基于异常反射型超表面的天线反射面设计

Accurate artificial manipulation of electromagnetic wave propagation is needed in many practical applications, while the traditional optical devices and artificial electromagnetic media adopt 3D structures which can be hardly integrated with other devices. By adjusting the transmission path to accumulate phase differences, a new way to control electromagnetic wave propagation and Generalized Snell's law has been proposed. On this basis,to realize electromagnetic wave abnormal reflection in microwave region,the reflection-type metasurface based on phase gradient is adopted. Reflectors based on metasurface can efficiently convert circularly polarized waves into cross-polarized waves. According to the generalized reflection law and the modified phase difference at oblique incidence, the reflection EM wave by antenna reflector can be manually controlled in the X-band. The accuracy of the design method is verified by full-wave simulation analysis, which provides an idea for the metasurface as the antenna reflector.