| 摘要 |
A SAW device comprises a single crystal piezo-electric strate (made, for example, of LiTaO<SUB>3 </SUB>or LiNbO<SUB>3</SUB>), and an interdigital transducer (IDT) formed of a material mainly containing Al and disposed on the piezo-electric substrate. The piezo-electric strate contains an additive (for example, Fe, Mn, Cu, Ti), and an orientation rotated by an angle in a range of 42° to 48°re preferably 46°±0.3°) from a Y-axis toward a Z-axis about an axis. The IDT presents a normalized thickness h/lambda (h: thickness electrode, and lambda: spacing between digits of the IDT) of 7% to 11%. A more appropriate substrate cut angle can be shown for the device which employs a piezo-electric substrate containing an additive, to improve the electric characteristics thereof.
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