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In this paper a beam forming and beam steering network of a planar antenna array used for smart antenna system is presented.The antenna array has four antenna elements which are excited by a power divider and a phase shifting network to steer the beam electronically in the desired directions.The antenna array has been designed and simulated using Advanced System Design (ADS) software.The design method proposed in this project can be extended to design m x n antenna array.The main contribution of the proposed technique is its simplicity with a minimal number of antenna elements and its ability to scan the beam in 3-dimmension.