Acoustic wave filter

Details Acoustic wave filter Acoustic wave filter

2009-01-26

2010-06-01

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C310S31300R

Reexamination Certificate

active

07728699

ABSTRACT:
A longitudinally coupled resonator acoustic wave filter device that utilizes an inter-IDT resonance mode with a reduced insertion loss has a structure in which apodization weights are assigned in first to third IDTs having narrow pitch electrode finger portions in portions other than the narrow pitch electrode finger portions, such that the electrode finger overlap width sequentially varies in an acoustic wave propagating direction in which an acoustic wave propagates, and portions of the IDTs located at ends adjacent to the narrow pitch electrode finger portions have a maximum electrode finger overlap width.

REFERENCES:
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patent: 5936488 (1999-08-01), Taguchi et al.
patent: 2005/0001696 (2005-01-01), Otsuka et al.
patent: 2006/0208834 (2006-09-01), Takamine
patent: 09-205342 (1997-08-01), None
patent: 9-214281 (1997-08-01), None
patent: 10-261936 (1998-09-01), None
Official Communication issued in International Patent Application No. PCT/JP2007/066305, mailed on Oct. 9, 2007.

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