双频宽带大型微带反射阵天线设计

Design on Double Frequency and Wide Band Microstrip Reflectarray Antenna

微带反射阵天线在性能上最主要的缺陷就是窄带,一般情况下其带宽小于5%,对电大口径短焦距馈电时更窄。本文设计并制作出一种由L波段和C波段两个反射面天线组成的6m×2m薄膜双频微带反射阵天线,两个频段的天线共用一层膜面。对该天线的电性能进行了测试,测试结果表明:该天线两个频段的相对带宽均大于10%(副瓣电平≤-18dB)。该天线具有折叠、可展开的结构特征,可以在卫星或航天器上广泛应用。

The main limitation to microstrip reflectarray antenna performance is the narrow bandwidth. It is generally lower than 5 percent and even less for large microstrip reflectarray antenna. In this paper, the double frequency and wideband microstrip reflectarray antenna was designed, fabricated and tested, which comprised of an L waveband reflecting surface antenna and a C waveband reflecting surface antenna in a same plane. Testing results indicate that the frequency bandwidth can reach 10% for sidelobe level less than or equal to -18dB. The microstrip reflectarray antenna has the characteristics of easily folded and portability, which will be widely applied in satellite or spacecraft.