关键词: 法兰材料, 介电系数, 反射系数

Abstract: In recent years, open ended coaxial probe has been widely used in the electromagnetic properties of solid, liquid, biological tissue and other materials. For different materials, the requirements for testing the strength of probes are different. Therefore, it is necessary to add a flange at the end of the probe to enhance its strength. In addition, for liquid samples and biological tissue testing, there are usually different requirements for insertion depth. Based on the radiation model of coaxial open circuit probe and HFSS simulation, this paper analyzes whether the probe terminal with flange or not and the probe insertion depth have little influence on the test accuracy. In the experiment, the coaxial open-circuit probe with or without flange and different insertion depth of the same liquid were tested. In the frequency range of 1-18GHz, the data show that the deviation of the measurement data of the complex permittivity of the sample with or without flange is less than 10%, and the data of different test depths are almost identical.