Microwave Measurements of Dielectric Properties Using a Closed Cylindrical Cavity Dielectric Resonator

Microwave measurements of the dielectric constant and loss tangent of homogeneous isotropic samples in rod form, using a closed cylindrical cavity resonator, are described. The measurements are made at the resonant frequency of the TE
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is mode. A new simple field model of the resonator is developed. This model provides a very simple and clear description of the field distribution within the resonator. The dielectric properties are computed from the resonant frequency, sample dimensions and unloaded quality factor of the resonator. The effect of conductivity losses within the metal cavity is examined. The measurement accuracy is assessed by comparing the results with those obtained using other well-known techniques.