Surface acoustic wave filter with a ground pattern partially surrounding a signal pad and communication device using same
US6943649B2 · kind B2 · utility
4Cited by
1References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 29, 2003 |
| Grant date | Sep 13, 2005 |
| Priority date | — |
| Expiry date | Aug 29, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2224/16225
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A surface acoustic wave filter includes multiple serial surface acoustic wave resonators and parallel surface acoustic wave resonators arranged in a ladder configuration between an input electrode pad and an output electrode pad on a piezoelectric substrate, and a grounded electrode pattern is arranged on the piezoelectric substrate so as to surround at least one of the input electrode pad and the output electrode pad. This provides a small-sized surface acoustic wave filter with improved attenuation near the pass band on the high-frequency side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.