Surface acoustic wave filters
US6246148A · kind A · utility
15Cited by
13References
8Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | May 14, 1999 |
| Grant date | Jun 12, 2001 |
| Priority date | — |
| Expiry date | May 14, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2250/00
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Filter structures are described consisting of a plurality of individual surface acoustic wave (SAW) resonators formed of inter-digitated metallic combs on a common piezoelectric substrate. Areas of metallisation (1, 2, 3, 4) between the combs provide means to connect the filter in a circuit, e.g. in a mobile telephone unit to act as a filter with a passband in the 800 to 2200 MHz range. The individual SAW resonators differ from one another and are interconnected in ladder and/or balanced bridge arrangements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.