Surface acoustic wave device

Details Surface acoustic wave device Surface acoustic wave device

2006-07-17

2008-08-12

San Martin, Jaydi A (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S31300R, C310S358000

Reexamination Certificate

active

07411333

ABSTRACT:
A SAW device comprises a single crystal piezo-electric strate (made, for example, of LiTaO3or LiNbO3), 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° (more preferably 46°±0.3°) from a Y-axis toward a Z-axis about an X-axis. The IDT presents a normalized thickness h/λ (h: thickness of electrode, and λ: 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.

REFERENCES:
patent: 6426584 (2002-07-01), Yoshida et al.
patent: 2006/0103486 (2006-05-01), Ruile et al.
patent: 2006/0158800 (2006-07-01), Takayama et al.
patent: 9-167936 (1997-06-01), None
patent: 2004-507960 (2004-03-01), None
patent: 2004254114 (2004-09-01), None

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