Compensation techniques for temperature effects and non-uniform amplitude distributions in saw devices
US4661738A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 1985 |
| Grant date | Apr 28, 1987 |
| Priority date | — |
| Expiry date | Sep 26, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/02795
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A SAW device using a first reflector (13) and a second reflector (14) is arranged to provide compensation for temperature effects. The temperature effects are due to the anisotropic characteristics of piezoelectric material commonly used as the substrate and wave medium for the acoustic waves in the SAW devices. These materials typically exhibit a temperature dependent, preferential direction of transmission which if not compensated results in a temperature dependent signal attenuation. An additional technique using a non-reflective portion 22 offsets non-uniformity which occurs in the amplitude distribution of the reflected acoustic wave. Each reflector (13 and 14) may include its respective non-reflective portion (A.sub.1 and A.sub.2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.