Multi-Band Parity-Time-Symmetric Wireless Power Transfer Systems

In this paper, we propose and demonstrate the multi-band wireless power transfer (WPT) systems based on quantum-inspired symmetries. A non-Hermitian quantum system satisfying the parity-time $(PT)$-symmetry (space-time reflection symmetry) can have multiple real eigenfrequencies that depend on the coupling strength and non-Hermiticity index. By analogy, the PT-symmetric WPT system can provide multimodal or even wideband operations with high transmission efficiencies through adjustment of the effective quality-factor of resonantly coupled oscillators (analogous to non-Hermiticity) and their mutual inductive/capacitive coupling. We present here basic theory and experimental validations for achieving dual-band and (b) tri-band PT-symmetric WPT systems with engineerable operating frequencies.