Abstract: A double circular polarization broadband antenna is designed, and a small array is realized on this basis. The element antenna is a stacked microstrip antenna with a ring of metal bands and metal columns around the radiation patch to expand the beam width. In addition, in order to meet the requirements of double circular polarization and to expand the antenna bandwidth, the antenna is fed by a ring bridge. The 10 dB impedance bandwidth is 26.9% (1.8 GHz～2.36 GHz), the 3 dB axial ratio bandwidth is 19.3% (1.92～2.33 GHz), and the 3 dB beam width is greater than 110°. A non-regular five elements array is investigated. The test results show that the synthetic gain is higher than 11.5dBi, and the ±55° scanning gain is higher than 9dBi. The simulation and experimental results are consistent, which is the foundation of broadband satellite communication application.