自由空间法测量电磁材料电磁参数

Measurement of Electromagnetic Parameters of Electromagnetic Materials by Free-Space Method

基于对自由空间法测试材料电磁参量原理的研究，对传统方法进行分析及改进，解决了测试过程中透射系数存在的相位模糊性和由于S11→0时导致的半波谐振问题，最后搭建了测试系统，并使用该系统对常见的微波介质材料在2-18GHz频带下进行了电磁参数的测试。结果表明，由于天线性能特性的限制，此测试系统4-14GHz范围内具有良好的效果。此测试系统具有测试速度快、结构简单、方便准确的定位、测试精度高等特点。

Based on the research on the measurement of electromagnetic parameters, through analyzing and im- proving the traditional method, the phase shift ambiguity problem and the half-wavelength divergence were solved, and finally a set of test system to test the electromagnetic parameters of common materials in the bandwidth from 2 to 18 GHz was built. Due to the restrictions of performance of antenna, the measure result is not accurate between 2 to 4 GHz and 14 to 18 GHz frequency range. This test method has the feature of fast, simple structure, convenient and accurate positioning, high test accuracy and so on.