Abstract
A new theoretical method is presented to analyze dispersion characteristics of SH-type SAWs propagating on periodic metallic grating structures using the variational theory and coupling-of-modes (COM) equations. The characteristics of SH-type SAWs propagating in short-circuited Al gratings on various crystals are studied and the calculated results agree well with those of typical Hashimoto's method. Also, some involved problems like dispersion parameters of SH-SAW along the ST-90oX quartz with Al electrode were first described. The advantages of this method are that the complicate Green's function is avoided, resulting in simple, clear and fast theoretical analysis.
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