An Improved Transducer Configuration for Phase-Coded Surface Acoustic Wave Devices

Abstract

The influence of second order effects on the performance of a 13 bit phase-coded surface acoustic wave (SAW) device, realized on Y-Z LiNbO₃, is demonstrated. A bandpass sampling technique is used to reduce the acoustic regeneration phenomenon in highly dispersive delay lines. An improvement in the correlation peak of a 6.5 use long phase-coded delay line is obtained after reducing the member of sensors by this technique. The results are compared with the device fabricated using conventional design methodology. The degradation in the impulse response due to acoustic regeneration is compared for the devices fabricated on high and low coupling materials.

Indexing terms:

• Barker code
• Regeneration
• Bandpass sampling