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Title:
ACOUSTIC WAVE DEVICE, DEMULTIPLEXER AND COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/009246
Kind Code:
A1
Abstract:
This acoustic wave device comprises: a substrate; a multilayer film that is positioned on the substrate; an LT layer that is positioned on the multilayer film, while being configured from a single crystal of LiTaO3; and an IDT electrode that is positioned on the LT layer. The thickness of the LT layer is 0.3 λ or less when λ is the value equal to twice the pitch p of the electrode fingers of the IDT electrode. The Euler angles of the LT layer are (0° ± 20°, from -5° to 65° (inclusive), 0° ± 10°), (-120° ± 20°, from -5° to 65° (inclusive), 0° ± 10°) or (120° ± 20°, from -5° to 65° (inclusive), 0° ± 10°). The multilayer film 5 is configured by alternately laminating first layers and second layers. The first layers are formed from SiO2. The second layers are formed from any one of Ta2O5, HfO2, ZrO2, TiO2 and MgO.

Inventors:
KISHINO, Tetsuya (6 Takeda Tobadono-cho, Fushimi-ku, Kyoto-sh, Kyoto 01, 〒6128501, JP)
Nozoe, Soichiro (6 Takeda Tobadono-cho, Fushimi-ku, Kyoto-sh, Kyoto 01, 〒6128501, JP)
ITO, Motoki (6 Takeda Tobadono-cho, Fushimi-ku, Kyoto-sh, Kyoto 01, 〒6128501, JP)
Application Number:
JP2018/025071
Publication Date:
January 10, 2019
Filing Date:
July 02, 2018
Export Citation:
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Assignee:
KYOCERA CORPORATION (6 Takeda Tobadono-cho, Fushimi-ku Kyoto-sh, Kyoto 01, 〒6128501, JP)
International Classes:
H03H9/25; H03H9/145; H03H9/72
Domestic Patent References:
WO2012086441A12012-06-28
WO2016047255A12016-03-31
WO2016100692A22016-06-23
WO2017068827A12017-04-27
WO2015137089A12015-09-17
Foreign References:
JP2005176321A2005-06-30
JP2005500778A2005-01-06
JP2007129391A2007-05-24
JP2014011570A2014-01-20
JP2016225727A2016-12-28
Attorney, Agent or Firm:
IIJIMA, YASUHIRO (Sohshin International Patent Office, SS building 2F 4-2, Nishi-Shinbashi 3-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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