Electric/acoustic transducers and acoustic/electric transducers for a surface wave device with reduced diffraction and a corresponding surface wave device
US5084646A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1990 |
| Grant date | Jan 28, 1992 |
| Priority date | — |
| Expiry date | Mar 22, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2240/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention concerns electric/acoustic input transducers and acoustic/electric output transducers, in particular for a surface wave device, of the type comprising on a large face of a planar piezoelectric substrate: (i) two conductive input zones or output zones separated by a substrate band over which there extend respective parallel fingers which are interlaced according to a pattern chosen to form a row of fingers along this band, the general direction of the band being inclined to the direction of the fingers; and (ii) electric input means for applying high frequency signals between the zones so as to form sources of surface acoustic waves on the substrate or output means for extracting the signals detected by the device. At least one of the two conductive input or output zones is subdivided into electrically separated sub-zones, while the electric input means comprise a distributor capable of separately energizing the conductive input zones and while the electric output means comprise a coupler capable of combining the electric signals coming from said output sub-zones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.