Filter device including longitudinally coupled resonator elastic wave filter and elastic wave resonator
US10469055B2 · kind B2 · utility
2Cited by
2References
20Claims
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Key dates
| Filing date | Dec 4, 2017 |
| Grant date | Nov 5, 2019 |
| Priority date | — |
| Expiry date | Jan 2, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/725
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A filter device includes a longitudinally coupled resonator elastic wave filter that includes IDT electrodes including low acoustic velocity regions in outer side portions of center regions of the IDT electrodes and high acoustic velocity regions in outer side portions of the low acoustic velocity regions in a direction orthogonal or substantially orthogonal to an elastic wave propagation direction, and defines and functions as a first bandpass filter, and elastic wave resonators that are electrically connected to the longitudinally coupled resonator elastic wave filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.