应用模匹配法和空间Floquet理论,对金属光栅的散射特性进行了详尽分析,并且得到了矩形光栅圆极化器的尺寸.然后,对光栅结构进行了优化,得到了双U型金属光栅圆极化器,其轴比1.2范围内的带宽是矩形光栅带宽的3倍,功率容量为矩形光栅的15倍.最后,在CST软件中建立模型,仿真结果显示,中心频率上轴比为1.07,很好地实现了右旋极化转变.%Scattering characteristics of reflex metal grating are analyzed according to mode-matching method and space Flo-quet mode theory. Rectangular metal gratings are designed and optimized. The optimized double U-shaped gratings' bandwidth is three times that of the rectangular ones, and the power capacity is 15 times. The CST simulation results show that the axial ratio of the circular polarization devices is 1. 07 at the center frequency of 94 GHz, and right-handed circular polarization is realized.
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