Two Port Circularly Polarized MIMO Antenna Design and Investigation for 5G Communication Systems

A compact size wideband circularly polarized (CP) 2-port multiple-input-multiple-output (MIMO) antenna is designed for the fifth generation (5G) region under the sub-6 GHz band. The presented antenna has (≤ − 10 dB) impedance bandwidth of 900 MHz (3.3–4.2 GHz) and has 100% 3-dB axial ratio bandwidth. The antenna covers the potential 5G band ranging from 3.3 to 3.8 GHz having left-handed circular polarization characteristics. To validate performance attributes of the MIMO antenna designed various diversity parameters such as envelope correlation coefficient (ECC), total active reflection coefficient, and diversity gain are calculated. The low envelope correlation coefficient (ECC < 0.10) and the isolation between the antenna elements greater than 15 dB justify the acceptance of the proposed design as a MIMO antenna. The proposed design exhibits good agreement between the simulated and the measured results.