Title:
ACOUSTIC WAVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/177340
Kind Code:
A1
Abstract:
The present invention reduces Rayleigh mode spurious responses generated in a lower frequency band than an excitation mode used to obtain characteristics, and reduces higher mode spurious responses generated in a higher frequency band than the excitation mode. An acoustic wave device (1) is provided with a support substrate (2), a first piezoelectric layer (3A) and a second piezoelectric layer (3B), and an IDT electrode (6). The first piezoelectric layer (3A) and the second piezoelectric layer (3B) are provided to the support substrate (2). The IDT electrode (6) is provided to the first piezoelectric layer (3A), and comprises a plurality of electrode fingers (63). The second piezoelectric layer (3B) is provided between the first piezoelectric layer (3A) and the support substrate (2). The first piezoelectric layer (3A) and the second piezoelectric layer (3B) are lithium tantalate or lithium niobate. The Euler angles of the second piezoelectric layer (3B) are different than the Euler angles of the first piezoelectric layer (3A).
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Inventors:
IWAMOTO HIDEKI
Application Number:
PCT/JP2021/008116
Publication Date:
September 10, 2021
Filing Date:
March 03, 2021
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/25
Domestic Patent References:
| WO2017043427A1 | 2017-03-16 | |||
| WO2012086639A1 | 2012-06-28 | |||
| WO2013031651A1 | 2013-03-07 |
Foreign References:
| JP2002009584A | 2002-01-11 |
Attorney, Agent or Firm:
HOKUTO PATENT ATTORNEYS OFFICE (JP)
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