Surface acoustic device

Details Surface acoustic device Surface acoustic device

2007-05-22

2007-05-22

Budd, Mark (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S31300R, C310S31300R

Reexamination Certificate

active

10989549

ABSTRACT:
A surface acoustic wave device includes a piezoelectric substrate, a first and a second interdigital transducers (IDTs) provided on the piezoelectric substrate. The first IDT includes multiple tracks having different frequency characteristics that are connected in parallel. The second IDT includes a normalized electrode pattern. The frequency characteristic of the multiple tracks is asymmetric to a center frequency of the SAW filter, substantially flat in a passband when those of the multiple tracks are overlapped, or complementary in the passband. Thus, it is possible to provide the surface acoustic wave device having a high damping property.

REFERENCES:
patent: 4583047 (1986-04-01), Le Goff epouse Henaff et al.
patent: 4748364 (1988-05-01), Mitsutsuka
patent: 4764701 (1988-08-01), Garbacz et al.
patent: 5136266 (1992-08-01), Niitsuma
patent: 5313178 (1994-05-01), Yamamoto
patent: 10-41778 (1998-02-01), None

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