Abstract
This article presents a novel ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna array for 5G millimeter-wave applications. The edge-to-edge distance between the radiation patches is 5.8 mm or 0.54 λ at 28 GHz. The proposed antenna gives wide impedance bandwidth from 20 GHz to more than 40 GHz covering the two recommended 5G operating bands: 28 and 38 GHz. The proposed antenna consists of two-planner parallel antennas allowing the use of two antennas on the same substrate within one enclosure to serve two sectors separately. The antenna is designed on a Rogers RT5880 substrate with a compact size of 32.9 × 29.2 × 0.254 mm3. In the proposed MIMO antenna, the isolation reduction is achieved by combining a pair of neutralization lines (NL) with five complementary square ring resonator (CSRR) structures to minimize the mutual coupling between the antenna elements. The isolation enhancement between MIMO elements is more than 30 dB. The metamaterial cells and NL result in more than 2 dBi gain enhancement. A maximum realized gain of 13.5 dBi is achieved at 28 GHz. The envelope correlation coefficient (ECC), diversity gain (DG), and total active reflection coefficient (TARC) are improved; furthermore, mean effective gain (MEG) is calculated. The proposed antenna is designed and simulated on CST Microwave Studio 2019. The fabricated prototypes of the MIMO array show very good agreement with simulated results.
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The experimental data referenced to in this manuscript are available upon request to the corresponding author, Rania H. Elabd.
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Elabd, R.H., Abdullah, H.H. A High Isolation UWB MIMO Vivaldi Antenna Based on CSRR-NL for Contemporary 5G Millimeter-Wave Applications. J Infrared Milli Terahz Waves 43, 920–941 (2022). https://doi.org/10.1007/s10762-022-00894-y
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DOI: https://doi.org/10.1007/s10762-022-00894-y