Modeling, simulation, and design of SAW grating filters

Area of Science:

• Electrical Engineering
• Acoustics
• Materials Science

Background:

• Surface Acoustic Wave (SAW) devices are crucial for signal processing.
• Accurate modeling of SAW grating filters, including losses, is essential for performance.
• Existing design methods may not fully capture the complexities of SAW components.

Purpose of the Study:

• To describe a systematic procedure for modeling, simulating, and designing SAW grating filters.
• To incorporate signal losses into the design and analysis of SAW devices.
• To develop a modular approach for analyzing complex SAW filter architectures.

Main Methods:

• Utilized cascadable transmission-matrix building blocks to define grating structures and interdigital transducers (IDTs).
• Employed chain-matrix multiplication to determine immittance characteristics of complex SAW filter architectures.
• Developed a multipole filter design procedure based on lumped-element models for resonator building blocks.

Main Results:

• A modular approach combining lossy filter synthesis with transmission-matrix descriptions for SAW components was established.
• The range of validity for the lumped-element model approximation was examined.
• Software for simulating SAW grating devices was developed and demonstrated with a resonator filter design example.

Conclusions:

• The described matrix approach provides a systematic and modular method for designing SAW grating filters.
• The developed software, integrated into a CAD/CAA package, facilitates efficient analysis and design of SAW filters.
• This methodology enables accurate performance prediction and design optimization for SAW devices, considering signal losses.