Title:
ELASTIC WAVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/200835
Kind Code:
A1
Abstract:
Provided is an elastic wave device which can increase a Q value and is less likely to be deteriorated in resonance characteristics even when the size is reduced. The elastic wave device 1 according to the present invention is provided with: a piezoelectric film 2 which comprises lithium niobate or lithium tantalate; first and second bus bar electrodes 6, 7 which are arranged on the piezoelectric film 2 and face each other; and first and second electrode fingers 8, 9 in which one terminal of the first electrode finger 8 is connected to the first bus bar electrodes 6 and one terminal of the second electrode finger 9 is connected to the second bus bar electrodes 7. The elastic wave device 1 utilizes bulk waves in a thickness shear primary mode. A first gap G1 is arranged between the first bus bar electrode 6 and the second electrode finger 9. A second gap G2 is arranged between the second bus bar electrode 7 and the first electrode finger 8. When the distance between the centers of the adjacent first and second electrode fingers 8, 9 is defined as "p", the length of each of the first and second gaps G1, G2 along the direction on which the first and second electrode fingers 8, 9 extend is 0.92p or more.
Inventors:
OUCHI MINEFUMI (JP)
Application Number:
PCT/JP2021/013328
Publication Date:
October 07, 2021
Filing Date:
March 29, 2021
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145; H03H9/25
Domestic Patent References:
| WO2018003282A1 | 2018-01-04 | |||
| WO2019111664A1 | 2019-06-13 |
Foreign References:
| JP2010233210A | 2010-10-14 | |||
| JP2013528996A | 2013-07-11 | |||
| JP2013115496A | 2013-06-10 | |||
| JP2018074575A | 2018-05-10 |
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (JP)
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