Theoretical analysis of planar bulk-acoustic-wave response

Area of Science:

• * Physics
• * Materials Science
• * Electrical Engineering

Background:

• * Bulk-acoustic-wave (BAW) devices are crucial for radio frequency (RF) filtering.
• * Accurate theoretical modeling is essential for optimizing BAW device performance.
• * Existing models may not cover all piezoelectric substrate orientations.

Purpose of the Study:

• * To develop a comprehensive theoretical analysis for planar BAW devices.
• * To enable computation of BAW response for any piezoelectric substrate orientation.
• * To optimize existing BAW devices and discover new low-loss designs.

Main Methods:

• * Detailed theoretical analysis of planar BAW devices.
• * Development of a method for computing BAW response across various substrate orientations.
• * Application of the theory to optimize device thickness and interdigital transducer (IDT) separation.
• * Computation and comparison of BAW responses for four specific devices.

Main Results:

• * A novel method for calculating BAW response for any piezoelectric substrate orientation was established.
• * Computed BAW responses for four devices showed excellent agreement with experimental data.
• * Optimization of device thickness and IDT separation led to reduced insertion loss.
• * A new BAW device exhibiting low insertion loss was identified.

Conclusions:

• * The developed theoretical framework provides a versatile tool for BAW device analysis and design.
• * The method accurately predicts BAW device performance across diverse piezoelectric materials and orientations.
• * This work facilitates the optimization of current BAW devices and the innovation of next-generation, high-performance RF filters.