Elastic bulk wave frequency filter
US4074213A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1976 |
| Grant date | Feb 14, 1978 |
| Priority date | — |
| Expiry date | Nov 30, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/46
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A high frequency elastic bulk wave filter, using the variation as a function of frequency of the direction in which a bulk wave travelling through an elastic body is diffracted by a flat surface of that body, formed with a grating. The bulk wave beam corresponding to the signal to be filtered, impinges under normal incidence on the grating, the profile of which is designed to minimize the amount of energy contained in the non-dispersive beam specularly reflected by the grating. The filter further comprises a transducer to collect the diffracted wave, applied to an inclined surface, which is parallel to the wave plane of the diffracted wave.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.