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With only 16 total elements in a 4x4 configuration you are not likely to see much reduction in SLL. I would study the look into one of the antenna texts on the interaction between aperture distributions and the associated radiation pattens.
Start with Kraus or Silver. Then you can go to more array specific references.
I need to design 8X8 phased array antenna initially i designed 4X4 array antenna with SLL is low .. but i need SLL=20db .. Can u give me the formula for taylor series for rectangular array with SLL=20db please