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AssigneeSanyo Electric Co., Ltd.
InventorsYasutaka Shimizu, Atsuhiro Nishikata, Shigetaka Tonami
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The surface acoustic wave device of the invention comprises a piezoelectric substrate of lithium niobate or lithium tantalate and electrodes formed on the substrate for propagating surface acoustic waves. The substrate has a cut plane and a surface acoustic wave propagation direction which are (.phi., .theta., .psi.) as expressed in Eulerian angles and within ranges substantially equivalent thereto. When the substrate is made of lithium niobate, .phi., .theta. and .psi. are 0.degree.-86.degree. or 95.degree.-180.degree., 73.degree.-118.degree. and 0.degree.-44.degree., respectively. When the substrate is made of lithium tantalate, .phi., .theta. and .psi. are 0.degree.-87.degree. or 91.degree.-180.degree., 80.degree.-120.degree. and 0.degree.-44.degree., respectively. This enables the device to exhibit high performance.
A surface acoustic wave device, comprising:
A surface acoustic wave device, comprising:
A surface acoustic wave device, comprising:
A surface acoustic wave device, comprising:
A portable telephone including a surface acoustic wave filter, comprising at least one surface acoustic wave device, wherein the surface acoustic wave device comprises a piezoelectric substrate of lithium niobate and electrodes formed on the substrate for propagating second leaky waves, wherein the piezoelectric substrate has a cut plane and a surface acoustic wave propagation direction which are (.phi., .theta., .psi.) as expressed in Eulerian angles and within ranges substantially equivalent thereto, the angles .phi., .theta. and .psi. being within the respective ranges of the following mathematical expressions:
A portable telephone including a surface acoustic wave filter, comprising at least one surface acoustic wave device, wherein the surface acoustic wave device comprises a piezoelectric substrate of lithium niobate and electrodes formed on the substrate for propagating second leaky waves, wherein the piezoelectric substrate has a cut plane and a surface acoustic wave propagation direction which are (.phi., .theta., .psi.) as expressed in Eulerian angles and within ranges substantially equivalent thereto, the angles .phi., .theta. and .psi. being within the respective ranges of the following mathematical expressions:
A portable telephone including a surface acoustic wave filter, comprising at least one surface acoustic wave device, wherein the surface acoustic wave device comprises a piezoelectric substrate of lithium tantalate and electrodes formed on the substrate for propagating second leaky waves, wherein the piezoelectric substrate has a cut plane and a surface acoustic wave propagation direction which are (.phi., .theta., .psi.) as expressed in Eulerian angles and within ranges substantially equivalent thereto, the angles .phi., .theta. and .psi. being within the respective ranges of the following mathematical expressions:
A portable telephone including a surface acoustic wave filter, comprising at least one surface acoustic wave device, wherein the surface acoustic wave device comprises a piezoelectric substrate of lithium tantalate and electrodes formed on the substrate for propagating second leaky waves, wherein the piezoelectric substrate has a cut plane and a surface acoustic wave propagation direction which are (.phi., .theta., .psi.) as expressed in Eulerian angles substantially equivalent thereto, the angles .phi., .theta. and .psi. being within the respective ranges of the following mathematical expressions:
Dependencies are inferred from the claim text.