Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2009-06-09
2011-10-18
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S193000, C333S189000
Reexamination Certificate
active
08040205
ABSTRACT:
A duplexer includes a substrate including an insulation layer, an upper interconnection layer provided on an upper surface of the insulation layer, a lower interconnection layer provided on a lower surface of the insulation layer, and an inner interconnection layer provided in the insulation layer, the inner interconnection layer including an inner ground pad, at least one acoustic wave filter chip mounted on an upper surface of the substrate, signal pads provided on the upper interconnection layer and connected to signal electrodes of the at least one acoustic wave filter chip, and an upper ground pad that is provided in the upper interconnection layer so as to be located between the signal pads and is connected to a ground electrode of the at least one acoustic wave filter, wherein D1>D2and D1>T1where D1is a minimum distance between the signal pads and the upper ground pad, D2is a minimum distance between the signal pads and the inner ground pad, and T1is a thickness of the insulation layer between the upper interconnection layer and the inner interconnection layer.
REFERENCES:
patent: 7884686 (2011-02-01), Pitschi et al.
patent: 2007/0069834 (2007-03-01), Ikuta et al.
patent: 2002-076829 (2002-03-01), None
patent: 2006-060747 (2006-03-01), None
Hatano Koichi
Tsutsumi Jun
Arent & Fox LLP
Summons Barbara
Taiyo Yuden Co. Ltd.
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