Title:
ELASTIC WAVE DEVICE AND FILTER DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/002858
Kind Code:
A1
Abstract:
Provided is an elastic wave device capable of suppressing unwanted waves and also suppressing an increase in insertion loss. An elastic wave device 10 of the present invention is provided with: a support member including a support substrate; a piezoelectric layer 14 provided on the support member and comprising a rotated Y-cut lithium niobate layer; and an IDT electrode 11 provided on the piezoelectric layer 14 and including a pair of bus bars (first and second bus bars 26, 27) and a plurality of electrode fingers (a plurality of first and second electrode fingers 28, 29). The support member is provided with an acoustic reflecting portion. The acoustic reflecting portion overlaps at least a part of the IDT electrode 11 in plan view. If the thickness of the piezoelectric layer 14 is d and the distance between the centers of adjacent electrode fingers is p, d/p ≤ 0.5. Some of the plurality of electrode fingers are connected to one of the bus bars of the IDT electrode 11, and the remaining electrode fingers of the plurality of electrode fingers are connected to the other bus bar. A plurality of electrode fingers connected to the one bus bar and a plurality of electrode fingers connected to the other bus bar are interdigitated with each other. When viewed from a direction in which adjacent electrode fingers oppose each other, the adjacent electrode fingers overlap each other in an intersecting region F. A pair of gap regions (first and second gap regions G1, G2) are positioned between the intersecting region F and the pair of bus bars. A mass-adding film 24 is provided in at least a part of at least one of the pair of gap regions.
Inventors:
DAIMON KATSUYA (JP)
Application Number:
PCT/JP2022/026998
Publication Date:
January 26, 2023
Filing Date:
July 07, 2022
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145; H03H9/25; H03H9/64
Domestic Patent References:
| WO2021039639A1 | 2021-03-04 | |||
| WO2021060523A1 | 2021-04-01 | |||
| WO2019139076A1 | 2019-07-18 | |||
| WO2020262388A1 | 2020-12-30 |
Foreign References:
| JP2019080093A | 2019-05-23 | |||
| JP2000165197A | 2000-06-16 | |||
| JP2017112603A | 2017-06-22 |
Attorney, Agent or Firm:
OSAKA FRONT (JP)
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