Surface acoustic wave device suitable for use in GHz band

Details Surface acoustic wave device suitable for use in GHz band Surface acoustic wave device suitable for use in GHz band

2005-01-04

2005-01-04

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

06838807

ABSTRACT:
IDT electrodes are formed by a Cu alloy. When the wavelength of a SAW propagating in the direction of the X axis of a piezoelectric substrate is indicated by λ, and when the thickness of the IDT electrodes is indicated by H, the standardized thickness H/λ of the IDT electrodes ranges from 0.045 to 0.070, and the piezoelectric substrate is a rotated Y-cut LiTaO3substrate whose rotational cut angle θ from the Y axis to the Z axis around the X axis ranges from 52.0° to 58.0°. With this arrangement, the reflection coefficient S11 becomes 0.88 or higher.

REFERENCES:
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patent: 5315432 (1994-05-01), Ohno
patent: 5359452 (1994-10-01), Nitanda et al.
patent: 6172582 (2001-01-01), Hickernell
patent: 6407486 (2002-06-01), Kimura et al.
patent: 6677696 (2004-01-01), Ruile
patent: 2001-251157 (2001-09-01), None
patent: 2002-26685 (2002-01-01), None

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