Filter using lithium niobate and rotated lithium tantalate transversely-excited film bulk acoustic resonators
US11996825B2 · kind B2 · utility
1Cited by
39References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 24, 2020 |
| Grant date | May 28, 2024 |
| Priority date | — |
| Expiry date | Oct 27, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2003/023
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Acoustic filters are disclosed. A bandpass filter has a passband between a lower band edge and an upper band edge. The bandpass filter includes a plurality of transversely-excited film bulk acoustic resonators (XBARs) connected in a ladder filter circuit. The plurality of XBARs includes at least one lithium tantalate (LT) XBAR and at least one lithium niobate XBAR. Each of the at least one LT XBAR includes an LT piezoelectric plate with Euler angles (0°, β, 0°), where β is greater than zero and less than or equal to 40 degrees.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.