ORGANIC-INORGANIC RF COMPOSITES WITH ENHANCED PERMITTIVITY BY NANOPARTICLE ADDITIONS

Organic-inorganic thermoplastic composites ofier a cost- efiective material choice with tuneable dielectric properties for various telecom components and applications. Typically such composites require substantial loading of inorganics to obtain a feasible level of permittivity at RF frequencies dramatically decreasing mechanical ruggedness and increasing losses. In this paper we demonstrate utilization of nanoparticle phase in BaSrTiO3-polypropylene-graft-poly (styrene-stat-divenylbenzene) composite to enhance the high frequency properties and overcome the problems associated with high flller loading. The efiect of nanosize silicon, silver and Al2O3 additives with difierent volume fractions in complex permittivity was investigated up to 1GHz. Signiflcant increase in the efiective permittivity of the composites with all the additives was observe, especially in the case of the nanosized silver particles where only 2 vol.% addition was able to enhance "r by 52% without increasing the dielectric losses when compared to the reference sample.