Higher-order anti-PT symmetry for efficient wireless power transfer in multiple-transmitter system

Abstract

Wireless power transfer (WPT) offers significant advantages, particularly due to its flexibility, enabling diverse applications. However, conventional single-transmitter, single-receiver systems are limited by their sensitivity to lateral disturbances, frequency instability, and strict distance constraints. Recently, multiple-transmitter, single-receiver (MTSR) systems have gained attention for their potential to enhance system flexibility and reliability. In this work, we propose an efficient second-order anti-parity‒time (anti-PT) symmetry by introducing two transmitters that simultaneously exchange energy with the external channel. This concept is further extended to third-order anti-PT symmetry for efficient WPT in MTSR systems. By leveraging interference between shared sources, we construct virtual coupling instead of relying on traditional resistive losses. Remarkably, our system maintains frequency stability, broad bandwidth, and robust high-efficiency power transfer even when the resonant frequencies of the transmitter and receiver coils are mismatched. This innovation challenges conventional understanding and opens new directions for WPT technology.

Graphical abstract

Keywords

non-Hermitian physics / anti-PT symmetry / wireless power transfer

RIGHTS & PERMISSIONS

Higher Education Press