Surface acoustic wave devices using electrostrictive transduction

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Abstract
The authors discuss the generation of surface acoustic waves (SAW) on a biased electrostrictive substrate rather than a piezoelectric substrate. Two electrode structures have been used: an interdigital pattern with an interleaving bias electrode, and a grating array pattern. Surface acoustic waves have been launched on strontium titanate and potassium tantalate niobate (KTN). The conversion efficiency and band-width of the transducers were measured for various electrode geometries. A theoretical relationship between the electrostrictive coefficient and the relevant photoelastic coefficient is derived and discussed, and experimental verification of the relationship is presented. The behaviour of the insertion loss of SAW on SrTi03 between 77 and 300K is described. Measurements of the dielectric permittivity and loss tangent of KTN between 10 Hz and 100 MHz and as a function of temperature are presented. It is concluded that SrTiO3 shows an induced piezoelectric effect large enough for device applications.

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