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In wireless applications the antenna pattern can be shaped in such way that it cancels interfering signals and produces a strong beam towards the wanted signal according to signal direction of arrival (DOA) by placing nulls in the direction of the interfering signals, these nulls also helps to reduce co- channel interference due to less energy being transmitted in unwanted directions. An adaptive particle swarm optimization algorithm (PSO) is proposed to real time pattern shaping. The problem is formulated and solved by means of the proposed algorithm. Two examples are simulated to demonstrate the effectiveness and the design flexibility of adaptive PSO in the framework of electromagnetic synthesis of linear arrays.