Acoustic wave filter apparatus

Details Acoustic wave filter apparatus Acoustic wave filter apparatus

2011-01-11

2011-01-11

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000

Reexamination Certificate

active

07868716

ABSTRACT:
An acoustic wave filter apparatus where first balance input/output terminals of first and second acoustic wave filter sections are commonly connected to each other and then connected to a first balance terminal, second balance input/output terminals thereof are commonly connected to each other and then connected to a second balanced terminal, the first and second balance input/output terminals of the first acoustic wave filter section are coupled to the first and second balance terminals, respectively, via first and third wiring lines and first and third acoustic wave resonators, respectively, the first and second balance input/output terminals of the second acoustic wave filter section are coupled to the first and second balance terminals, respectively, via second and fourth wiring lines and second and fourth acoustic wave resonators, respectively, and the second wiring line and the third wiring line cross each other on a piezoelectric substrate.

REFERENCES:
patent: 7283016 (2007-10-01), Haruta et al.
patent: 7804380 (2010-09-01), Funahashi et al.
patent: 2002/0135267 (2002-09-01), Takamine
patent: 2004/0196119 (2004-10-01), Shibahara et al.
patent: 2002-208832 (2002-07-01), None
patent: 2004-282707 (2004-10-01), None
patent: 2006/003787 (2006-01-01), None
Official Communication issued in International Patent Application No. PCT/JP2007/074920, mailed on Apr. 1, 2008.

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