Balanced acoustic wave filter

Details Balanced acoustic wave filter Balanced acoustic wave filter

2007-06-07

2008-09-30

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000, C333S196000

Reexamination Certificate

active

07429905

ABSTRACT:
An acoustic wave filter device includes a piezoelectric substrate and a longitudinally coupled resonator surface acoustic wave filter unit provided on the piezoelectric substrate. The surface acoustic wave filter unit includes first to fifth IDTs arranged in a surface wave propagation direction. The first, third, and fifth IDTs are connected to an unbalanced terminal, while the second and fourth IDTs are connected to first and second balanced terminals, respectively. The second IDT includes first and second sub-IDT portions obtained by dividing the second IDT and arranged in a crossing width direction, and the fourth IDT includes first and second sub-IDT portions obtained by dividing the fourth IDT and arranged in the crossing width direction. The first and second sub-IDT portions are connected in series. The first and second sub-IDT portions are also connected in series.

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Official Communication for PCT Application No. PCT/JP2005/023261; mailed on Apr. 4, 2006.

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