中文摘要：

变换电磁学是近几年来电磁领域的研究热点。利用坐标变换方法，能够在一定程度上人为调控电磁波的传播路径，结合超材料技术，可以设计出多种具有奇特功能的新颖电磁器件。该文对一系列折线型坐标变换器件做了归纳总结，主要讨论了其中的电磁波集中器；在此基础上从内置隐身飞机模型的散射截面角度进一步研究了电磁波集中器的散射放大功能及其在军事上的应用；最后对该器件参数极值及其归一化分布范围进行了详细的分析。

英文摘要：

Transformation electromagnetics, which has become a hotspot in the research areas recently, provides a new way to manipulate electromagnetic waves with coordinate transformation method. Combined with metamaterials, several new kinds of electromagnetic devices with peculiar functions can now be designed. In this paper, a series of polyline coordinate transformation devices are summarized, among which the electromagnetic wave concentrator is mainly discussed. Based on the theories, the scattering magnifying function and the military applications of electromagnetic wave concentrators are studied through the simulations of embedded stealth aircraft models and the calculations of their scattering cross sections. Each of the parameter extremums of this device and its normalized distributions are analyzed in detail at last.