Method and apparatus for acoustic wave inductance
US5287036A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 2, 1992 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Mar 2, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/02629
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An inductive element for impedance matching comprises an acoustic wave propagating substrate and an acoustic wave transducer coupled to the acoustic wave propagating substrate. The acoustic wave transducer has an effective length L.sub.eff such that Le.sub.eff .gtoreq.C.sub.2 v.sub.a /f.sub.o k.sup.2, where C.sub.2 is a numerical factor such that C.sub.2 .gtoreq.2, v.sub.a represents an acoustic velocity, f.sub.o represents an acoustic wave transducer center frequency and k.sup.2 denotes an acoustic wave propagating substrate electromechanical coupling coefficient. Reflecting elements are provided on the substrate in the principal acoustic propagation directions to form a resonant acoustic cavity. The device exhibits inductive impedance and high Q over a significant frequency range in small physical size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.