Abstract: The electrical despun antenna of circular array of 32 elements around a cylindrical surface for a spin stabilized satellite on the synchronous orbit is suggested in this paper. Each element is formed by a column of four radiating elements in a linear array. By means of switch matrix and digital variable power dividers, five contiguous elements are excited simultaneously to form the beam of covering the globe, and then the scanning about the spin axis of the satellite through the circle is obtained. The angular reference is given by the pulses of the earth sensors that is utilized for synchronization at every satellite turn.Gain ripple less than 1dB and beam steps 1 6° in the course of 0°～360° scanning have been obtained.