Surface elastic wave filter
US4096456A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1976 |
| Grant date | Jun 20, 1978 |
| Priority date | — |
| Expiry date | Dec 21, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/02897
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A surface elastic wave filter in which Rayleigh waves experience only small attenuation and phase-shift, the number of radiating elements encountered by the surface wave during the wave propagation having a direction parallel to an axis xx through the filter, being restricted. The filter comprises at least one electromechanical transducer constituted by two metallic comb structures A and B whose teeth d.sub.A1, d.sub.A2, d.sub.A3 and d.sub.B1, d.sub.B2, d.sub.B3 are interdigitated and are arranged at either side of an axis yy in symmetrical fashion vis-a-vis a point M located upon said axis, at the center of the transducer. The filter can be used to the filtering of video-frequency signals in television circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.