In situ compensation of surface acoustic wave filter response

Cohn, R. W.; Wagers, R. S.
December 1985
Applied Physics Letters;12/15/1985, Vol. 47 Issue 12, p1269
Academic Journal
An experimental methodology is demonstrated for compensating the response of surface acoustic wave (SAW) bandpass filters. For a filter on (YZ) LiNbO[sub 3], we present measurements of changes in the SAW impulse and frequency response produced by in situ perturbations to the transducer's apodization. Many transducer electrodes are perturbed in their length to determine filter sensitivity to electrode length variation. A methodology that is adaptive in these length variables is applied to determine the optimal apodization for the compensation of frequency domain sidelobes initially at the - 26 dB level. They are deterministically reduced to the - 39 dB level.


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