Microwave measurements of dielectric constants by mixture equations

This article reports on a study of the dielectric constant measurements of ceramic at microwave frequency by powder mixture equations. The dielectric constants of ceramics are indirectly obtained from the dielectric constants of ceramic-polymer composites. Dielectric properties of heterogeneous mixtures have been investigated by different authors for over one century. Theoretically, the dielectric constant of a pure ceramic can be calculated from that of the ceramic-polymer composite if the mixing rule has a good accuracy. One can estimate the dielectric constant of a pure ceramic by simply measuring a composite sample which saves the high temperature sintering procedure of making a pure ceramic sample for measurements.