Abstract: Due to the limited power and loading for the spacecraft, it is necessary for the antenna on the spacecraft to be designed with small size and light weight. A novel broadband dual-polarized antenna is presented in this paper. The bandwidth of designed antenna is increased by using two orthogonal H-shaped slot and adding the parasitic patch. Meanwhile, circular slots are etched both in the radiation patch and the parasitic patch, and the metal reflection rasterizing are introduced to reduce the total weight of the antenna. An eight elements broadband circularly polarized antenna array based on this novel element is designed. The simulation results show that the central frequency is about 433 MHz and the relative bandwidth for the left hand circular polarization and right hand circular polarization are 24.4% and 23.2%, respectively. The designed antenna array has the characteristics of small size, light weight, wide bandwidth and dual polarization.