A Novel Tri-band MIMO Antenna for 5G Wireless Communication

In this research article, a novel tri-band MIMO antenna is proposed; the resonating bands of the antennas are X-band, K-band, and Ka-band. With a dielectric constant of 2.2, Roger RT5880 is utilized as a substrate while designing the antenna. The total aspect of the introduced single-element antenna is $10 \times 12 \times 0.254 \mathrm{~mm} 3$, and the $4 \times 4$ MIMO antenna is $22 \times 22 \times 0.254 \mathrm{~mm} 3$. The resonating frequency of a single element and $4 \times 4$ MIMO antenna is within the X-band, K-band, and Ka-band. Maximum gain obtains by the simulation of single element antenna is $2.25 \mathrm{~dB}, 4.9 \mathrm{~dB}$, and 3.77 dB at the frequencies of 9.85 $\mathrm{GHz}, 28 \mathrm{GHz}$, and 38.53 GHz, respectively. On the other hand, for the MIMO antenna, the recorded gain at 10.491 GHz is 4.3 dB, at 28.79 GHz is 5.06 dB, and at 38.89 GHz is 4.3 dB. Both antennas provide high efficiency, 90 and above. The performance parameters of the MIMO antenna, like the envelope correlation coefficient (ECC), Mean effective gain (MEG), and Diversity gain (DG), are also calculated for performance analysis, all of which provide satisfactory results.