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In this paper, the new multistructure fast computation technique based on the method of moments (MoM) is applied to the optimization of printed structures with a genetic algorithm. Simultaneous analysis of different structures with the new technique leads to important time savings in comparison to an equivalent direct MoM implementation. Several structures with nonintuitive shapes are fabricated and tested. Numerical and technological sensitivities for the different realized structures are compared. The bandwidth optimization of an antenna fed by electromagnetic coupling with a microstrip line is also presented. Excellent agreement between numerical and measured results is observed.