Surface acoustic wave device
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United States of America Patent
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Aug 12, 2008
Grant Date -
Jan 25, 2007
app pub date -
Jul 17, 2006
filing date -
Jul 21, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A SAW device comprises a single crystal piezo-electric strate (made, for example, of LiTaO.sub.3 or LiNbO.sub.3), 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.degree. to 48.degree. (more preferably 46.degree..+-.0.3.degree.) from a Y-axis toward a Z-axis about an X-axis. The IDT presents a normalized thickness h/.lamda. (h: thickness of electrode, and .lamda.: spacing between digits of the IDT) of 7% to 11%. A more appropriate substrate cut angle can be shown for the SAW device which employs a piezo-electric substrate containing an additive, to improve the electric characteristics thereof.
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