Measurements of microwave dielectric properties by an amended cavity perturbation technique

The accuracy of an amendment theory on the cavity perturbation technique for microwave dielectric properties measurements has been studied. The accuracy was confirmed by comparisons of experimental results with those measured by another well known measurement method – post resonance technique. Based on the conventional circular aperture coupling structure, a new equation is proposed to determine the quality factor of TE modes for the rectangular cavity resonator. The relation of quality factor with the aperture radius was studied for determining the adequate aperture diameter.