Measurement of Complex Permittivity for Materials Under Microwave Heating Using Cylindrical Resonator

摘要

To measure the temperature dependent complex permittivity for dielectric materials, a TM010 mode of cylindrical cavity resonator at a frequency of 2.45 GHz has been designed. In the measurement, the output power of vector network analyzer is gained with RF power amplifier to heat materials while simultaneously obtaining complex permittivity by measuring transmission coefficient. The experimental results are examined, and the measuring accuracy of complex permittivity by the perturbation method is discussed comparing rigorous analysis for TM010 mode cylindrical cavity resonator. From the results, it is found that the error of the result for relative dielectric constant became 1.5% or less.