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Analysis of passive surface acoustic wave sensors using coupling of modes theory

Passive surface acoustic wave (SAW) sensors, which are a combination of a SAW device and a classical sensor, have attracted recent interest. These sensors can detect physical quantities without a power supply and does not require maintenance. In this study, passive SAW sensors are modeled using coupling of modes (COM) theory. To optimize the COM parameters, Brent’s method is adopted. The simulated and measured results are in good agreement. Then, the model is applied as a novel identification method for SAW devices using a characteristic of a passive SAW sensor. The simulated results indicate the applicability of the new identification method for SAW sensors.