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US 12,744,513 B2Granted
Acoustic wave device having stacked piezoelectric layers between electrodes
AssigneeSkyworks Global Pte. Ltd.
InventorsJiansong Liu, Kwang Jae Shin, Li Chen, Chun Sing Lam
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Abstract
Aspects of this disclosure relate to acoustic wave devices that include a plurality of stacked piezoelectric layers positioned between electrodes. Such acoustic wave devices can excite an overtone mode as a main mode. Related acoustic wave filters, radio frequency modules, wireless communication devices, and methods are also disclosed.
Claims20
An acoustic wave device with multiple piezoelectric layers, the acoustic wave device comprising:
- a first electrode;
- a second electrode;
- and
- a plurality of piezoelectric layers stacked with each other and positioned between the first electrode and the second electrode, the plurality of piezoelectric layers including a first piezoelectric layer and a second piezoelectric layer, the first piezoelectric layer having a first c-axis and the second piezoelectric layer having a second c-axis, the first c-axis being oriented in a different direction than the second c-axis, the plurality of piezoelectric layers together with the first and second electrodes configured to excite an overtone mode as a main mode of the acoustic wave device, and a resonant frequency of the overtone mode is in a range from 5 gigahertz to 12 gigahertz.
1 more element
An acoustic wave device with multiple piezoelectric layers, the acoustic wave device comprising:
- a first electrode;
- a second electrode, the first electrode and the second electrode being the only electrodes of the acoustic wave device;
- and
- a plurality of piezoelectric layers stacked with each other and positioned between the first electrode and the second electrode, the plurality of piezoelectric layers including a first piezoelectric layer and a second piezoelectric layer, the plurality of piezoelectric layers together with the first and second electrodes configured to excite an overtone mode as a main mode of the acoustic wave device, and a resonant frequency of the overtone mode is in a range from 5 gigahertz to 12 gigahertz.
1 more element
An acoustic wave filter comprising:
- an acoustic wave device that includes a first electrode, a second electrode, and a plurality of piezoelectric layers stacked with each other and positioned between the first electrode and the second electrode, the first electrode and the second electrode being the only electrodes of the acoustic wave device, the plurality of piezoelectric layers including a first piezoelectric layer and a second piezoelectric layer, the acoustic wave device configured to excite an overtone mode as a main mode, and a resonant frequency of the overtone mode is in a range from 5 gigahertz to 12 gigahertz;
- and
- a plurality of additional acoustic wave devices, the acoustic wave device and the plurality of additional acoustic wave devices together configured to filter a radio frequency signal.
Dependencies are inferred from the claim text.