Elastic wave filter device
US9712139B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2015 |
| Grant date | Jul 18, 2017 |
| Priority date | — |
| Expiry date | Nov 6, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/6433
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An elastic wave filter device includes serial and parallel arms and a plurality of elastic wave resonators. Each elastic wave resonator includes an IDT electrode. In the case where a direction in which electrode fingers extend is taken as a width direction of the IDT electrode, the IDT electrode includes a central area at a center in the width direction, a low acoustic velocity area at an outer side portion of the central area, and a high velocity area at a farther outer side portion thereof. A width of the low acoustic velocity area of at least one elastic wave resonator differs from a width of the low acoustic velocity area of the other elastic wave resonators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.