Polymer blends of polypyrrole (PPy)-conducting particles dispersed in poly(ethylene-co-vinyl acetate) (EVA) matrix were prepared. The dielectric properties were determined, and we have examined how these properties depend on the relative concentration of the conducting (PPy) and dielectric (EVA) blends. The dielectric constant increases appreciably by increasing the PPy contents in the blend matrix. A previous proposed model by Tsangaris et al, for the calculation of effective dielectric constant, was tested and approaches the experimental values more closely for low PPy contents.