Generalized Parity-Time Symmetry Condition for Enhanced Sensor Telemetry

TL;DR

This paper introduces a novel PTX symmetry concept to develop wireless microsensors with significantly enhanced sensitivity and resolution, surpassing traditional passive sensor limitations.

Contribution

It presents the first theoretical and experimental demonstration of PTX symmetry in wireless sensors, enabling simplified design and improved Q factors.

Findings

PTX-symmetric systems share eigenfrequencies with PT-symmetric counterparts

Experimental wireless pressure sensors exhibit ultrasensitive responses

Enhanced extrinsic Q factors achieved through PTX symmetry

Abstract

Wireless sensors based on micro-machined tunable resonators are important in a variety of applications, ranging from medical diagnosis to industrial and environmental monitoring.The sensitivity of these devices is, however, often limited by their low quality (Q) factor.Here, we introduce the concept of isospectral party time reciprocal scaling (PTX) symmetry and show that it can be used to build a new family of radiofrequency wireless microsensors exhibiting ultrasensitive responses and ultrahigh resolution, which are well beyond the limitations of conventional passive sensors. We show theoretically, and demonstrate experimentally using microelectromechanical based wireless pressure sensors, that PTXsymmetric electronic systems share the same eigenfrequencies as their parity time (PT)-symmetric counterparts, but crucially have different circuit profiles and eigenmodes. This simplifies the electronic circuit design and enables further enhancements to the extrinsic Q factor of the sensors.