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Patent Searching and Data


Title:
ELASTIC WAVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2021/065684
Kind Code:
A1
Abstract:
Provided is an elastic wave device that can more effectively suppress a transverse mode. This elastic wave device 1 is provided: with a high-acoustic-velocity film 14; a low-acoustic-velocity film 15; a piezoelectric layer 16 formed from lithium tantalate; and an IDT electrode 3 disposed on the piezoelectric layer 16. The IDT electrode 3 includes a first and a second busbar 4, 5 and a plurality of first and second electrode fingers 6, 7. A portion where the first and second electrode fingers 6, 7 overlap in the direction of propagation of elastic waves is a crossover region A. The crossover region A includes a central region B and a first and a second edge region C1, C2. The IDT electrode 3 includes a first and a second gap region D1, D2 located on the outer sides of the first and second edge regions C1, C2. The width of the first and second electrode fingers 6, 7 in the first and second edge regions C1, C2 is greater than in the central region B. The duty ratio in the first and second edge regions C1, C2 is 0.62-0.73.

Inventors:
DAIMON KATSUYA (JP)
Application Number:
PCT/JP2020/036099
Publication Date:
April 08, 2021
Filing Date:
September 24, 2020
Export Citation:
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Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H03H9/145
Domestic Patent References:
WO2019177028A12019-09-19
WO2016170982A12016-10-27
WO2018097016A12018-05-31
Foreign References:
JP2019091978A2019-06-13
JP2019097155A2019-06-20
Attorney, Agent or Firm:
MIYAZAKI & METSUGI (JP)
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