Journal of Microwave Power and Electromagnetic Energy (JMPEE)
TITLE	Solid and Particulate Material Permittivity Relationships [PDF]
AUTHORS	S. Nelson, A. Kraszewski and T. You 1991 26 1 45-51
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Abstract The complex permittivities of solid and pulverized samples of two plastics, Rexolite 1422 and Kynar, were measured at frequencies of 2.45 GHz, 11.5 GHz, and 22.0 GHz at 25°C by the short-circuited waveguide technique. Several dielectric mixture equations and extrapolation of functions of the real and imaginary parts of the permittivity that are linear with bulk density were then used to estimate the permittivities at solid-material densities from measurements on the pulverized samples. For these materials, the best estimates of the permittivities were provided by extrapolations that are consistent with the Complex Refractive Index and Landau and Lifshitz, Looyenga mixture equations. The Bottcher mixture equation often gave values very close to the Landau and Lifshitz, Looyenga equation, and the Bruggeman-Hanai, Rayleigh, and Lichtenecker mixture equations gave increasingly larger permittivity estimates in that order. Key Words: Dielectric mixtures, Permittivity, Dielectric constant, Loss factor, Bulk density, Mixture equations