| The goal of this thesis was to develop an automatic permittivity measurement system using the Vector Network Analyzer (VNA) at the frequency band of ISM 5.8 GHz, which was based on the cavity perturbation technique. The TE 315 resonant mode in a rectangular cavity was selected so as to have a larger cavity volume to satisfy the requirement of the perturbation theory and to make it easier to introduce the measurement sample.; On the basis of the classical cavity perturbation theory, we proposed a new calibration method of the permittivity measurement. With this calibration method, it is not necessary to measure the volume of the small sample, which not only eliminates the measurement error of the sample volume, but also simplifies the measurement procedure. Moreover, unlike the traditional one-filling-factor calibration method, a new calibration method containing two filling factors was adopted to improve the measurement accuracy of the dielectric loss factor. (Abstract shortened by UMI.)... |
