Synergism on electromagnetic inductance (EMI)‐shielding in metal‐ and ferroelectric‐particle filled polymers

Abstract

Abstract In this paper the electromagnetic inductance (EMI)‐shielding of metal‐and ferroelectric‐particle filled polymers is described. The composite, containing only metallic fillers, has a shielding effectiveness comparable to conventional products. The addition of a few percent of ferroelectric material to this composite enhances the shielding behavior by several orders of magnitude—without increasing its electrical conductivity. In this three component composite the shielding effectiveness reaches a maximum close to the ferroelectric/paraelectric transition temperature. The synergetic effect, obtained by the addition of ferroelectrical particles, is related to the high dielectric losses of ferroelectric material close to its transition temperature.