Shallow bulk acoustic wave devices
US4349794A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1978 |
| Grant date | Sep 14, 1982 |
| Priority date | — |
| Expiry date | Oct 24, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/02716
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Acoustic wave devices employing shallow bulk acoustic waves rather than surface acoustic waves, to provide higher frequencies of operation and other significant advantages, such as less susceptibility to aging and less sensitivity to surface contamination. In each embodiment of the invention, a transmitting transducer and a receiving transducer are oriented on the surface of an anisotropic piezoelectric crystal to achieve substantial coupling of shallow bulk acoustic waves and essentially zero coupling of surface acoustic waves. In one embodiment of the invention, various types of grating filters utilize shallow bulk acoustic waves, and a set of parallel mechanical or electrical discontinuities at or near the surface of the crystal provide reflection of acoustic energy at a frequency determined by the spacing of the discontinuities. Uniformly spaced gratings provide bandpass filter operation, and gratings with graduated spacings provide for frequency compression or expansion. In another embodiment of the invention, variations in device characteristics due to temperature changes are compensated for by directing the shallow bulk waves through materials having favorable or opposite te…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.