Boundary acoustic wave filter
US7310027B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 2006 |
| Grant date | Dec 18, 2007 |
| Priority date | — |
| Expiry date | Oct 4, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/0222
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A boundary acoustic wave filter includes a first medium layer, a second medium layer laminated on the first medium layer, and IDT electrodes that are disposed at the boundary between the first and second medium layers and that define an electroacoustic transducer. In the boundary acoustic wave filter, the sound velocity of boundary acoustic waves, which is the product of the wavelength determined by the period of the electrodes and the frequency at least the lower end of the stopband disposed at the high-frequency side of the passband, is less than the sound velocity of slow transverse waves propagating through the first medium layer and the second medium layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.