Surface acoustic wave filter
US6940368B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2002 |
| Grant date | Sep 6, 2005 |
| Priority date | — |
| Expiry date | Apr 8, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/14588
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention relates to a surface acoustic wave filter (or SAW filter) comprising a symmetrical network with differential inputs/outputs, in particular for mobile telecommunication systems. A network of the ladder or balanced bridge type comprises at least one structure of the surface acoustic wave resonator type, that comprises at least two transducers in the same acoustic channel, two of said transducers being substantially identical, connected to two symmetrical branches of the network and arranged in such a way that the acoustic waves generated by the two transducers are in phase. Advantageously, arrays of reflectors are placed on either side of the structure. Apart from saving space, this structure makes it possible in particular to simplify the production of the filter and to achieve better control in balancing the branches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.