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A degenerate nonlinear surface-wave convolver has been built from nonsymmetrical couplers working as beamwidth compressors to increase the acoustic power density and thus the bilinear merit factor. The measured results are compared with those of the classical LiNbO3 convolver, and the practical advantages of this new structure are pointed out. To demonstrate the device capability, the autocorrelation function of a linear f.m. pulse whose b.t. product was 120 has been performed.
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Defranould et al. (1974) studied this question.
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