We propose a transceive element of a phased array antenna for satellite communications systems operating in Ku frequency band. The proposed element based on a magneto-electric dipole antenna. A substrate-integrated waveguide and a cruciform slit of a special shape are used as a feeding element. We aim to drive the circular polarization at two sub-bands simultaneously. We performed electromagnetic simulations and optimization of the single element and applied array factor to evaluate beam steering, directivity and cross-polarization. The antenna elements were optimized using 8 criteria to obtain acceptable S-parameters and ellipticity. As a results, we obtain satisfactory cross-polarization for Rx-band of