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Robust transfer efficiency against the various operating conditions in awireless power transfer system remains a fundamentally important challenge.This challenge becomes even more critical when transferring power to groups ofinductively coupled receivers. We propose a method for efficient wireless powertransfer to multiple receivers exploiting the concept of exceptional points ofdegeneracy (EPD). In previous studies based on PT symmetry, a receiver'soperation has been divided into two strong and weak coupling regimes, and thepower transfer efficiency is constant in the strong coupling regime whenvarying the coupling factor.Here the concept of strong and weak coupling andconstant power efficiency is extended to a system of multiple receivers that donot follow PT symmetry. We show that the important feature to have a roughlyconstant power efficiency, independently of the positions of the receivers, isthe existence of an EPD that separates the weak and strong regimes. Ourproposed method demonstrates a system with less sensitivity to the couplingchange than a conventional system without EPD when the receivers and theircouplings to the transmitter are not necessarily identical.

One-transmitter Multiple-receiver Wireless Power Transfer System Using an Exceptional Point of Degeneracy