Abstract
High frequency surface acoustic waves (SAWs) have been applied in telecommunication devices for some years. For SAW excitation and detection interdigital transducers (IDTs) are used, consisting of interlocked metal comb electrodes lithographically fabricated on piezoelectric substrates. The amplitude-to-frequency characteristics of transmitted signals essentially dependent on the IDT’s geometry as well as on the material properties of the substrate. When small aperture IDTs are used diffraction effects may significantly influence the device behaviour. However, the influence of diffraction on wave propagation depends on crystal symmetry and SAW propagation direction since the angular dispersion of the phase velocity can increase as well as decrease diffraction phenomena. The material anisotropy can strongly extend the near field region of SAW diffraction. Indeed, this is of special interest since, in contrast to optics, SAW devices mostly operate in the near filed Fresnel region.
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