Abstract
Methods of measuring the dielectric properties of granular and powdered or pulverized materials at microwave frequencies are discussed. Factors affecting the dielectric properties of materials, such as frequency, moisture content, temperature and bulk density, are reviewed, and the nature of their influence is discussed. Dielectric properties measured for some particulate materials are presented to illustrate their variation with these variables. Relationships between the dielectric constants and loss factors of particulate materials and the bulk density of these materials are discussed, and data illustrating these relationships are presented. Dielectric mixture equations are identified for use in correlating the dielectric properties of particulate materials with their bulk densities and for use in estimating the dielectric properties of the particles from measurements of the dielectric properties and densities of particulate materials.
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