基于分形人工电磁材料的阵列天线RCS缩减技术研究

项目名称： 基于分形人工电磁材料的阵列天线RCS缩减技术研究

项目编号： No.61271100

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 曹祥玉

作者单位： 中国人民解放军空军工程大学

项目金额： 80万元

中文摘要： 针对阵列天线的带内同极化隐身需求，从吸波与相位对消两个角度，对基于分形人工电磁材料的阵列天线隐身技术进行研究。建立阵列天线的多端口网络模型，采用波函数展开法分析不同负载阻抗对阵列各散射模式的影响规律，形成完备的阵列天线散射理论；基于分形电动力学理论，从Koch、Sierpinski、Hilbert等分形方式入手，对人工电磁材料单元进行分形化设计，实现小型化、宽频带目的；提出采用分形组阵的方式对人工电磁材料与阵列天线进行一体化设计，通过对单元个数，分形维度，排列方式的优化，从材料吸波与阵因子方向图优化的角度实现天线阵RCS减缩；提出基于分形布阵的相位对消屏设计方法，并将该方法推广为更具一般性的非均匀相位分布屏设计。采用泰勒综合法和粒子群优化算法，通过对反射相位分布的优化，将阵列散射主瓣偏移至任意低威胁方向，实现天线阵高威胁方向RCS减缩。

中文关键词： 分形；人工电磁材料；雷达散射截面积；阵列天线；吸波特性

英文摘要： Aiming at the in-band polarization stealth requirement of antenna array, the stealth techniques of antenna array based on fractal metamaterial have been studied in terms of two approaches: the principle of absorber and the principle of passive phase cancellation. The multi-port network model of antenna array has been established, and the effects of different loaded impedance on different scattering modes of antenna array was analyzed, leading to the establishment of a theory of the scattering fields of antenna array. Based on the theories of fractal electrodynamics, broadband and miniaturized fractal metamaterial unit cells were designed according to several fractal structures such as Koch, Sierpinski, Hilbert. Using the method of fractal array, a method of design incorporating both metamaterial and antenna array has been presented. By optimizing the number of units, fractal dimensions and array distribution, the radar cross section(RCS) reduction of antenna array was realized in terms of material absorption and the pattern optimization of array factors. The method was based on the passive phase cancellation screen of the fractal array, which was further extended to be used with the generalized absorbing screen of non-uniformity phase distribution. Through optimizing the distribution of reflection phase using th

英文关键词： fractal；metamaterials；radar cross section；antenna array；absorbing property