Surface acoustic wave (saw) filter of the reactance filter type exhibiting improved stop band suppression and method for optimizing the stop band suppression
US6747530B1 · kind B1 · utility
23Cited by
9References
8Claims
0Family size
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Key dates
| Filing date | Jan 10, 2002 |
| Grant date | Jun 8, 2004 |
| Priority date | — |
| Expiry date | Feb 1, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/6483
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a SAW filter of the reactance type having at least two SAW resonators in two parallel branches and a SAW resonator in a serial branch, the invention provides that an electrical connection fashioned on the substrate of the ground sides of the two SAW resonators in the parallel branches is done before the bonding to the housing in order to achieve a shift of the pole point belonging to the parallel branch to a lower frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.