Periodic Analysis of Surface Acoustic Wave Resonator with Dimensionally Reduced PDE Model Using COMSOL Code

Area of Science:

• * Acoustics and Materials Science
• * Electrical Engineering and Applied Physics

Background:

• * Radio-frequency (RF) surface acoustic wave (SAW) resonators are critical components in mobile phones, used as filters and duplexers.
• * Current simulation methods struggle with the complexity and scale of diverse SAW resonator structures, especially those with long interdigital transducers (IDTs).
• * Efficient and accurate simulation techniques are urgently needed for the design and production of advanced SAW devices.

Purpose of the Study:

• * To extend a generalized partial differential equations (PDE) based two-dimensional finite element method (2D-FEM) model for the periodic analysis of SAW resonators.
• * To introduce model order reduction (MOR) techniques combined with periodic boundary conditions for efficient, dimensionally reduced PDE models.
• * To validate the proposed methodology by comparing simulation results with experimental data for various SAW resonator types.

Main Methods:

• * Extension of a 2D-FEM model incorporating generalized partial differential equations (PDEs).
• * Application of model order reduction (MOR) techniques to decrease model dimensionality.
• * Implementation of periodic boundary conditions for analyzing long interdigital transducer (IDT) arrays.
• * Comparative analysis of simulation results against experimental data for regular SAW, IHP-SAW, and TC-SAW resonators.

Main Results:

• * The proposed methodology successfully enables accurate and fast simulation of periodic SAW resonator structures.
• * Dimensionally reduced PDE models were achieved using MOR without compromising computational accuracy.
• * The simulation results closely matched experimental data for various SAW resonator configurations, demonstrating the method's effectiveness.
• * The approach addresses the limitations of current computational resources for complex SAW device analysis.

Conclusions:

• * The developed methodology provides an effective and accurate solution for simulating periodic SAW resonator structures.
• * This approach significantly improves computational efficiency, enabling rapid characterization of complex SAW devices.
• * The validated technique is suitable for diverse SAW resonator types, supporting advancements in mobile communication technology.