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This paper presents a spiraphase-type reflectarray based on reactively loaded ring slot resonators. The infinite array approach was used to optimize the unit cell geometry to obtain high aperture efficiencies and low cross-polarization levels at large reflection elevation angles $\theta_0$. The results of the optimization were used to design four 367-element reflectarrays for $\theta_0$ of 0°, 20°,...
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