Solidly-mounted transversely excited film bulk acoustic resonator using rotated Y-X cut lithium niobate
US11146244B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 2020 |
| Grant date | Oct 12, 2021 |
| Priority date | — |
| Expiry date | Aug 11, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10N30/877
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Acoustic resonator devices, filters, and methods are disclosed. An acoustic resonator device includes a substrate, a single-crystal lithium niobate plate, an acoustic Bragg reflector sandwiched between a surface of the substrate and a back surface of the lithium niobate plate, wherein the acoustic Bragg reflector includes a plurality of layers alternating between high acoustic impedance layers and low acoustic impedance layers, wherein all of the plurality of layers are dielectric materials, and wherein the high acoustic impedance layers are one of silicon nitride and aluminum nitride and the low acoustic impedance layers are carbon-containing silicon oxide, and an interdigital transducer (IDT) formed on a front surface of the lithium niobate plate. Euler angles of the lithium niobate plate are [0°, β, 0°], where β is greater than or equal to 0° and less than or equal to 60°.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.