Predicting effective permittivity of composites containing conductive inclusions at microwave frequencies

摘要: We predict the effective dielectric properties at microwave frequencies of composites containing various volume loadings high conductivity (stainless steel or iron) spheres flakes by adapting semi-empirical method developed McLachlan. Rather than typical approach fixing A (A = 1/vc – 1, where vc is percolation threshold) for a given inclusion shape, we consider it as an unknown and fix one geometric exponents. observe that varies linearly with inverse loading higher slope spheres. The exponent consistently iron stainless steel. achieve good agreement between measured calculated permittivity over wide range loadings, shapes, materials from 3 to 20 GHz.