Zhang, and B Yang, IEEE Transactions on Antennas and Propagation, 65(12), 6231(2017). Limiti, 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), Paris, France, 2019, pp. Zhang, 2018 International Workshop on Antenna Technology (iWAT), Nanjing, 2018 The antenna is fabricated and tested where good experimental results are noticed compared to the simulation results. The maximum simulated radiation efficiency approaches 96%. The measured gain of the suggested design is enhanced from 10.4 to 12.8 dB at 28 GHz whereas a minor change is noticed at 38 GHz. The two orthogonal antennas’ overall size approaches 34 mm × 55.8 mm × 0.203 mm 3. The suggested structure has been designed on CST Microwave Studio 2019. The envelope correlation coefficient (ECC) is enhanced and the diversity gain (DG) is improved simultaneously. The simulation results have been shown that the measured mutual coupling between the array elements is improved from − 32 to − 45 dB at 28 GHz and from − 22 to − 59 at 38 GHz. To minimize the isolation between the MIMO antennas elements with low complexity and low cost, the antenna elements have been distributed along the z-direction with half-wavelength spacing between elements including Electromagnetic band-gap (EBG) structure in between them. The two elements may be part of two separate MIMO distributions. So, instead of using two enclosures to serve two sectors, only one enclosure is required. The orthogonality of the two antennas allows the use of two antennas on the same substrate within one enclosure to serve two sectors separately. The two antennas are modified compact Vivaldi antennas operating in the two recommended 5G operating bands 28 and 38 GHz with measured impedance bandwidth of 26.5–40 GHz. The proposed antenna consists of two orthogonally polarized antennas. In this paper, a novel design for a 5G base station (BS) antenna is proposed.
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