Abstract
Nonradiative 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 a high-order symmetric tridiagonal pseudo-Hermitian Hamiltonian, relaxing the limitation of multisource/multiload systems based on non-Hermitian physics. We propose a three-mode pseudo-Hermitian dual-transmitter-single-receiver circuit and demonstrate that robust efficiency and stable frequency WPT can be attained despite the absence of PT symmetry. In addition, no active tuning is required when the coupling coefficient between the intermediate transmitter and the receiver is changed. The application of pseudo-Hermitian theory to classical circuit systems opens up an avenue for expanding the application of coupled multicoil systems.
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