A Compact Wideband Antenna With Suppressed Mutual Coupling for 5G MIMO Applications

A New Technique of FSS-Based Novel Chair-Shaped Compact MIMO Antenna to Enhance the Gain for Sub-6GHz 5G Applications

“…The parasitic element might be anything, such as a resonator or shorted stubs. Parasitic elements can be used as well to enhance the bandwidth, isolation range, and coupling amount and reduce the size of the MIMO antenna [8], [19], [29].…”

“…However, the systems in [26], [27] and [28] are large, and the tendency to increase the number of ports has led to complex designs. In [29], proposed a new antenna design that uses four parasitic resonators to reduce the size to become (42.5 𝑚𝑚 × 42.5 𝑚𝑚 × 18 𝑚𝑚), lower the Q-factor, and improve the impedance matching. However, the proposed antenna has an isolation of 14 dB with frequency band of (3.38 GHz -5.1 GHz).…”

“…With a relatively 3.8 dBi of low gain and bandwidth of 0.8 GHz (5.0 GHz -5.8 GHz), the isolation achieved in both planes is more than 20 dB. Additionally, some of the designs in [23], [29]- [31] have a narrow bandwidth or are not within the band of the 5G New Radio (NR) spectrums (𝑛77/𝑛78/𝑛79) and Sub6-GHz 5G. Their resonance frequencies are as follows (5.2 GHz -5.65 GHz), (3.38 GHz -5.1 GHz), (2.38 GHz -2.42 GHz) and (5.0 GHz -5.8 GHz).…”

A compact and efficiently designed two-port MIMO antenna for N78/48 5G applications

“…However, in MIMO systems, antenna performance can suffer due to interference caused by the proximity of antenna elements. To address this issue, different isolation methods [ [6] , [7] , [8] ] are employed, including strategies like element decoupling [ [9] , [10] , [11] ], neutralization lines [ 12 ], stubs [ [13] , [14] , [15] , [16] ], defective ground structures (DGS) [ [17] , [18] , [19] ], polarization [ 20 ], electromagnetic band gap (EBG) [ 15 , 21 , 22 ], metamaterials [ 23 , 24 ], techniques, and so on. Manipulating the interaction between antennas involves altering or reducing the flow of surface currents to decrease interference or signal overlap [ 25 , 26 ].…”

“…By employing p-shaped parasitic elements and L-shaped grounded components set apart at a distance of 4.2 mm, we successfully attained 16 dB isolation within the fr-1 frequency range, all within a compact size measuring 38 × 38 mm 2 , as documented [ 13 ]. The N78 band achieves isolation exceeding 20 dB and an impressive 83.5% radiation efficiency through single antennas measuring 40 × 80 mm 2 [ 19 ], owing to their multi port configuration. Positioned diagonally against each other, the antennas reached a reduction of 12 dB [ 28 ] without employing specific isolation techniques.…”