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Updated: May 30, 2026

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Relationship between acceleration and the scattering matrix in a SAW-MEMS accelerometer.

Jaime Octavio Guerra-Pulido¹, Pablo Roberto Pérez-Alcázar

¹UNAM (National Autonomous University of Mexico), Faculty of Engineering, Electronics Department, Ciudad Universitaria, DF México, México.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|July 20, 2011

Summary

This study introduces a method to analyze surface acoustic wave (SAW) behavior in conductive materials, crucial for SAW-MEMS microaccelerometers. Small structural changes significantly impact wave reflection and transmission, enabling precise sensor design.

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Area of Science:

Physics
Electrical Engineering
Materials Science

Background:

Surface acoustic waves (SAW) are sensitive to electrical fields from conductive materials.
Understanding SAW interaction with conductive structures is key for sensor development.

Purpose of the Study:

To develop a general method for approximating the scattering matrix of conductive SAW structures.
To establish a relationship between acceleration and SAW reflection/transmission coefficients in a SAW-MEMS microaccelerometer.

Main Methods:

Proposed a general method to approximate the scattering matrix for specific conductive geometries.
Utilized the finite element method (FEM) to study the dynamics of a slotted beam.
Analyzed the impact of microstructural variations on reflection and transmission coefficients.

Main Results:

Developed a method to link acceleration to reflection and transmission coefficients.
Demonstrated that minor changes in microstructure size cause significant alterations in SAW coefficients.
Identified the slotted beam as a linear-phase acoustic wave bandpass filter.

Conclusions:

The proposed method accurately models SAW interaction with conductive structures.
The slotted beam in SAW-MEMS microaccelerometers functions as a tunable bandpass filter.
This research facilitates the design of advanced SAW-based sensors.