Determination of dielectric characteristics of materials using a volumetric resonator

The development of microwave electrical technologies requires accurate and reliable measurements of the dielectric properties of materials. This is especially important for materials with a wide range of dielectric constant and dielectric loss tangent values, for which traditional analysis methods are either insufficiently sensitive or excessively complex. The purpose of this work is to determine the dielectric characteristics of materials using a volume resonator at a frequency of 2.45 GHz. The parameters of the resonator, such as the resonant frequency and quality factor, were analyzed to determine the dielectric properties of the materials. Numerical modeling of the resonator was performed to study the distribution of electric and magnetic fields of the main mode TM010. The analysis of the excitation conditions of the main and parasitic modes revealed their influence on the accuracy of measuring the parameters of the resonator and determining the dielectric properties of objects. It is shown that the calculated values of the dielectric constant and the tangent of the loss angle of materials are in good agreement with the literature data (the error is ~3 and ~6%, respectively). The results obtained can be used to determine the dielectric characteristics of materials in a wide range of values by the resonator method and to study the electrophysical properties of materials and media.

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