on Wireless Power Transfer Performance

This paper investigates the effectiveness of multiple beacon (multi-beacon) systems in Wireless Power Transfer (WPT), focusing on improving overall RF-DC efficiency. Through simulations within a 5.64 GHz scenario, limiting a dynamic range of TXA element radiation power to a maximum of 20 dBm, and using a RXA rectifier within a specific range, multi-beacon configurations significantly enhanced RF-DC efficiency compared to single-beacon setups. The results showed that multi-beacon systems achieved 43.07% RF-DC efficiency and a RXA DC power of 1.20 W at a distance of 0.5 m, compared to 13.49% and 2.40 W with a single-beacon configuration, demonstrating the appropriateness of multi-beacon selection in our system design. On the other hand, trade-offs are evident: while multi-beacon systems bring high RF-DC efficiency, they also degrade absolute power and require high hardware complexity. This underscores the importance of adaptive beacon selection, taking into consideration the dynamic range specifications of both TXA and RXA.