Acoustic wave electromechanical device comprising a transduction region and an extended cavity
US9059677B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2012 |
| Grant date | Jun 16, 2015 |
| Priority date | — |
| Expiry date | May 8, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2009/02165
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An electromechanical device having a resonator using acoustic waves propagating laterally within a piezoelectric plane resonant structure and electrodes on a face of said structure. The resonant structure comprises: a transduction region having a transduction length and generating acoustic waves; a free propagation region for the acoustic waves, adjacent to the transduction region and defined the plane of the transduction region; the resonant structure length being equal to an integer number of half-wavelengths, the resonance frequency of said resonator equaling the average propagation velocity of the wave within the structure divided by said wavelength, to adjust the quality factor of the resonator fixed by the length of the resonant structure and the coupling coefficient fixed by the ratio of the transduction length over the length of the resonant structure; the resonant structure defined by the assembly of the transduction region and the propagation region being laterally bounded by reflection regions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.