Title:
ACOUSTIC WAVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/065666
Kind Code:
A1
Abstract:
The present invention further enhances resistance to electric power while suppressing deterioration of frequency characteristics. A first IDT electrode (7A) and a second IDT electrode (7B) are connected in series to each other via a common bus bar (70) shared by these electrodes. In each of a first acoustic impedance layer (4A) and a second acoustic impedance layer (4B), at least one high-acoustic impedance layer (41) and at least one low-acoustic impedance layer are conductive layers. At least a portion of the conductive layers of the first acoustic impedance layer (4A) and at least a portion of the conductive layers of the second acoustic impedance layer (4B) do not overlap with the common bus bar (70) in a plan view from the thickness direction of a piezoelectric layer (5). The conductive layers of the first acoustic impedance layer (4A) are electrically insulated from the conductive layers of the second acoustic impedance layer (4B).
Inventors:
OMURA MASASHI
Application Number:
PCT/JP2018/035552
Publication Date:
April 04, 2019
Filing Date:
September 26, 2018
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/25; H01L41/047; H01L41/08; H01L41/09; H03H9/145; H03H9/64
Domestic Patent References:
| WO2016147986A1 | 2016-09-22 | |||
| WO2016063718A1 | 2016-04-28 | |||
| WO2016052129A1 | 2016-04-07 | |||
| WO2016208427A1 | 2016-12-29 |
Attorney, Agent or Firm:
HOKUTO PATENT ATTORNEYS OFFICE (JP)
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