Apparatus and method for phase-encoded surface wave devices
US3931597A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1974 |
| Grant date | Jan 6, 1976 |
| Priority date | — |
| Expiry date | Feb 4, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/14535
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Apparatus and method for phase-encoding electro-acoustic electro-acoustic elements, elements of an acoustic surface wave device to provide preselected transducer characteristics. By altering the position of a transducer element or portions of a transducer element, the phase of the acoustic wave propagated from, or the phase of the electrical signal received by the transducer element can be varied by an amount determined by the velocity of propagation of the acoustic wave. By altering the location of the electro-elements, or portions thereof, from a position determined for example by amplitude-encoding techniques, a resultant signal produced by a plurality of electro-acoustic elements, element portions, or combination of elements and element portions can provide the preselected transducer characteristics. In addition, the elements or element portions can be located such that the overlap amplitude between adjacent electro-acoustic elements is substantially a constant, providing increased directionality for acoustic waves orignating at the transducer. According to one embodiment, each electro-acoustic transducer can be phase-encoded permitting both an input and an output transducer to…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.