超材料宽带低散射技术研究进展

Recent Progress on Metamaterials for Broadband Reduction of Backward Scatterings

电磁吸波材料和外形设计等低散射技术被广泛应用于隐身、电磁屏蔽及无线通信等领域。相比于传统技术途径,超材料低散射技术具有更加灵活的设计和调控能力,因而在带宽拓展、厚度减低等设计要求上具有更好的发展前景。文章介绍了实现宽频带散射缩减的常用方案,并着重介绍了基于多谐振叠加、损耗调节以及漫反射原理的带宽拓展方法,并简要展望了低散射技术的发展趋势。

Low-scattering techniques, e.g., microwave absorber, have been widely used in many applications, such as invisibility, electromagnetic shielding and wireless communications. Compared with conventional ways to realize low scatterings, metamaterials can provide more degrees of freedom in controlling the electromagnetic waves. Therefore, they have advantages and promising prospects in achieving broadband absorbers with thin thickness. Here, we introduce several ways to achieve broadband reduction of backward scatterings including metamaterials with multi-resonances, metamaterials loaded with lossy components and diffusive scatterings, and we also give a brief perspective view of the development of the metamaterial low-scattering techniques.