Surface elastic wave filter with resonant cavities
US11962288B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 2022 |
| Grant date | Apr 16, 2024 |
| Priority date | — |
| Expiry date | Sep 15, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/02574
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A surface elastic wave filter has resonant cavities and comprises a composite substrate formed of a base substrate and a piezoelectric upper layer; at least one input electroacoustic transducer and an output electroacoustic transducer, arranged on the upper layer, and at least one internal reflecting structure, arranged between the input electroacoustic transducer and the output electroacoustic transducer. The internal reflecting structure comprises a first structure comprising at least one reflection grating having a first period and a second structure comprising at least one reflection grating having a second period, the first period being greater than the second period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.