Surface acoustic wave device and communication device

Details Surface acoustic wave device and communication device Surface acoustic wave device and communication device

2005-08-30

2005-08-30

Budd, Mark (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C333S193000

Reexamination Certificate

active

06936952

ABSTRACT:
A surface acoustic wave device has a balanced-to-unbalanced conversion function, in which the common mode in the vicinity of outside the passband is satisfactory. The surface acoustic wave device includes surface acoustic wave filters having interdigital transducers (IDTs) arranged along a surface acoustic wave propagation direction, which filters are provided on a piezoelectric substrate so as to have a balanced-to-unbalanced conversion function, and balanced signal terminals are correspondingly connected to the surface acoustic wave filters. Surface acoustic wave resonators including an interdigital transducer sandwiched between reflectors are correspondingly connected in series to the balanced signal terminals. The center-to-center distance between mutually adjacent electrode fingers in the reflectors and the interdigital transducer in one of the surface acoustic wave resonators differs from that of the other surface acoustic wave resonator.

REFERENCES:
patent: 6081172 (2000-06-01), Strauss et al.
patent: 6771144 (2004-08-01), Takamine
patent: 6798318 (2004-09-01), Abbott et al.
patent: 6815868 (2004-11-01), Shibata et al.
patent: 11-317642 (1999-11-01), None

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