多源共波束辐射系统设计

Design of Multisource Co-beam Radiation System

变换电磁学中运用折叠变换可以设计基于负折射材料的完美透镜使原始空间的一个点映射到变换空间中的多个点,它们互为像点。当馈源放置在某一点时其辐射波束会汇聚到其它点,而系统的辐射模式均等效于馈源放置在原始空间馈电点处时的辐射模式。运用这一特性可以构建高效的天线系统,在理论上可使得偏焦的馈源产生与正馈馈源等效的辐射特性从而解决偏馈辐射主波束不在主轴的问题。文中详细设计了一种用于构建辐射系统的三角形结构透镜,计算出了透镜各部分材料参数的表达式,并用一些实例的全波仿真结果验证了理论设计。

Using transformation electromagnetics perfect lens based on negative material can be tailored, by which a point in the original space will map to several points in the folded geometry. Those points are images to each other, which mean that the radiation beams coming from one point will focus at the other points. And the equivalent radiation pattern will be achieved in that way. Using this property, novel high-efficient antenna system can be designed. Such a system can make the offset sources generate beams that are reflected back along the major axis in reflector antennas, a problem that previously has not been satisfactorily solved by any traditional methods. A triangular perfect lens is studied in detail. The constitutive parameters are calculated. Several specific examples and their full-wave simulations are also given to validate the analyses in this paper.