Experimental Verification of Broadband mmWave RIS-Aided Communications: Codebook-Based Beam Steering and Indoor Channel Measurements

This paper summarises the design and channel measurements of a wide band Reconfigurable Intelligent Surface RIS operating within the millimeter wave spectrum for 5G and beyond communication. RIS elements are controlled by a p-i-n diode and biased via RF chokes operating within the n257 millimeter wave 5G band. The RIS operates in both vertical and horizontal polarizations. Experiments have been performed to validate the performance of the RIS in both near-field and far-field regions. It has been experimentally demonstrated that the proposed RIS can reflect incident beams towards desired locations with channel gain enhancement of up to 16.3 dB when appropriate phase profiles are applied.