Digital Beamforming - Linear and Planar Array

Abstract

Our aim is to develop a microwave antenna whose radiation pattern is electronically controlled. The radiation pattern of an antenna is determined by the Fourier-transform of the complex illumination function on the antenna aperture. This radiation pattern is mechanically fixed so its alteration is impossible. Therefore we construct an antenna system of several antenna elements. All elements are actuated by separate transmitters; we 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 quickly. The novelty of our antenna system is the realization in X and UMTS band.