同轴探头法测量片状介质材料的微波介电常数

提出了一种可用于测量片状介质材料微波复介电常数的同轴探头技术，该技术将同轴探头紧贴有导电衬底的片状介质，通过测量探头终端的矢量反射系数来确定介质的微波复介电常数。详细介绍了所采用的理论模型和测量系统。测量了一些常见介质材料的介电常数，测量值与理论值基本吻合。文章的同轴探头技术不仅可用于测量厚度较小的片状介质，而且可用测量样品量有限的液体。

Microwave Permittivity Measurements of Dielectric Sheets Using Coaxial Probe Technique

This paper proposes a coaxial probe technique for measuring microwave complex permittivity of dielectric sheets.The dielectric sheets,backed by an electric conductor,are placed flush with the probe.The values of the complex permittivity of the dielectric sheets are determined from the coaxial aperture reflection coefficient,which is measured by a vector network analyzer.Both theoretical model and meaxurement system are described in great detail.To validate this technique,a series of experimental measurements are carried out on several familiar dielectric materials.The measured data are found to be in good agreement with the known data.This technique not only can be used to measure the permittivity of dielectric sheets,but also can be used to determine the microwave dielectric properties of quantity limited liquids.