JFET_V6_N1_RP1 Nelson V.K. Karthikeyan S. Journal on Future Engineering and Technology 2230 – 7184 6 1 6 13 Wave Propagation, Pyroelectric, Plates, LEMV, CFRP Harmonic Wave propagation in an infinite pyroelectric sandwich plate (SWP) is analyzed for three dimensional motions. The sandwich plate is made up of two identical layer of class 6 bonded together by a Linear Elastic Material with Voids (LEMV). The exact frequency equation for wave propagating at an arbitrary angle of propagation is derived when the surfaces of the plates are traction free and completely coated with electrodes that are shorted and thermally insulated. Numerical results are given in the form of data and dispersion curves for the symmetric and asymmetric modes of vibrations of the SWP ceramic-1/Adhesive/ceramic-2 by taking adherent as BaTio and the adhesive as an existing 3 Carbon Fibre Reinforced Polymer (CFRP) or as a hypothetical LEMV with and without voids are compared with that of a single layered pyroelectric plate. The damping effect is analyzed through the imaginary parts of the complex frequencies. August - October 2010 Copyright © 2010 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=1289