基于人工电磁媒质(Metamaterial,MTM)减缩天线雷达截面积(Radar Cross Section,RCS)是天线隐身技术的重要实现途径之一。共享孔径技术是一种新的相控阵天线技术，利用此技术设计MTM以实现天线RCS减缩尚未见报道。本项目拟开展基于共享孔径MTM的新型天线隐身技术研究。从MTM的吸波、同相反射等特性出发，利用共享孔径技术，建立MTM结构模型，采用阵列天线理论分析其散射特性，简化分析计算，研究实现低RCS宽带MTM的方法和途径。采用分形技术和多调谐电路理论，从"场"和"路"的角度分析设计小型化、宽频带子孔径MTM单元。采用共享孔径技术，通过交错稀疏布阵方式，利用遗传算法、粒子群算法和差集算法等对媒质的反射相位、幅度、阵元位置进行优化，实现具有相位相消和完美吸波特性的共享孔径MTM。将共享孔径MTM与天线进行一体化设计，实现天线宽频带、特定高威胁方向的RCS减缩。

Radar cross section(RCS) reduction of antennas based on metamaterial(MTM) has been one of the most important stealth techniques for antennas. Shared aperture, a new technology in phased-array antennas, hasn't been applied to the design of such metamaterial utilized in antenna RCS reduction. This project is aimed at developing a novel antenna stealth technique utilizing shared-aperture MTM. Based on the absorbing and reflection properties of MTM, a computational model can be established using the shared-aperture techniques.By applying array-antenna theories to the analysis of scattering properties, the scattering field analysis and computation can be simplified. With the aspects of field and circuits in consideration, fractal electrodynamics and multi-tuner circuit theories can be utilized to design broadband and miniaturized subarrays of metamaterial. Through the shared-aperture technology, using the Interleaved Sparse Arrays (ISA) method, genetic algorithm, swarm optimization method and difference sets method, the reflection phase, reflection amplitude and location of subarrays can be optimized to abtain shared-aperture metamaterial with passive cancellation and perfect absorber function. As a result, an integrated design considering both shared-aperture metamaterial and the antenna can be realized to reduce antenna RCS in high-threat directions and broadbandly absorb any radar electromagnetic wave of threat.