Interface acoustic wave device made of lithium tantalate
US7126251B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2003 |
| Grant date | Oct 24, 2006 |
| Priority date | — |
| Expiry date | Jun 19, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/0222
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention relates to interfaces acoutics wave components made of lithium tantalate. Two substrate make up the filter have the same cut and the same crystal orientation, the invention gives the best cut angles in particular for optimizing the electromechanical coupling coefficient that determines the final performance characteristics of the component produced. Curves giving the variations of the coupling coefficient an the attenuation as a function of the cut angles and of the direction of propagation are provided. The values of the main acoustic characteristics of the component for these optimum cut angles are also given. The application of this type of device are, on the on hand, uses as a passive component such a resonator or a filter or a delay line, or as an integrated device, either in a measurement chain or in any array of devices operating according to the principle of recognition of the device by a phase code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.