A generalised probe method is proposed for fast and accurate complex permittivity measurements. The method is based on the simulated reflection coefficients using the finite difference frequency domain method. A database is set up, which consists of the simulated complex reflection coefficients of the unknown material under test. A fast searching algorithm is performed to match the measured reflection coefficients to the reference values in the database, thus the complex permittivity of the liquid can be obtained. An in-house measurement system is developed. The unique feature of this system is that it can be applied to an arbitrarily-shaped probe. Liquid samples are measured and the results are compared with that published in the literature. Good agreements are obtained. These results could be useful for liquid microwave component designs and applications.

中文翻译：

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通用探针法测量液体复介电常数

提出了一种用于快速，准确地复介电常数测量的通用探针方法。该方法基于使用有限差分频域方法的模拟反射系数。建立了一个数据库，该数据库由被测未知材料的模拟复反射系数组成。执行快速搜索算法以将测得的反射系数与数据库中的参考值进行匹配，从而可以获得液体的复介电常数。开发了内部测量系统。该系统的独特之处在于它可以应用于任意形状的探头。测量液体样品，并将结果与​​文献中公布的结果进行比较。获得了良好的协议。