Surface acoustic wave device having polycrystalline piezoelectric ceramic layers
US6208063A · kind A · utility
57Cited by
9References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1999 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | Nov 3, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/02574
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A surface acoustic wave device includes a piezoelectric substrate, and an interdigital transducer provided on the piezoelectric substrate, wherein the piezoelectric substrate includes at least two piezoelectric ceramic layers made of a polycrystalline material. The at least two piezoelectric ceramic layers are stacked so that electrical characteristics and mechanical characteristics thereof vary in a direction that is substantially perpendicular a surface of the piezoelectric substrate upon which the at least two ceramic piezoelectric layers are stacked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.