Nondestructive Electrical Characterization of Materials at Microwave Frequencies

本研究旨在开发合适的测量方法 用于无损检测的方法和相关计算机软件 表征材料在UHF和 微波频率 将使用开放式同轴线， 进行电容率测量。 一个定常变分公式 对于地平面上同轴开口的孔径阻抗， 将用于将其输入反射系数与 样品介质的电特性。 首先，大 将考虑样本媒体。 薄介电片材将 以后再考虑。 傅立叶变换方法将用于 解决了薄介质片材料的情况， 将考虑表面波激励的影响。

This research is directed towards developing suitable measurement methods and related computer software for nondestructive characterization of the complex permittivity of materials at UHF and microwave frequencies. An open-ended coaxial line will be used to make permittivity measurements. A stationary variational formulation for the aperture impedance of the coaxial opening on a ground plane will be used to relate its input reflection coefficient with the electrical properties of the sample medium. To start with, large sample media will be considered. Thin dielectric sheet materials will be considered later. The fourier transform method will be used to solve the case of thin dielectric sheet materials, and possibilities of the surface wave excitation will be considered.