Acoustic wave filter with reduced bulk-wave scattering loss and method
US5434466A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 1994 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | May 31, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/6483
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An acoustic wave filter with reduced bulk-wave scattering loss has a center frequency and an associated acoustic wavelength. The filter includes a substrate and a first reflector having a first group of periodically disposed reflective elements. The filter includes a first transducer on a first side of the first reflector. The filter also includes a first gap having a first width, located between the first reflector and the first transducer. The first width exceeds one-fourth of the acoustic wavelength. The filter includes a second reflector and a second gap disposed between the first transducer and the second reflector. The second gap has a second breadth exceeding one-fourth of the acoustic wavelength. A first waveguiding element is positioned within the first gap and having a first breadth. The first width exceeds the first breadth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.