Effect of filler on the microwave dielectric properties of polyethylene/ceramic composites
The present study investigates the effect of various ceramic fillers on the dielectric properties of polyethylene based composites. The fillers used were Sr<inf>9</inf>Ce<inf>2</inf>Ti<inf>12</inf>O<inf>36</inf> (SCT), Ca[(Li⅓Nb⅔)<inf>0.8</inf>Ti<inf>0.2</inf>]O<inf>3-δ</inf> (CLNT) and Sm<inf>2</inf>Si<inf>2</inf>O<inf>7</inf> (SS) with relative permittivities 173, 38 and 12 respectively. The composites were synthesized by melt mixing and hot pressing methods. The effect of different volume fractions of the ceramic (vf = 0 – 0.5) on the dielectric properties of the composites was investigated at 8 GHz. The dielectric properties (relative permittivity and dielectric loss) were found to increase with the ceramic filler content. The relative permittivities obtained experimentally were compared with that of the theoretical predictions.