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A study of wideband reflectarray antenna using ring-style resonator elements

A wideband design method for reflectarray antennas with conventional ring-type resonator elements is proposed. It is shown that the one of the causes of the narrow bandwidth is the inadequate attenuation of higher order Floquet modes in the dielectric substrate. As the dielectric substrate thickness increase, the more the higher order modes are attenuated. Therefore, the substrate thickness is the important parameter for wideband reflectarray antennas. The condition of the substrate thickness for wideband characteristic is shown, and the validity is verified by analyzing reflectarray antennas.