Frequency-stable robust wireless power transfer based on high-order pseudo-Hermitian physics

TL;DR

This paper introduces a high-order pseudo-Hermitian physics approach to wireless power transfer, enabling frequency-stable, robust efficiency without active tuning, even with system parameter variations.

Contribution

It extends PT-symmetry concepts to high-order pseudo-Hermitian systems, demonstrating a multi-mode circuit that maintains stable wireless power transfer without active tuning.

Findings

Achieves frequency-stable wireless power transfer with high efficiency

No active tuning needed despite coupling coefficient changes

Open frequency band gap with abrupt change at phase transition

Abstract

Non-radiative wireless power transfer (WPT) technology has made considerable progress with the application of the parity-time (PT) symmetry concept. In this letter, we extend the standard second-order PT-symmetric Hamiltonian to high-order symmetric tridiagonal pseudo-Hermitian Hamiltonian, relaxing the limitation of multi-source/multi-load system based on non-Hermitian physics. We proposed a three-mode pseudo-Hermitian dual-transmitter-single-receiver circuit and demonstrate that robust efficiency and stable frequency WPT can be achieved even though PT-symmetry is not satisfied as usual. In addition, no active tuning is required when the coupling coefficient between the intermediate transmitter and the receiver is changed. Moreover, the proposed system has an open frequency band gap with an abrupt frequency change at the phase transition point, which is expected to advance wireless sensing technologies.