Modelling of Saw Biosensors

Abstract

New approach in surface acoustic wave (SAW) biosensor's modelling is presented. Biosensor is modelled as a three port network. The model is general and can be used also in the case of transponder type of sensor. The closed form solutions for transfer function and input admittance at the electrical port of SAW devices with uniform transducers based on complex equivalent circuit are presented. Transfer function and input admittance in two different cases are calculated and compared with the experimental results showing very close agreement.