Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1991-04-19
1992-07-14
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
333153, 333195, H01L 4108
Patent
active
051305976
ABSTRACT:
An amplitude error compensated surface acoustic wave reflective array corator is provided having an input interdigital transducer feeding a first slanted reflective array grating, a second slanted reflective array grating feeding an output transducer and a third, amplitude error compensation slanted reflective array grating feeding the output transducer. The third array grating receives only the leakage surface acoustic waves leaking past the second array grating from the first array grating and has a frequency and amplitude selective configuration which enables it to select those leakage surface acoustic wave signals which when added to the output of the second array grating by means of a multistrip coupler and fed to the output transducer provide an amplitude error compensated output RF signal. The frequency and amplitude selective configuration of the third array grating is obtained by forming the grating of discreet packets of reflectors, controlling the spatial location of the packets along the length of the array, the number and length of the reflectors in each packet and, if reflective grooves are employed, the depths of the grooves.
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Budd Mark O.
Dougherty Thomas M.
Maikis Robert A.
The United States of America as represented by the Secretary of
Zelenka Michael
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