Improved Sample Volume in Cylindrical Perturbed Cavity for Permittivity Calculation

An estimate of the maximum volume of a dielectric material, based on the cavity perturbation technique, is performed for accurate calculation of the complex permittivity. It is observed that a cylindrical perturbed cavity makes it possible to obtain a maximum volume ratio of dielectric sample to cavity which is more appreciable in comparison with a rectangular perturbed cavity. Some geometries and natures of the sample have been tested and a low loss material with a low dielectric constant and a thin disk shape ensures the best maximum volume ratio.