Filter including acoustic wave filters connected in parallel

Details Filter including acoustic wave filters connected in parallel Filter including acoustic wave filters connected in parallel

2008-01-10

2009-12-08

Takaoka, Dean O (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000

Reexamination Certificate

active

07629864

ABSTRACT:
A filter includes: a first acoustic wave filter having acoustic wave filters cascaded, an input stage of the acoustic wave filters including a first multimode filter; a second acoustic wave filter having acoustic wave filters cascaded, an input stage of these acoustic wave filters including a second multimode filter having an aperture length different from that of the first multimode filter, the second acoustic wave filter receiving an unbalanced in signal applied to the first acoustic wave filter, and having a pass band that does not overlap with that of the first acoustic wave filter.

REFERENCES:
patent: 7212086 (2007-05-01), Nishizawa
patent: 7425878 (2008-09-01), Inoue et al.
patent: 2002/0135267 (2002-09-01), Takamine
patent: 11-68512 (1999-03-01), None
patent: 2001-358556 (2001-12-01), None
patent: 2002-208832 (2002-07-01), None
patent: 3480445 (2003-10-01), None

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