Acoustic wave resonator, filter, and multiplexer
US11569433B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2018 |
| Grant date | Jan 31, 2023 |
| Priority date | — |
| Expiry date | Dec 2, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/87
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An acoustic wave resonator includes: a piezoelectric substrate; and an interdigital transducer (IDT) located on the piezoelectric substrate, the IDT including a pair of comb-shaped electrodes having a plurality of electrode fingers and a bus bar to which the plurality of electrode fingers are coupled, the IDT having: a first region in which a pitch of electrode fingers is substantially constant; a second region in which a pitch of electrode fingers decreases at closer distances to an outer side; and a third region in which a pitch of electrode fingers increases at closer distances to an outer side, the second region being located outside the first region in an arrangement direction of the plurality of electrode fingers, and the third region being located outside the second region in the arrangement direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.