In today’s advanced 5G communication systems, there is increasingly high demands for wider bandwidth and higher data rate. MIMO antennas play a pivotal role where multiple antennas are placed in close proximity on a single substrate to achieve high data rate and high gain. However, this increases the effect of mutual coupling. This research presents a dual band 2 × 2 MIMO antenna that operates at 3.5 and 5.2 GHz. With frequency ranges of 3.42–3.57 GHz (BW = 150 MHz) and 5.15 to 5.31 GHz (BW = 160 MHz), respectively, this antenna's return loss is −19.17 dB at 3.5 GHz and −25.6 dB at 5.2 GHz. For the whole frequency range of 3.42–3.57 GHz, the Envelope Correlation Coefficient (ECC) is less than 0.006, and for the frequency range of 5.15–5.31 GHz, it is less than 0.001. The Diversity gain (DG) of the antenna is above 9.99 for both the frequencies and the Total Active Reflective Coefficient (TARC) is also almost stable in both the frequency bands.