Balanced SAW filter

Details Balanced SAW filter Balanced SAW filter

2008-05-27

2008-05-27

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S195000

Reexamination Certificate

active

07378923

ABSTRACT:
A 5-IDT longitudinally coupled resonator-type SAW filter has a balanced-to-unbalanced conversion function. In areas where first to fifth IDTs are adjacent to each other, each IDT includes a narrow-pitched electrode finger portion. The IDTs are configured such that one condition selected from among conditions (1) to (3) and one condition selected from among conditions (4) to (6) are satisfied when the numbers and pitches of electrode fingers in the narrow-pitched portions of the first to fifth IDTs are denoted by N1and P1, N2aand P2a, N2band P2b, N3and P3, N4aand P4a, N4band P4b, and N5and P5, respectively:Conditions (1): When N1=N3=N5, 0.992≦P1/P3≦1.008 and P1=P5(2): When N1=N5<N3, 0.9≦P1/P3<1 and P1=P5(3): When N3<N1=N5, 1 <P1/P3≦1.1 and P1=P5(4): When N2a=N2b=N4a=N4b, 0.991≦P2a/P2b≦1.009 and P2a/P2b=P4b/P4a(5): When N2a=N4b>N2b=N4a, 1<P2a/P2b≦1.1 and P2a/P2b=P4b/P4a(6): When N2a=N4b<N2b=N4a, 0.9≦P2a/P2b<1 and P2a/P2b=P4b/P4aWhen Conditions (1) and (4) are selected, Condition (7): N1≠N2aor P1≠P2ais satisfied.

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Official Communication for PCT Application No. PCT/JP2005/023260; mailed on Apr. 4, 2006.

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