Interdigital transducer, surface acoustic wave filter, and...

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

Reexamination Certificate

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C310S31300R, C310S31300R, C333S195000, C333S194000

Reexamination Certificate

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06870302

ABSTRACT:
An interdigital transducer hasone-wavelength basic units of a single phase unidirectional transducer a plurality of each having three electrode fingers within one wavelength; anda plurality of one-wavelength basic units of a bidirectional electrode each having four electrode fingers within the one wavelength,wherein the one-wavelength basic units are properly arranged according to a desired filter characteristic, andone of the three electrode fingers of each one-wavelength basic unit of the single phase unidirectional transducer is wider than the two other electrode fingers, andof the four electrode fingers of each one-wavelength basic unit of the bidirectional electrode, one pair of two fingers is interdigitated to the other pair of two fingers, andan adjustment section is provided between the one-wavelength basic units of the single phase unidirectional transducer and the one-wavelength basic units of the bidirectional electrode.

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Nakamura et al., “A New Design Concept for Low-Loss SAW Filters Based on Different-Width Split-Finger SPUDT”, IEEE Transactions on Microwave Theory and Techniques, IEEE Inc., New York, US, vol. 49, No. 4, Part 2, Apr., 2001, pp. 761-768.
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