Surface acoustic wave transducer

Details Surface acoustic wave transducer Surface acoustic wave transducer

2006-11-14

2006-11-14

Budd, Mark (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S31300R

Reexamination Certificate

active

07135805

ABSTRACT:
A unidirectional surface acoustic wave (SAW) transducer has a substrate which is piezoelectric or electrostrictive, a first IDT (interdigital transducer) electrode disposed on a surface of the substrate and having a plurality of first electrode fingers, and a second IDT electrode disposed on the surface of the substrate and having a plurality of second electrode fingers alternating with the first electrode fingers, and structural elements disposed on the surface of the substrate and arranged periodically in a propagating direction of surface acoustic waves. The structural elements comprise grooves or dielectric films each having a width of λ0/4 or λ0/2, for example, where λ0represents a wavelength corresponding to a fundamental operating frequency of the unidirectional surface acoustic wave transducer.

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C.S. Hartmann et al. “An Analysis of Saw Interdigital Transducers with Internal Reflections and the Application to the Design of Single-Phase Unidirectional Transducers” Proceedings of 1982 Ultrasonic Symposium, pp. 40-45, 1982.

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