A Coupling Matrix-Based Readout Technique for Single-Port Multi-Resonator Passive Sensor Array

This paper presents a novel application of RF-filter parameter extraction techniques with coupling matrix model to obtain decoupled capacitive sensor readings from the S11 of a single-port, multi-resonator passive RF resonant sensor array. As an example application, two dual-resonator sensor arrays loaded with four selected functional polymers are implemented to allow ethanol and acetone identification. Through the parameter extraction techniques, the changes in capacitances of the sensor pair are obtained as chemical signatures to differentiate the presence of ethanol from acetone.