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This paper describes amplitude control method for the synthesis of broadside non-uniformly excited and uniformly spaced linear array antenna for generation of multiple side lobe levels using iterative Fast Fourier transform. Compared to other evolutionary methods this technique has higher computational speed. This is the major advantage of this technique i.e. it takes less computation time. This is because of the fact that the core calculations are based on direct and inverse fast Fourier transforms (FFT). An example has been presented with 30 isotropic antennas for producing two different side lobe levels of -50 dB and -30dB.