Elastic wave element, and electrical apparatus and duplexer using same
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United States of America Patent
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Aug 23, 2016
Grant Date -
Jun 7, 2012
app pub date -
Oct 29, 2010
filing date -
Nov 2, 2009
priority date (Note) -
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Abstract
An acoustic wave device includes a piezoelectric substrate made of a lithium niobate material having the Euler angles (φ, θ, ψ), an electrode disposed on the piezoelectric substrate for exciting a major acoustic wave of a wavelength λ, and a protective layer disposed on the piezoelectric substrate to cover the electrode. The protective layer has a thickness greater than 0.27λ. The Euler angles satisfy −100°≦θ≦−60°; 1.193φ−2°≦ψ≦1.193φ+2°; and either ψ≦−2φ−3° or −2φ+3°≦ψ.
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