The propagation of lowest-order symmetric (S-0) and anti-symmetric (A(0)) Lamb wave modes in a functionally graded piezoelectric material (FGPM) is investigated. The electromechanical material properties change continuously with the thickness of the layer with exponential variation. The first-order differential equations are solved by Peano-Series method. A comparative study has been carried with the ordinary differential equation (ODE). A good agreement is observed between the two methods. The influence of the gradient coefficients of the FGPM on the dispersion curves and the electromechanical coupling factor are investigated., Further, the effect of polarization direction on the electromechanical coupling factor is also illustrated.
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