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This paper presents a procedure of reducing sidelobe level (SLL) of aperiodic planar array using an improved invasive weed optimization (IWO) algorithm that uses roulette wheel based reproduction. The proposed roulette wheel IWO (RW-IWO) algorithm uses roulette wheel to decide the number of seeds generated by each plant. RW-IWO is applied on standard benchmark functions. Benchmarking shows that RW-IWO gives better performance in terms of mean and standard deviation of optimal solution in comparison to classical IWO and the modified IWO proposed in . Further, in contrary to classical IWO, RW-IWO produces the same number of seeds in each generation and thereby makes coding of RW-IWO much easier compared to coding of classical IWO. When RW-IWO is applied to SLL reduction of 80 element planar array of 9.5λ×4.5λ aperture, we obtained 4.41 dB improvement over the result presented in .