Single and double side grating devices built on thin quartz plates for the excitation of surface transverse waves

A theoretical study of Surface Transverse Waves (STW) properties propagating on piezoelectric plates of finite thickness is proposed. Both cases of single and double side grating are considered in the model. The mechanical and electrical boundary conditions are described and the validity of the assumption used for the model is discussed in regard with experimental results. These results have been obtained for 140 /spl mu/m thick Z-cut plates and for 128 pm thick AT-cut plates with single-side aluminum strip gratings. Different delay lines have been fabricated. A relation between the theoretical dispersion curves exhibiting the existence of multiple frequency stopbands and the experimental frequency responses is emphasized. Also the frequency-temperature behaviour of a delay line built on a Z-cut plate has been measured.