COMSOL modeling of SAW Resonators

Here we demonstrate some generic 2D and 3D routines for SAW analysis employing the commercial COMSOL Multiphysics platform for finite element analysis (FEA). More specifically, we consider the analysis and optimization of high performance LSAW resonators for RF filters. The LSAW nature - being well studied and sufficiently complicated - is chosen as a suitable example for analysis and the results are compared to state-of-the-art knowledge. We found very good agreement between the results of the analytical scheme proposed here and the state-of-art findings. Finally, we demonstrate a TC-SAW piston-mode device simulated using SiO2/128 degrees Y-X LiNbO3

Bulk Acoustic Wave Transformer employing Periodically Polled array of Piezoelectric Rods

Multilayer bulk acoustic wave transformer employing a periodical array of piezoelectric rods with alternating polarization is experimentally demonstrated for the first time. Voltage transformation coefficient in excess of 6 was measured at a frequency of 150kHz, providing thus a solid experimental verification of the recently proposed principle of operation. Finite element analysis is used to reveal the underlying device physics

Surface acoustic waves in inhomogeneous media [contents page, subject index and preface only]

This monograph covers important problems caused by the interaction of different types of surface acoustic waves with surface inhomogeneities. The problem of surface acoustic wave interaction with periodic topographic gratings, widely used in filters and resonators, is given careful consideration. The most important results of surface wave scattering by local defects such as grooves, random roughness and elastic wedges are described. Different theoretical approaches and practical rules for solving the surface wave problems are also presented