| 摘要 |
A surface acoustic wave element comprising electrodes for propagating surface acoustic waves formed on a piezoelectric substrate made of lithium niobate or lithium tantalate. When the cut face and surface acoustic wave propagating direction of the piezoelectric substrate made of lithium niobate are expressed by Euler angles ( phi , theta , psi ) and a range substantially equivalent to the angles, the phi , theta and psi are respectively set at 0-86 DEG or 95-180 DEG , 73-118 DEG , and 0-44 DEG . In addition, when the cut face and surface acoustic wave propagating direction of the piezoelectric substrate made of lithium tantalate are expressed by Euler angles ( phi , theta , psi ) and a range substantially equivalent to the angles, the phi , theta and psi are respectively set at 0-87 DEG or 91-180 DEG , 80-120 DEG , and 0-44 DEG . Therefore, a high-performance surface acoustic wave element can be obtained.
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