RIS elements grouped by Fresnel zone are given equal phase shifts, making the wideband channel a Fourier transform of zone intensities and enabling near-optimal beamforming without true-time-delay hardware.
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Near-Field Wideband Beamforming for RIS Based on Fresnel Zone
RIS elements grouped by Fresnel zone are given equal phase shifts, making the wideband channel a Fourier transform of zone intensities and enabling near-optimal beamforming without true-time-delay hardware.