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This paper reports a 4 × 4 and 8 × 8 MIMO antenna configuration on FR4 substrate occupying the area of 1.43 λo  × 1.43 λo  mm 2  ( f  = 3.58 GHz) and 2.14 λo  × 2.14 λo  mm 2  ( f  = 3.50 GHz). The proposed design is exclusively developed for 5G: n77/n78 wireless band applications. The MIMO antenna comprises of Lotus-shaped radiating element with DGS (defected-ground-structure) in-ground and the addition of slits providing boresight radiation. All the radiating elements are placed orthogonally in a 4 × 4 configuration while pairs of antennas are also placed in the same fashion for 8 × 8 MIMO antenna configuration. The high isolation of more than 16 dB is achieved by using a novel decoupling structure in the ground. Also, the MIMO antenna are characterized with diversity performance including ECC, DG, TARC, CCL and MEG achieving permissible values of &lt;0.005, ∼10 dB, &lt;0 dB, &lt;0.10b/s/Hz and ∼ −3 dB respectively. The peak gain corresponds to 4.51 and 5.02 dBi with radiation efficiency of more than 80% for 4 × 4/8 × 8 MIMO antenna configuration. The proposed antenna also offers desired 2D radiation patterns in principal planes.

Lotus flower-shaped 4/8-element MIMO antenna for 5G n77 and n78 band applications