In this paper, the continuous polarization continuous tangent stub (CTS) array technology is studied to meet the requirements of satellite communication antenna lightness and radiation aperture reuse. The antenna is designed by orthogonal common aperture, combined with standard waveguide interface bandpass filter and independent power distribution feed network to achieve high polarization isolation. Through the radiation capability of the branches and the array design, the gain characteristic is good and the sidelobe level is reduced. The simulation results show that the return loss of the antenna is less than -10 dB in 18.5~21.2 GHz and 27.5~31 GHz respectively, the average side lobe is less than -12 dB, the port isolation is better than 80 dB, and the gain is 24~27 dBi and 25~27 dBi respectively. The structure is simple, easy to process, low profile height, easy to transport and conformal installation.