Surface acoustic wave transducer
US7135805B2 · kind B2 · utility
Assignees
Inventor
Key dates
| Filing date | Apr 7, 2004 |
| Grant date | Nov 14, 2006 |
| Priority date | — |
| Expiry date | Jun 10, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/14538
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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 λ0 represents a wavelength corresponding to a fundamental operating frequency of the unidirectional surface acoustic wave transducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.