Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2007-04-18
2008-05-06
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S195000
Reexamination Certificate
active
07369016
ABSTRACT:
In a balanced SAW filter, a second IDT and a fourth IDT of a five IDT type first longitudinally-coupled-resonator SAW filter element are connected via first and second wiring lines to a seventh IDT and a ninth IDT of a five IDT type second longitudinally-coupled-resonator SAW filter element, respectively. First, third, and fifth IDTs are connected to an unbalanced terminal. A sixth IDT and a first sub-IDT portion are connected to a first balanced terminal. A second sub-IDT portion and a tenth IDT are connected to a second balanced terminal. The IDTs are arranged such that the phase of an electrical signal transmitted through the first wiring line differs by 180 degrees from the phase of an electrical signal transmitted through the second wiring line.
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Official Communication for PCT Application No. PCT/JP2005/018755; mailed on Jan. 17, 2006.
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
Summons Barbara
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