A study on the impact of the phase errors distribution on the performances of the phased array systems has been produced using a complete and behavioral model for radiation-pattern characteristics. The study has shown how the phase errors distribution actually affects the performances demonstrating that the rms phase error is a valuable figure of merit of phased array systems but it is not sufficient to completely describe the behavior of a real system. The used model has many input parameters and it has a lot of features, such as parameter simulations with results analysis, unconventional two-dimensional color graph representation capability in order to show more clearly the results. The results of the study demonstrating the previous considerations have been reported.