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Inductive wireless power transfer (WPT) systems can be effectively describedas non-Hermitian systems using the coupled-mode theory. In these systems,parity-time (PT) symmetric states facilitate efficient power transfer.Traditionally, passive resonators have been used as relay devices in suchsystems to extend transmission distance; however, this approach may induceadditional eigenstates with broken PT symmetry, particularly when specificspatial arrangements of the relay resonators, dependent on the positions of thetransmitting (Tx) and receiving (Rx) resonators, are not maintained. Thislimitation hampers applications like free positioning WPT. To address thischallenge, we introduce a multibody WPT system employing metamaterialcontrolled PT symmetry, which circumvents the constraints of physicalarrangement. We utilize inverse design to configure the metamaterial, targetinga specific resonance mode that controls the effective coupling coefficients.Our approach ensures that a PT-symmetric state emerges when these coefficients,relating to the metamaterial and both the Tx and Rx resonators, are balanced.We confirm the stability of this state in a strong coupling regime, boththeoretically and experimentally. Our experiments demonstrate the formation ofPT-symmetric states governed by the metamaterial's resonant mode, achievableeven with varying sizes and positions of the Tx and Rx in relation to themetamaterial. Moreover, we show that the PT symmetric state is attainable withdifferent spatial configurations of the Rx resonator. This finding underscoresour system's potential for free-positioning WPT, significantly broadening itsapplicability.

Metamaterial-Controlled Parity-Time Symmetry in Non-Hermitian Wireless Power Transfer Systems