FeSiAl alloy material is a typical soft magnetic material, which have important application potentials in the areas of electromagnetic wave absorption, and thus it is widely used in civilian and military field. Currently, researchers mostly adopts the changes of microstructure and doped components to improve electromagnetic wave absorbing properties of FeSiAl alloy materials. In this paper, a metamaterial designing method is used for the optimal design of a broadband electromagnetic wave absorbing material based on FeSiAl alloy. We investigate the geometrical dimensions and array period on the absorption performance about the FeSiAl metamaterial. The absorption mechanism of FeSiAl metamaterial is discussed through the propagation of electromagnetic field and Smith diagram. We find that the absorption performance can easily be regulated with the macrostructural size. Moreover, we create a broadband FeSiAl metamaterial. The designed FeSiAl metamaterial exhibit a −10 dB absorption bandwidth from 4 GHz to 8 GHz and 10 GHz to 15 GHz, and it is sensitive at large incidence angle, but do not sensitive within $45°$.

FeSiAl合金材料是一种典型的软磁材料，在电磁波吸收领域具有重要的应用潜力，因此被广泛应用于民用和军用领域。目前，研究人员大多采用改变微观结构和掺杂成分来提高FeSiAl合金材料的电磁波吸收性能。本文采用超材料设计方法对基于FeSiAl合金的宽带电磁波吸收材料进行优化设计。我们研究了 FeSiAl 超材料的几何尺寸和阵列周期对吸收性能的影响。通过电磁场的传播和史密斯图讨论了FeSiAl超材料的吸收机制。我们发现吸收性能可以很容易地通过宏观结构尺寸进行调节。此外，我们创造了一种宽带 FeSiAl 超材料。所设计的 FeSiAl 超材料在 4 GHz 至 8 GHz 和 10 GHz 至 15 GHz 范围内具有 -10 dB 的吸收带宽，并且在大入射角下敏感，但在$45°$.