Conjugately matched acoustic wave transducers and method
US5334960A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 16, 1993 |
| Grant date | Aug 2, 1994 |
| Priority date | — |
| Expiry date | Feb 16, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/14597
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A filter device comprises an acoustic wave propagating substrate having an effective coupling coefficient k.sup.2 and having a first filter and a second filter disposed on the acoustic wave propagating substrate. The first filter comprises a first electro-acoustic transducer and a first acousto-electric transducer, both disposed on the acoustic wave propagating substrate. The first acousto-electric transducer comprises N.sub.1 many electrode pairs, wherein N.sub.1 .gtoreq.C/k.sup.2. C is a constant having a value in the range from 1 to 2. The first acousto-electric transducer is acoustically coupled to the first electro-acoustic transducer. The second filter comprises a second electro-acoustic transducer and a second acousto-electric transducer, both disposed on the acoustic wave propagating substrate. The second electro-acoustic transducer is electrically coupled to the first acousto-electric transducer. The second electro-acoustic transducer comprises N.sub.2 many electrode pairs, wherein N.sub.2 <C/k.sup.2. The second acousto-electric transducer is acoustically coupled to the second electro-acoustic transducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.