A Dual-band MIMO antenna with novel decoupling structure for 5G mobile/WiFi devices

This paper presents a dual-band Multi Input Multi Output (MIMO) antenna operating at 2.70 – 4.02 GHz and 5.40 – 7.0 GHz frequency bands for 5G mobile/WiFi devices. The proposed MIMO design consists of a 4×4 antenna configuration on FR-4 substrate with dimensions of 67 × 67 × 1.6 mm
³
. A U-shaped slit is etched on the radiator to introduce dual-band feature. The impedance bandwidth is improved by gradually varying the feed line. A novel decoupling technique has been designed and developed on the bottom side of the substrate for achieving high isolation below −24 dB. The highest antenna gain is found to be 6.16 dB and 6.46 dB at 3.10 GHz and 6.60 GHz frequency bands respectively while its radiation efficiency is found to be higher than 90% in the entire operating bands. The diversity performance is tested in terms of Envelope correlation coefficient (ECC), diversity gain (DG), channel capacity loss (CCL) and total active reflection coefficient (TARC) where the measured values of ECC is less than 0.005, the DG is higher than 9.98, channel capacity loss is below 0.4 bits/s/Hz while the TARC is below −10 dB in the entire frequency bands. The simulation results are found to be in good agreement with the experimental results.