Scale-changing technique has been successfully used for the modeling of a passive infinite reflectarray. The obtained results are successfully validated using HFSS simulation results. This technique has proven to be more time-efficient as compared to the conventional full-wave techniques especially for the geometries where greater number of scales can be defined e.g. in case of frequency selective surfaces or structures which utilize active MEMS. The scale-changing technique is intended to be used for the finite array problems in the near future to model the mutual coupling between the cells.