Systematic theoretical analysis of dual-parameters RF readout by a novel LC-type passive sensor

TL;DR

This paper provides a comprehensive theoretical analysis of a dual-parameter LC-type passive sensor, identifying key factors affecting signal strength and crosstalk, and proposing a decoupling scheme to improve sensor performance.

Contribution

It introduces a systematic theoretical framework for understanding and optimizing dual-parameter LC sensors, including a decoupling algorithm to reduce signal crosstalk.

Findings

Signal strength mainly depends on Q factors, coupling coefficients, and resonant frequency interval.

Crosstalk is mainly influenced by coil coupling and frequency interval.

A decoupling algorithm effectively reduces signal crosstalk.

Abstract

This paper systematically studied the simultaneous measurement of two parameters by a LC-type passive sensor from the theoretical perspective. Based on the lumped circuit model of the typical LC-type passive dual-parameter sensor system, the influencing factors of the signal strength of the sensor as well as the influencing factors of signal crosstalk were both analyzed. It is found that the influencing factors of the RF readout signal strength of the sensor are mainly quality factors (Q factors) of the LC tanks, coupling coefficients, and the resonant frequency interval of the two LC tanks. And the influencing factors of the signal crosstalk are mainly coupling coefficient between the sensor inductance coils and the resonant frequency interval of the two LC tanks. The specific influence behavior of corresponding influencing factors on the signal strength and crosstalk is illustrated by a series of curves from numerical results simulated by using MATLAB software. Additionally, a decoupling scheme for solving the crosstalk problem algorithmically was proposed and a corresponding function was derived out. Overall, the theoretical analysis conducted in this work can provide design guidelines for making the dual-parameter LC-type passive sensor useful in practical applications.