Design and comparative evaluation of antenna array performance using non blind LMS beamforming algorithms

In this paper, 8 element linear antenna array is designed for ISM band at an optimum operating frequency of 2.48 GHz for conventional microstrip patch antenna using CST Microwave Studio. Element spacing has been optimized to 0.5λ to remove mutual coupling which makes focusing of main beam towards unwanted direction and shifts the resonant frequency. Focusing main beam toward look direction and directing nulls in the jamming signals direction are obtained by applying excitation weight vectors produced by different variants of Non-Blind LMS beamforming algorithm. On the basis of these algorithms, antenna array efficiency, normalized array factor and mean square error (MSE) are examined for mobile communication. Side lobe levels, null depth and computational complexity have also been analyzed for comparative analysis.