Saw reflective array correlator with amplitude error compensatin

Details Saw reflective array correlator with amplitude error compensatin Saw reflective array correlator with amplitude error compensatin

1991-05-20

1992-08-11

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

333153, 333195, H01L 4108

Patent

active

051382156

ABSTRACT:
Amplitude error compensation is provided for a surface acoustic wave (SAW) reflective array correlator (RAC) device having a first reflective array grating fed by an input interdigital transducer and a second reflective array grating which feeds the reflected SAW signal output from the first array grating to an output interdigital transducer. A third or auxiliary reflective array grating is disposed between the first and second array gratings to reflect a portion of the SAW signals reflected from the first array grating to the second array grating to an acoustic absorber. The portion of the SAW signals reflected to the acoustic absorber are those SAW signals which when present in the output of the second array grating which is fed to the output transducer produce the unwanted amplitude errors. The third reflective array grating is fabricated of a photosensitive polymer material so that the frequency and amplitude selective configuration of the grating may be obtained by using photolithographic techniques.

REFERENCES:
patent: 3978437 (1976-08-01), Paige
patent: 4618841 (1986-10-01), Riha
patent: 4623853 (1986-11-01), Watanabe et al.
patent: 4672254 (1987-06-01), Dolat et al.
patent: 4745321 (1988-05-01), Raschke
patent: 4773138 (1988-09-01), Ballato et al.
patent: 4801836 (1989-01-01), Mariano
patent: 4916416 (1990-04-01), Desbois
500 MHz Bandwidth RAC Filter with Constant Groove Depth, by H. Gerard et , 1978 Ultrasonic Symposium Proceedings.

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