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ELASTIC WAVE DEVICE AND FILTER DEVICE

  • US 20160294361A1
  • Filed: 06/20/2016
  • Published: 10/06/2016
  • Est. Priority Date: 12/26/2013
  • Status: Active Grant
First Claim
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1. An elastic wave device comprising:

  • a piezoelectric film made of LiTaO3; and

    an IDT electrode located on one surface of the piezoelectric film;

    whereinthe IDT electrode includes a plurality of first electrode fingers and a plurality of second electrode fingers that are alternately arranged;

    a thickness of the piezoelectric film is about 10λ

    or less when λ

    is a wavelength determined by a pitch of the electrode fingers of the IDT electrode; and

    a direction of a line connecting distal ends of the plurality of first electrode fingers and a direction of a line connecting distal ends of the second electrode fingers are at an oblique angle ν

    with respect to a propagation direction ψ

    of an elastic wave excited by the IDT electrode, the propagation direction ψ

    being determined by Euler angles (φ

    , θ

    , ψ

    ) of the LiTaO3, and the oblique angle ν

    is in a range of about 0.4°

    or more and about 15°

    or less.

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