Acoustic wave filter device
US8456254B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 2009 |
| Grant date | Jun 4, 2013 |
| Priority date | — |
| Expiry date | Mar 4, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/6483
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An acoustic wave filter device includes plural filter circuits between an input terminal and an output terminal. Plural inductors are connected in series in a series arm that connects the input terminal and the output terminal, and plural first acoustic wave resonators are connected between the series arm and a ground potential. Each of the filter circuits includes at least one of the inductors and one of the first acoustic wave resonators. A second acoustic wave resonator in the series arm connects adjacent filter circuits. The acoustic wave filter device has a pass band lower than a trap band, steep attenuation characteristics in a range from the pass band to the trap band, and is capable of providing a large amount of attenuation in the trap band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.