Broadband dual-polarization dual-coverage reflectarray antenna

A broadband dual-polarization dual-coverage reflectarray has been designed for space applications. The coverages for horizontal and vertical polarizations are 28 dBi in China and 33.5 dBi in east of China, respectively. The reflectarray consists of three stacked layers of printed arrays with rectangular patches. To overcome the frequency band limitation of the large reflectarray, the x or y dimensions of the stacked patches are optimized independently to match the required phase distribution for each coverage in a given frequency band. An approach for determining the optimal position of the feed is presented to minimize the differential spatial phase delay for the large reflectarray. The results show that the radiation patterns fulfill the coverage requirements in a 10% bandwidth (11.85-13.15 GHz).