Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1999-04-15
2000-02-08
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
H03H 972
Patent
active
06023122&
ABSTRACT:
A SAW device has tapered trasnsducers each of which is divided into two or more tapered transducer parts, which are arranged in line with one another in one or more SAW tracks with the tapers of adjacent tapered transducer parts complementary to one another to provide a compact arrangement. The tapered transducer parts can be symmetrically or asymmetrically tapered to provide different frequency bands for band or bandwidth switching of the SAW device. Input and output impedances of the SAW device can be maintained during such switching by switching of dummy transducer parts also provided on the same piezoelectric substrate.
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Beaudin Steve A.
Cameron Thomas P.
Liu Wen
Dougherty Thomas M.
Haley R. John
Nortel Networks Corporation
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