自由空间法测量复合材料复电磁参数

Measurement of complex electromagnetic parameters of composite materials by free-space method

自由空间法可以方便地改变入射电磁波的角度和极化方向,适用于测量复合材料的电磁参数。对自由空间法测量复合材料电磁参数进行了初步研究,探讨了测量结果在计算过程中产生的多值问题,并通过理论分析给出了一些有效的解决方案。用自由空间法测量了4种聚合物复合材料样品在X波段(8.2-12.4 GHz)的复电磁参数,并用波导测量法进行了验证。研究结果表明自由空间法测量复合材料电磁参数具有较高的精确度。

The free-space method is a suitable analysis method for measuring electromagnetic parameters of composite materials, due to its easy changeable incident angle and polarization of electromagnetic waves. This method was used to measure complex electromagnetic parameters of polymers and composites. In order to solve the multivalued problem caused by the calculation process, several effective ways were proposed for the theoretical analysis. The complex permittivity and permeability of four samples of polymer composite materials were measured in the X-band（8.2-12.4 GHz） by using the free-space method. The experimental data are validated with the help of the waveguide technique. The results indicate that the complex electromagnetic parameters of composite materials can be measured exactly by the free-space method.