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中文摘要：
利用不均匀材料提出了一种折射率正负梯度交替表面，并利用几何光学法和电磁场数值仿真方法对其机理进行了研究与验证，发现其可以操控电磁波的传播：在一定的参数下，其可以将空间中的入射电磁波一直束缚在介质中，或在介质中传播一定距离后再实现电磁波的释放；同时该结构具有宽带、极化无关等特性．利用该结构可引导能流，减小后向散射截面，可用作隐身表面．
英文摘要：
In this paper, we design a kind of positive and negative gradient refractive index alternating surface and discuss its physical mechanism by the geometrical optics method and the numerical simulation of electromagnetic field. This structure can control the propagation of electromagnetic waves by adjusting some parameters such as refractive gradient. Under certain parameters, electromagnetic waves from space can be confined mainly in the media all the time, or are released into the space after propagating a certain distance in the media. This structure is polarization-independent and wide-band. It means that this structure can be used as a stealth surface by reducing the scattering cross section. Finally, the characteristics of the structure are verified by the numerical simulation.
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