Elastic surface wave filter
US4257021A · kind A · utility
1Cited by
2References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1979 |
| Grant date | Mar 17, 1981 |
| Priority date | — |
| Expiry date | Jun 6, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/14591
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An elastic surface wave filter including on the surface of a plate, an emitting transducer, a surface wave coupler, and means for receiving the waves radiated by the coupler. The means for receiving includes two transducers each having two terminals with one terminal of each being in common with one terminal of the other. The common terminal serves as a phase reference and the voltages induced at the remaining terminals are in phase opposition to one another in the transmission band of the filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.