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\begin{tabularx}{\textwidth}{|C||C||C|}
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\multicolumn{3}{|c|}{Table 1: State of The ART Schemes With Intelligent Surfaces}\\
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Scheme & Architecture & Functionality \\
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Intelligent wall & Active frequency selective surfaces with PIN diodes & Fully transparent reflecting surfaces\\
Spatial microwave modulators & Binary phase state tunable meta-surfaces & Shaping complex microwave fields\\
Coding meta-materials & Meta-surfaces with binary elements (0 or $\pi$ phases) & Reconfigurable scattering patterns\\
Programmable meta-surface & Meta-surfaces with PIN diode-equipped cells & Reconfigurable phase, polarization, and scattering\\
Reconfigurable reflect-arrays & Reflect-arrays with tunable (varactor-tuned) resonators & Adjustable reflection phase\\
Large intelligent surface & Active contiguous surface for transmission and reception & Gains compared to massive MIMO \\
Software-controlled hypersurface & Meta-surfaces equipped with IoT gateways & Wave absorption, polarization, and steering\\
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\end{tabularx}
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