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Millimeter-wave (mmWave) communications is considered as a key enablertowards the realization of next-generation wireless networks, due to theabundance of available spectrum at mmWave frequencies. However, mmWave suffersfrom high free-space path-loss and poor scattering resulting in mostlyline-of-sight (LoS) channels which result in a lack of coverage. Reconfigurableintelligent surfaces (RIS), as a new paradigm, have the potential to fill thecoverage holes by shaping the wireless channel. In this paper, we propose anovel approach for designing RIS with elements arranged in a uniform planararray (UPA) structure. In what we refer to as multi-beamforming, We propose anddesign RIS such that the reflected beam comprises multiple disjoint lobes.Moreover, the beams have optimized gain within the desired angular coveragewith fairly sharp edges avoiding power leakage to other regions. We provide aclosed-form low-complexity solution for the multi-beamforming design. Weconfirm our theoretical results by numerical analysis.

Shaping mmWave Wireless Channel via Multi-Beam Design using Reconfigurable Intelligent Surfaces