Saw filter device

Details Saw filter device Saw filter device

2008-06-03

2009-12-01

Lee, Benny (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

Reexamination Certificate

active

07626475

ABSTRACT:
A SAW filter device includes a SAW filter chip in which one-port surface acoustic wave resonators each including an IDT made of Al or an Al alloy, are provided on a θ-rotated Y-cut X-propagation LiNbO3substrate. The cutting angle θ of the θ-rotated Y-cut X-propagation LiNbO3substrate is in the range between about 50° and about 55°. The normalized film thickness of the IDT 100h/λ (%) (h denotes the thickness of the IDT and λ denotes the wavelength of a surface acoustic wave) is in the range between about 2% and about 4%. The duty ratio of the IDT is equal to or less than about 0.4.

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Official communication issued in the International Application No. PCT/JP2007/050020, mailed on Apr. 17, 2007.

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