Abstract
Selective wireless power transfer (WPT) to multiple receivers has gained emerging interests recently owing to increasing demand of wireless charging from industry. In this paper, we show the parity-time-symmetric systems that incorporates a nonlinear saturable gain can be used to realize selective power transfer by exploiting the bistability inherent within such systems. The bistability can guide the system to the state where the energy is concentrated at a desired target receiver. For a system with three multiple receivers, we show that up to 83% of the total energy is concentrated at the target receiver. A resultant transfer efficiency of 65% is achieved to the target receiver, while the power delivered to the rest receivers can be 30 times lower.
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