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介绍了传输/反射法测量射频介质参数(复介电常数(εr=ε′r-jε″r=ε′r-jω.ε0)和相对复数磁导率(μr=μ′r-jμ″r))的基本原理;对Nicolson算法中的厚度谐振、多值性和相角跳变等问题进行了深入分析,并提出了改进方案。利用网络分析仪的扫频技术解决了多值性的问题。文章利用矢量网络分析仪和同轴夹具组成的测试系统对聚氯乙烯、聚丙烯、聚甲醛、铁氧体及介电型吸波材料的电磁参数进行了测算,对空气间隙、试样长度和S参数等误差影响因素进行了分析。文章还利用两个系列的同轴夹具(Φ16mm/Φ7mm和Φ7mm/Φ3.05mm)。对几种常用电介质材料进行了测算,对同轴传输线高次模对测试频率范围的影响规律进行了探索。本文为研究电工电子功能材料在高频应用场合下的储能特性和损耗特性奠定了基础。
The transmission / reflection measurements of RF medium parameters (complex permittivity (εr = ε’r-jε “r = ε’r-jω.ε0) and relative complex permeability (μr = μ’r-jμ” r )). The problems of thickness resonance, multivalue and phase transition in Nicolson algorithm are analyzed in depth and some improvements are proposed. Using network analyzer sweep technology to solve the problem of multi-value. In this paper, the electromagnetic parameters of polyvinyl chloride, polypropylene, polyoxymethylene, ferrite and dielectric microwave absorbing materials were measured by a vector network analyzer and a coaxial fixture. The air gap, length of sample and S parameters and other error factors were analyzed. The article also utilizes two series of coaxial fixtures (Φ16mm / Φ7mm and Φ7mm / Φ3.05mm). Several commonly used dielectric materials were calculated and the influence of the high order modes of the coaxial transmission line on the test frequency range was explored. This article lays the foundation for the study of energy storage and loss characteristics of electrical and electronic functional materials in high frequency applications.