Our aim is to develop a microwave (X-band) antenna whose radiation pattern is electronically controlled. The radiation pattern of regular antennas is determined by the Fourier-transform of the phase and amplitude distribution on the antenna aperture. This radiation pattern is mechanically fixed so its alteration is impossible. Therefore let us construct an antenna system, which contains several antenna elements. All elements are actuated by separate transmitters; let us control the amplitude and the phase of the supplying currents of the antenna elements. This way, we are able to control the radiation pattern of the antenna system. The control is computerized so that there is a possibility to change the radiation pattern several times in a second.