Boundary acoustic wave device
US7772742B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 2008 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Feb 25, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/02834
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A boundary acoustic wave device includes a first medium, a second medium, a third medium, and a fourth medium that are laminated in that order and, an electrode including an IDT electrode disposed at an interface between the first medium and the second medium, the temperature coefficient of delay time TCD of a boundary acoustic wave has a positive value, the fourth medium or the second medium has a positive temperature coefficient of sound velocity TCV, the first medium has a negative temperature coefficient of sound velocity TCV, and the sound velocity of transverse wave of the third medium is set to be less than the sound velocity of transverse wave of the fourth medium and/or the second medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.