Table 1.

Performance of the MIMO configuration-I antenna at 28 GHz.

d (mm)	2	4	5	6
$S_{11}$ (dB)	−40.00	−27.77	−44.77	−26.44
$BW$ (GHz)	2.46	3.1	2.89	2.16
$Gain$ (dB)	4.8	5.5	5.2	4.7
$Isolation$ (dB)	<−15	<−15	<−20	<−20