Band rejection filter
US8773221B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 2010 |
| Grant date | Jul 8, 2014 |
| Priority date | — |
| Expiry date | Feb 7, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2007/013
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An inexpensive compact band rejection filter realizes a high sharpness of a filter characteristic at ends of passbands and has a large attenuation. In the band rejection filter, at least one of a plurality of elastic wave resonators, which contributes to formation of a transition band, has a propagation angle larger than those of the other elastic wave resonators. Accordingly, the at least one of the plurality of elastic wave resonators which contributes to the formation of the transition band has an electromechanical coupling coefficient that is smaller than electromechanical coupling coefficients of the other elastic wave resonators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.