Surface acoustic wave apparatus using filters with overlapped propagation paths and communications unit
US6693501B2 · kind B2 · utility
9Cited by
5References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2002 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | May 11, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/02866
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a surface acoustic wave (SAW) apparatus, a first SAW filter device and a second SAW filter device are disposed on a piezoelectric substrate such that their respective propagation paths overlap. When the center-to-center distance between the first and second SAW filter devices are indicated by d1, and when the thickness of the piezoelectric substrate is indicated by t, the first and second SAW filter devices and the piezoelectric substrate are arranged so as to satisfy the condition d1≦2.3×t or d1≧2.8×t.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.