高增益多波束天线广泛应用于卫星通信、卫星导航等系统中。多波束反射面天线利用位于焦平面上的多个馈源对反射面照射，从而产生多个波束，它能够实现口径的共享，这对于节省卫星载荷有非常重要的现实意义，在卫星通信中获得广泛应用。但传统的馈源方式很难满足现有系统对馈源提出的高口径效率，低剖面、低载荷要求。本项目提出了小口径条件下高性能低剖面圆极化Fabry-Perot谐振天线阵列并将其应用于多波束反射面的馈源研究。着重研究小口径条件下提高口径效率、改善天线的辐射特性、拓展增益带宽的新方案，有效降低天线剖面高度，提出适合于工程实际馈源结构，利用位于焦平面上的多个馈源对反射面照射，从而产生多波束，最终实现高增益多波束反射面天线的一体化设计，有效解决波束交叠区域增益下降及漏失效率的问题，降低多波束系统设计的复杂度节省卫星载荷，在上述领域形成具有自主知识产权的关键技术

High-gain multibeam antenna have been widely used in satellite communication, satellite navigation systems. Multibeam reflector antennas composted of multifeeds located in focus plane illuminating the reflector are commonly used in satellite communication due to its flexible and simple realization. But traditional feeding ways such as horn array are difficult to meet the requirements of high aperture efficiency, low profile, low payload for feed proposed by satellite system. High performance low profile circularly polarized Fabry-Perot resonator antenna under small aperture condition proposed in this project is particular suitable for acting as feed of multibeam reflector antenna.By combining with the equivalent model proposed by the applicant plus the other analytical models and relating the research of Metasurface with antennas, we will investigate the key factors in influencing the gain bandwidth of antenna, the new scheme to improving the gain bandwidth and efficient method to decreasing the profile and improving the radiation performance of antenna. At last, we will also achieve the integrated design of high-gain simple- structure multibeam reflector antenna with actual engineering applications. So the successful implementation of this project will be to decrease the complexity of satellite system and improve the satellite payload, which will also provide an important theoretical basis for forming the key techniques with independent intellectual property rights in the above areas.