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根据广义Snell反射定律,相位梯度超表面可在其表面形成额外的平行波矢分量,从而对电磁波的反射进行调控。如果构成反射超表面单元的相位差按照抛物面分布,那么就可以实现对垂直入射电磁波的聚焦;相反,在超表面焦点处放置辐射球面波的馈源,球面波经超表面反射可以得到平面波,从而提高馈源增益。本文基于有相位梯度的单元,设计了由13×13个单元构成的二维反射相位梯度超表面,并在其焦点处放置贴片天线,构成反射面天线。仿真和测试结果都表明,贴片天线辐射的球面波经超表面反射后得到了平面波,天线的增益达到20 d B,比贴片天线提高了11.7 d B。
According to the generalized Snell law of reflection, the phase gradient superficial surface can form additional parallel wave vector components on its surface to control the reflection of electromagnetic wave. If the phases of the reflection superficial elements are distributed parabolically, then the vertical incident electromagnetic wave can be focused. On the contrary, the feed of the radial spherical wave can be placed at the focal point of the superficial surface, and the spherical wave can be obtained as plane wave by superficial reflection Increase feed gain. In this paper, a two-dimensional reflection phase gradient superficial surface composed of 13 × 13 units is designed based on the unit with phase gradient, and a patch antenna is placed at the focal point to form a reflector antenna. The simulation and test results show that the spherical wave radiated by the patch antenna has a plane wave after being reflected by the superficial surface. The gain of the antenna reaches 20 d B, which is 11.7 d higher than that of the patch antenna.