Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2011-05-17
2011-05-17
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S195000, C310S31300R
Reexamination Certificate
active
07944329
ABSTRACT:
An acoustic wave filter device has a balance-unbalance conversion function and has an increased out-of-band attenuation. The acoustic wave filter device includes a 5-IDT-type longitudinally coupled resonator-type acoustic wave filter unit including IDTs that are connected between an unbalanced terminal and first and second balanced terminals, and the IDTs and are connected to the first and second balanced terminals, respectively, that is arranged between the unbalanced terminal and the first and second balanced terminals. A second ground wiring that connects the end portions of the unbalanced-side IDT on the side connected to the ground potential to a ground terminal is separated from a first ground wiring. The second ground wiring includes first and second branched wiring portions, and the first and second branched wiring portions are arranged so as to sandwich an area in which the IDTs are provided.
REFERENCES:
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Official Communication issued in International Patent Application No. PCT/JP2009/001027, mailed on Jun. 2, 2009.
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
Summons Barbara
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