Analytic model for STW/BGW/LSAW resonators

The propagation and excitation of surface transverse waves (STWs), interacting with bulk-acoustic waves (BAWs), are considered. A parametrized model is proposed for the harmonic admittance of STWs in an infinite periodic grating. The model enables the study of various phenomena, such as unidirectionality, parasitic BAW radiation, and the frequency-dependence of the electromechanical coupling. The analytic formula allows ideal one-port synchronous resonators to be modeled numerically. Results are compared with simulations and experiments.