频率可重构天线在机载、星载等各类平台中具有良好的应用前景，其雷达散射截面积(RCS)减缩对平台整体隐身性能的提高至关重要。本项目致力于电磁超表面的宽带电调技术研究，并探索其在频率可重构天线RCS减缩中的应用。首先从电磁超表面的工作机理出发，建立其等效电路模型，深入分析超表面的吸波和相位调制机理，并将电子控制技术与超表面设计相结合，通过合理加载电子器件，提高超表面的吸波和相位调制工作带宽。其次，研究不同频率下超表面对空间散射场的调控规律，以宽频带内的散射场分布特征为目标，建立多参数目标优化函数，采用高效数值算法优化实现具有指定功能的超表面。最后，将宽带可调电磁超表面应用于频率可重构天线，研究不同频率下天线表面的电场、电流分布规律，探索超表面在天线中的具体加载方式，详细分析其对天线辐射和散射性能的影响，在保证天线辐射性能的同时，实现宽带范围内散射性能的动态实时调控和指定方向RCS的有效减缩。

Frequency reconfigurable antenna (FRA) has good application prospect in airborne, spaceborne and other platforms. Its Radar Cross Section has a significant influence on the stealth performance of the platform. This project focuses on the research of the electromagnetic metasurface (MS) with wide tunning range, and its application on RCS reduction of FRA. Firstly, according to the working mechanism of the MS, the equivalent circuit model of MS is established, then absorption and phase modulation mechanism are analyzed, and the electronic control technology is applied to the design of MS. The absorption and phase modulation bandwidth are broadened by integrating electric components to the MS. Secondly, the regulation law of the scattering field at different frequencies is studied. Multi - parameter target optimization function is established and high - efficiency numerical algorithm is used to optimize MS with specified function. Finally, the wide-band tunable electromagnetic MS is applied to the FRA. The electric field and current distribution of the antenna at different frequencies are studied. Specific loading method of the MS in the antenna is explored, and its influence on the antenna radiation and scattering performance is analyzed in detail. Dynamical control of scattering performance and effective RCS reduction in specific directions are realized in a wide frequency range, while ensuring the radiation performance of the antenna.