Reflective array modeling for reflective and directional SAW transducers

• Published in: IEEE transactions on ultrasonics, ferroelectrics, and frequency control Vol. 45; no. 1; pp. 152 - 157
• Main Author: Morgan, D.P.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-01-1998; Institute of Electrical and Electronics Engineers
• Subjects: Acoustic reflection; Acoustic wave devices, piezoelectric and piezoresistive devices; Applied sciences; Bandwidth; Diffraction; Electrodes; Electronics; Electrostatics; Exact sciences and technology; Finite element methods; Frequency; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Surface acoustic wave devices; Surface acoustic waves; Transducers; Acoustic wave device; Theoretical study; Surface wave; Mode coupling; Wave reflection; Interdigital transducer
• ISSN: 0885-3010; 1525-8955
• DOI: 10.1109/58.646919

This paper presents a new approximate method for analyzing reflective SAW transducers, with much of the convenience of the coupled-mode (COM) method but with better accuracy. Transduction accuracy is obtained by incorporating the accurate electrostatic solution, giving for example correct harmonics, and allowance for electrode width variation, in a simple manner. Results are shown for a single-electrode transducer, Natural SPUDT and DART SPUDT, each using theoretically derived parameters. In contrast to the COM, the RAM can give accurate results for short or withdrawal-weighted transducers and for wide analysis bandwidth.