基于非福斯特电路的低频电磁隐身表面

近年来，随着军事技术的不断进步，对微波低频段的隐身技术的研究具有越来越重要的意义。申请者在前期工作中（理论分析和实验验证）发现，通过在开口环阵列加载非福斯特元件可实现宽带负磁导率的等离子超材料。这一概念同样可以应用到电磁隐身表面的设计之中，通过设计相应的单元结构电路，实现在微波低频段对极化不敏感的超薄宽带、宽角度的完美电磁吸波特性。本项目拟对基于非福斯特电路的有源电磁隐身表面展开系统研究。具体包括：研究人工电磁表面的电路解析模型，以加深对其物理本质的理解；研究并设计加载非福斯特元件的电磁隐身表面单元结构以实现对极化不敏感的宽带、宽角度的电磁吸波功能；设计相应的非福斯特电路适应微波低频段的工作要求。本项目的研究具有重要的理论意义和实际意义，在雷达隐身、热辐射仪、红外探测以及热光伏电池等方面具有重要的潜在应用价值。

In recent years, along with the development of military technologies, the study of the stealth technology at microwave low frequencies becomes more and more important.In our previous work, a wideband active magnetic metamaterials consisting of periodic loops with non-Foster loads have been designed，fabricated and tested. These non-Foster loads are realized by a two-port device called negative impedance converter (NIC). This idea can also be applied to the design of wideband and broad-angle active metamaterials absorbers with proper structure cell design. In this project, the active metamaterial absorber based on NIC circuits is going to be studies in further detail, such as studying the analytic model and physical nature of the metasurface; designing the unit cell of the structure with non-Foster loads to achieve an ultra-wideband and broad-angle active metamaterial absorber; designing proper NIC circuits to be adjusted to the frequency requirements. The project is of particular importance to defense technology and national economic, some potential applications include radar invisibility, thermal radiometer, infrared detection, and thermal photovoltaic cells.