Surface acoustic wave filter and duplexer using the same

Details Surface acoustic wave filter and duplexer using the same Surface acoustic wave filter and duplexer using the same

2006-04-28

2008-09-16

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000, C333S195000, C310S31300R

Reexamination Certificate

active

07425878

ABSTRACT:
A multimode type SAW filter includes a piezoelectric substrate, and IDT groups formed on the piezoelectric substrate, the IDT groups each having multiple IDTs connected in series in which an input/output electrode and a ground electrode are coupled via a floating conductor. Adjacent electrode fingers between adjacent IDTs among the multiple IDTs of the IDT groups include a first electrode finger connected to the floating conductor in one of the IDT groups and a second electrode finger connected to one of the input/output electrode and the ground electrode in another one of the IDT groups.

REFERENCES:
patent: 4425554 (1984-01-01), Morishita et al.
patent: 7138890 (2006-11-01), Nakamura et al.
patent: 7212086 (2007-05-01), Nishizawa et al.
patent: 2003-249842 (2003-09-01), None
patent: 2004-194269 (2004-07-01), None

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