High-Order Exceptional Points in Pseudo-Hermitian Radio-Frequency Circuits

This Letter proposes a versatile approach for using high-order exceptional points (EP) with enhanced sensitivity in LC-based wireless sensing systems. EPs are remarkably responsive to minute parameter variations, which suggests promising applications in sensors. Whereas previous schemes have relied on PT-symmetric circuits comprised of coupled gain-neutral-loss RLC resonators, here the authors investigate a broader pseudo-Hermitian system configuration involving gain-loss-loss elements. This generalized method for EP implementation in electronic circuits provides a more accurate model for practical wireless sensing systems, with significant implications for wireless communication.