Surface acoustic wave delay line with bulk wave discrimination
US3967221A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1974 |
| Grant date | Jun 29, 1976 |
| Priority date | — |
| Expiry date | Jan 24, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/42
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The disclosure relates to an acoustic surface wave device and method for long signal delays and bulk wave discrimination through the folding of a surface wave propagation path. A surface wave device is formed on the surface of an acoustic substrate and a surface wave, acoustic discontinuity is formed in the propagation path of surface waves propagated along the surface of the substrate. The acoustic discontinuity defines a reflecting surface for acoustic surface waves thereby deflecting incident surface waves along a reflecting path differing from the propagation path. Substantially all of the bulk waves propagated along the propagation path continue along this path and can be absorbed or otherwise dissipated. As a result, a substantially pure surface wave mode signal can be detected along the reflecting path. The surface waves may be reflected in this manner, i.e., by folding the path of the surface waves, a number of times as required to obtain a desired delay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.