Finite Element Analysis of Resonant Frequencies in Surface Acoustic Wave (SAW) Devices

G. Scheerschmidt, K.J. Kirk, and G. McRobbie
University of Paisley

This document presents a way to model the resonances for magnetostrictive Surface Acoustic Wave (SAW) devices with the structural mechanics module of COMSOL Multiphysics.

Lamb and surface modes were identified by simulation of the frequency response. A first approach was also taken to introduce damping to the model. The results from the model were compared to the data from a real device obtained by two different measurement methods.

Laser vibrometry was used to measure the surface displacement over the operating frequency range of the device. A network analyser was deployed in the frequency sweep mode to determine the impedance of the device. The resonances found in the model corresponding to surface modes agree with the resonances excited in the real device.