Electrically conductive fillers with improved microwave shielding performance

Abstract

An electrically conductive composite powder is provided for microwave shielding applications. The electrically conductive composite powder includes a core of particles formed from a material having a low density of <5 g/cm3 and a high dielectric constant of ≥10; an intermediate layer coated onto the core of particles, wherein said intermediate layer has a high electrical conductivity of >5.90×10−8 Ohm*m at 20° C.; and an outer layer that is deposited onto the intermediate layer, said outer layer comprising a material having a high oxidation and corrosion resistance of >−0.2V galvanic potential in seawater as measured via ASTM G82. The electrically conductive composite powder exhibits excellent microwave shielding performance, while also being substantially lower in cost that conventional Ag/Ni shields. The electrically conductive composite powder can be used across a broad microwave frequency range.

Dependencies are inferred from the claim text.