DETERMINATION OF THE DIELECTRIC CONSTANT AND THE LOSS FACTOR OF FOAM-BASE DIELECTRICS,

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Abstract:

The article applies the logarithmic mixing law to the case of composite dielectrics consisting of synthetic resins or ceramics and trapped air pockets. Formulae are derived for both the dielectric constant and the loss factor tan delta of such foambase materials. Numerical values are obtained by measurement and comparing foamy samples with solid ones made of the same materials in the same shape. The actual values thus determined, i.e. by weighting, are tabulated for eight groups of dielectric compounds Polyethylenes, polyvinylbutyrales, hard polyurethanes, silicones, polystyroles, epoxies, phenols and cellulose acetate. The data are taken from several sources variations are attributed to water content, manufacturing processes and storage.

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