Abstract
Absfracf-Acoustic surface-wave correlation filters for phaseshift-keyed (phase-coded) waveforms have been characterized. The filters were constructed using a surface-wave tapped-delayline technique that resulted in highly compact devices. Both 7- and &bit Barker sequences have been fabricated on Y-cut LiNbO, for propagation in the Z direction. For purposes of evaluation, 20- and 30-MHz center frequencies were used with information bandwidths of 1.6 and 5.0 MHz, respectively. Measurements of the time and frequency domain responses, sidelobe levels, insertion loss, temperature sensitivity, and noise performance have been made. The results obtained closely follow theoretical predictions. Although some problems exist in the control of reflections and secondary generation of the signal, the feasibility of practical acoustic surfacewave digital filters has been demonstrated.
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