FEM/BEM for simulation of LSAW devices

Area of Science:

• Materials Science
• Acoustics
• Solid State Physics

Background:

• Piezoelectric materials are crucial for acoustic wave devices.
• Modeling acoustic wave propagation in structures with electrodes is complex.
• Existing methods may lack speed or accuracy for detailed simulations.

Purpose of the Study:

• To develop an efficient and accurate computational method for modeling acoustic wave propagation.
• To simulate surface acoustic, leaky acoustic, and surface skimming bulk waves.
• To analyze wave propagation in piezoelectrics with finite metallic electrode arrays.

Main Methods:

• Combined matrix Green's function and finite element method (FEM).
• Optimized computation of Green's function components.
• Combined trapezoidal and Filon's integration for Fourier transformations.
• Galerkin method to determine unknown coefficients for elastic fields.

Main Results:

• Accurate simulation of acoustic wave propagation in piezoelectric structures.
• Significant speed optimization in computational methods.
• Good agreement between numerical simulations and experimental data.
• Effective modeling of surface acoustic, leaky acoustic, and surface skimming bulk waves.

Conclusions:

• The combined matrix Green's function and FEM approach is effective for simulating acoustic waves.
• The proposed method enhances computational speed and accuracy.
• Validated by experimental results on lithium niobate and lithium tantalate transducers.