Simulation of a Love mode surface acoustic wave transducer

A Love mode transducer equivalent circuit is presented in order to overcome limitations of previous models, which have been developed for devices with piezoelectric substrates. The model presented has the advantage of including the effect of electrical and mechanical fields in both the non-piezoelectric substrate and piezoelectric layers. Also, it can be used for various layer thicknesses, which are comparable to wavelength. Parameters of the model are calculated by a wave propagation simulator package. Admittance and transfer function of the Love mode transducer have been calculated for various material combinations for the substrate and top layers. This allows an evaluation of the device performance prior to fabrication as well as optimisation of the transducer, particularly in the cases which thickness of the layers and the choice of layer materials have substantial effect on the performance of the device.