Recent developments in SAW devices

For a long time, bulk acoustic wave devices have played an important part in signal processing. However, surface acoustic waves (SAW) remained virtually unexploited until White and Voltmer (1965) conducted a study concerning the direct piezoelectric coupling to SAW. Attention is given to a review of SAW devices employing interdigital transducers (IDTs), delay lines and multistrip couplers, bandpass filters, filter banks, dispersive delay lines, oscillators and resonators, and the convolver, which is a nonlinear SAW device that can operate as a programmable matched filter. The considered topics include the most significant advances in the field of SAW technology since the earlier review by Maines and Paige (1973).