Twelve element dual-band mimo antenna for 5g smartphones

A twelve element dual band multiple-input multiple-output (MIMO) antenna for a smartphone, comprising:

• a substrate having a top side, a bottom side, a first side wall, a second side wall opposite the first side wall, a third side wall perpendicular to the first side wall and a fourth side wall opposite to the third side wall;
• twelve single element dual band antennas, wherein four of the single element dual band antennas are spaced along an outer surface of the first side wall, four of the single element dual band antennas are spaced along an outer surface of the second side wall, two of the single element dual band antennas are spaced along an outer surface of the third side wall and two of the single element dual band antennas are spaced along an outer surface of the fourth side wall, wherein each single element dual band antenna includes a meandered slot line having a first arm and a second arm, wherein the first arm is separated from the second arm by a slit;
• twelve T-shaped feed structures, including:
• a first set of four of the T-shaped feed structures located on an inner surface of the first side wall, wherein each of the first set of four T-shaped feed structures is located directly behind and centered with a single element dual band antenna located on the outer surface of the first side wall,
• a second set of four of the T-shaped feed structures located on an inner surface of the second side wall, wherein each of the second set of four T-shaped feed structures is located directly behind and centered with a single element dual band antenna located on the outer surface of the second side wall,
• a third set of two T-shaped feed structures located on an inner surface of the third side wall, wherein each of the third set of two T-shaped feed structures is located directly behind and centered with a single element dual band antenna located on the outer surface of the third side wall,
• a fourth set of two T-shaped feed structures located on an inner surface of the fourth side wall, wherein each of the fourth set of two T-shaped feed structures is located directly behind and centered with a single element dual band antenna located on the outer surface of the fourth side wall,
• wherein each T-shaped feed structure is connected through to a feed port located on the bottom side of the substrate;
• a ground plane located on the bottom side of the substrate, wherein the first arm and the second arm are connected to the ground plane;
• and
• each antenna of the twelve element dual band MIMO antenna is configured to radiate from the first arm at a frequency of about 2.4 GHz and to radiate from the second arm at a frequency of about 3.5 GHz in response to an electrical signal applied to its respective feed port.