# Compact Sub 6 GHz Slot Multiantenna System for 5G Laptops
## 7 Conclusions
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Ref.**} & \multirow{2}{*}{\begin{tabular}{c} **Single Antenna Size** \\ **(Width \(\times\) Length) (mm)** \\ \end{tabular} } & \begin{tabular}{c} **Operating** \\ **Bands** \\ **(MHz)** \\ \end{tabular} & \begin{tabular}{c} **Spacing between** \\ **Two-Antenna** \\ **Units (mm)** \\ \end{tabular} & \begin{tabular}{c} **Isolation** \\ **(dB)** \\ \end{tabular} & **Eff.** & **ECC** & \
\begin{tabular}{c} **Antenna** \\ **Structure** \\ \end{tabular} &
\begin{tabular}{c} **More than** \\ **Six-Antenna** \\ **System** \\ \end{tabular} \\ \hline
[10] & \
\begin{tabular}{c} 3.8 \(\times\) 6.78 \\ (0.06 \(\times\) 0.11 \(\lambda\) @ 4.70 GHz) \\ \end{tabular} & 4400-5000 &
\begin{tabular}{c} \(\geq\) 31 \\ (0.49 \(\lambda\) @ 4.70 GHz) \\ \end{tabular} & \(\geq\)22 & \(\geq\)50\% & \(\leq\)0.049 & opened-slot & achieved \\ \hline
[11] & \
\begin{tabular}{c} 5.6 \(\times\) 17.8 \\ (0.07 \(\lambda\)\(\times\) 0.21 \(\lambda\) @ 3.53 GHz) \\ \end{tabular} & 3400-3650 &
\begin{tabular}{c} \(\geq\) 19.7 \\ (0.23 \(\lambda\) @ 3.53 GHz) \\ \end{tabular} & \(\geq\)21 & \(\geq\)34\% & \(\leq\)0.01 & opened-slot & achieved \\ \hline
[12] & \
\begin{tabular}{c} 3 \(\times\) 37 \\ (0.02 \(\lambda\)\(\times\) 0.30 \(\lambda\) @ 2.45 GHz) \\ \end{tabular} & 2400-2500 &
\begin{tabular}{c} \(\geq\) -10 \\ 5200-5450 \\ \end{tabular} & \(\geq\)15 & \(\geq\)60\% & \(\leq\)0.08 & closed-slot & N/A \\ \hline
[13] & \
\begin{tabular}{c} 20 \(\times\) 20 \\ (0.24 \(\lambda\) @ 3.58 GHz) \\ \end{tabular} & 3350-3800 &
\begin{tabular}{c} \(\geq\)35 \\ (0.42 \(\lambda\) @ 3.580 GHz) \\ \end{tabular} & \(\geq\)15 & \(\geq\)90\% & \(\leq\)0.01 & closed-slot & achieved \\ \hline
[16] &
\begin{tabular}{c} 1 \(\times\) 16 \(\times\) 4.2 \\ (0.01 \(\lambda\)\(\times\) 0.18 \(\lambda\) @ 0.05 \(\lambda\) @ 3.45 GHz) \\ \end{tabular} & 3300-6000 & only one two-antenna unit & \(\geq\)10 & \(\geq\)56\% & \(\leq\)0.1 & inverted-F & N/A \\ \hline
[19] &
\begin{tabular}{c} 4 \(\times\) 9.5 \\ (0.05 \(\lambda\)\(\times\) 0.11 \(\lambda\) @ 3.60 GHz) \\ \end{tabular} & 3400-3800 & only one two-antenna unit & \(\geq\)17.5 & \(\geq\)50\% & \(\leq\)0.05 & inverted-F & N/A \\ \hline
[23] &
\begin{tabular}{c} 12.3 \(\times\) 22.52 \\ (0.13 \(\lambda\)\(\times\) 0.27 \(\lambda\) @ 3.20 GHz) \\ \end{tabular} & 2800-3600 & only one two-antenna unit & \(\geq\)35 & N/A & \(\leq\)0.02 & patch & N/A \\ \hline
[24] &
\begin{tabular}{c} 50 \(\times\) 50 \(\times\) 1.6 \\ (0.43 \(\lambda\)\(\times\) 0.43 \(\times\) 0.01 \(\lambda\) @ 2.58 GHz) \\ \end{tabular} & 2500-6025 & only one two-antenna unit & \(\geq\)19.3 & \(\geq\)60\% & \(\leq\)0.03 & patch & N/A \\ \hline
[25] &
\begin{tabular}{c} 4 \(\times\) 9 \\ (0.05 \(\lambda\)\(\times\) 0.11 \(\lambda\) @ 3.50 GHz) \\ \end{tabular} & 3400-3600 & only one two-antenna unit & \(\geq\)12 & \(\geq\)38\% & N/A & monopole & achieved \\ \hline
[26] & \
\begin{tabular}{c} 3.5 \(\times\) 9 \(\times\) 5 \\ (0.05 \(\lambda\)\(\times\) 0.11 \(\lambda\) @ 0.06 \(\lambda\) @ 3.60 GHz) \\ \end{tabular} & 4750-5130 &
\begin{tabular}{c} \(\geq\)21 \\ (0.25 \(\lambda\) @ 3.60 GHz) \\ \end{tabular} & \(\geq\)14.5 & \(\geq\)60\% & \(\leq\)0.08 & inverted-F & achieved \\ \hline
[27] & \begin{tabular}{c} 4 \(\times\) 9 \\ (0.05 \(\lambda\)\(\times\) 0.11 \(\lambda\) @ 3.50 GHz) \\ \end{tabular} & 3600-3900 & \begin{tabular}{c} \(\geq\)22 \\ 5500-6300 \\ \end{tabular} & \(\geq\)22 & \(\geq\)42\% & \(\leq\)0.035 & monopole & achieved \\ \hline this work & \
\begin{tabular}{c} 3 \(\times\) 32 \\ (0.03 \(\lambda\)\(\times\) 0.37 \(\lambda\) @ 3.45 GHz) \\ \end{tabular} & 4800-5000 &
\begin{tabular}{c} \(\geq\)300-3600 \\ (0.06 \(\lambda\) @ 3.45 GHz) \\ \end{tabular} & \(\geq\)10 & \(\geq\)47\% & \(\leq\)0.2 & closed-slot & achieved \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Performance comparison of MIMO antenna systems.