\begin{tabular}{ |p{4.5cm}|p{6cm}|p{4.5cm}| }
\hline
\multicolumn{3}{|c|}{Table X: Initial Examples of Communications Through Intelligent Surface} \\
\hline
Scheme & Architecture & Functionality \\
\hline
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\\
\hline
\end{tabular}\\
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Imran
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tableenvironment and then adding the\centeringcommand? – Imran Dec 06 '21 at 15:40