Influence of Coupling Coefficient on Signal Readout of Wireless Passive Sensor
Luo Ta · Chuangan jishu xuebao · 2014
The influence of coupling coefficient on signal readout of wireless passive sensor is investigated. By establishing the lumped circuit model of the coupling system,and analysis it theoretically,the formula of impedance on the antenna side is derived. MATLAB simulation is used to perform theoretical analysis,and results shows that the variation of resonance frequency of the sensor which is retrieved from the impedance parameters on the antenna side is influenced by coupling coefficient,and the results are verified by experiment. Theoretical analysis and experimental result shows that proper coupling coefficient should be chosen to obtain a better measurement sensitivity when design the coupling system for wireless passive sensor.