Title:
ELASTIC WAVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2024/085127
Kind Code:
A1
Abstract:
The present invention provides an elastic wave device that makes it possible to reduce the size of a filter device and to improve power handling properties. An elastic wave device 10 according to the present invention comprises a first elastic wave resonator 10A and a second elastic wave resonator 10B. The first elastic wave resonator 10A and the second elastic wave resonator 10B each comprise: a piezoelectric film which includes a piezoelectric layer 14 that comprises lithium niobate; a first comb-shaped electrode (first, fourth comb-shaped electrodes) which is provided on the piezoelectric layer 14, which is connected to an input potential, and which has a first bus bar (first, fourth bus bars 22, 32) and a plurality of first electrode fingers (plurality of first, fourth electrode fingers 25, 35) that are respectively connected to one end of the first bus bar; a second comb-shaped electrode (second, fifth comb-shaped electrodes) which is provided on the piezoelectric layer 14, which is connected to an output potential, and which has a second bus bar (second, fifth bus bars 23, 33) and a plurality of second electrode fingers (plurality of second, fifth electrode fingers 26, 36) that are respectively connected to one end of the second bus bar and that are interpolated in the plurality of first electrode fingers (plurality of first, fourth electrode fingers 25, 35); and a third electrode which is connected to a reference potential and which has a plurality of third electrode fingers (plurality of third, sixth electrode fingers 27, 37) that are respectively provided on the piezoelectric layer 14 so as to be side by side with the first electrode fingers and the second electrode fingers along the direction in which the first electrode fingers and the second electrode fingers are arranged in a plan view, and a connection electrode (third, sixth bus bars 24, 34) that connects adjacent third electrode fingers to each other. In each of the first elastic wave resonator 10A and the second elastic wave resonator 10B, the order in which the first electrode fingers, the second electrode fingers, and the third electrode fingers are arranged in a plan view is such that, starting from a first electrode finger, one cycle is constituted by a first electrode finger, a third electrode finger, a second electrode finger, and a third electrode finger. The first elastic wave resonator 10A and the second elastic wave resonator 10B are each a divided resonator in which one elastic wave resonator is divided in series.
Inventors:
DAIMON KATSUYA (JP)
NAGATOMO SHO (JP)
NAGATOMO SHO (JP)
Application Number:
PCT/JP2023/037479
Publication Date:
April 25, 2024
Filing Date:
October 17, 2023
Export Citation:
Assignee:
MURATA MFG CO LTD (JP)
International Classes:
H03H9/145
Attorney, Agent or Firm:
OSAKA FRONT (JP)
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