Gain and isolation enhancement of a wideband MIMO antenna using metasurface for 5G sub-6 GHz communication systems

Abstract

This work proposes a compact metasurface (MS)-integrated wideband multiple-input multiple-output (MIMO) antenna for fifth generation (5G) sub-6 GHz wireless communication systems. The perceptible novelty of the proposed MIMO system is its wide operating bandwidth, high gain, lower interelement gap, and excellent isolation within the MIMO components. The radiating patch of the antenna is truncated diagonally with a partially ground plane, and a metasurface has been employed for enhancing the antenna performance. The suggested MS integrated single antenna prototype has a miniature dimension of 0.58λ × 0.58λ × 0.02λ. The simulated and measured findings demonstrate a wideband characteristic starting from 3.11 to 7.67 GHz including a high realized gain of 8 dBi. The four-element MIMO system has been designed by rendering each single antenna orthogonally to one another while retaining compact size and wideband properties between 3.2 and 7.6 GHz. The suggested MIMO prototype has been designed and fabricated on a low loss Rogers RT5880 substrate with a miniature dimension of 1.05λ × 1.05λ × 0.02λ and its performance is evaluated using a suggested 10 × 10 array of a square enclosed circular split ring resonators within the same substrate material. The inclusion of the proposed metasurface with a backplane significantly reduces antenna backward radiation and manipulates the electromagnetic field, thus improving the bandwidth, gain and isolation of MIMO components. The suggested 4-port MIMO antenna offers a high realized gain of 8.3 dBi compared to existing MIMO antennas with an excellent average total efficiency of 82% in the 5G sub-6 GHz spectrum and is in good accordance with measured results. Furthermore, the developed MIMO antenna exhibits outstanding diversity characteristics in respect of envelope correlation coefficient (ECC) less than 0.004, diversity gain (DG) close to 10 dB (> 9.98 dB) and high isolation between MIMO components (> 15.5 dB). Therefore, the proposed MS-inspired MIMO antenna substantiates its applicability for 5G sub-6 GHz communication networks.

A four-port wideband filtering monopole MIMO array for sub-6 GHz 5G communications

“…The proposed four-port MIMO shows isolation >18.5 dB which is larger compared to the works reported in [6, 11, 14, 15, 16, 24, 25]. This is achieved by introducing a pair of interconnected inverted L-stubs of asymmetric lengths.…”

“…It shows an average out-of-band rejection level of 15 dB in the frequency ranging from 6 to 20 GHz, thereby enhancing the stopband behavior of the antenna resulting in a high signal-to-noise ratio. The proposed four-port MIMO shows isolation >18.5 dB which is larger compared to the works reported in [6, 11, 14, 15, 16, 24, 25]. This is achieved by introducing a pair of interconnected inverted L-stubs of asymmetric lengths. The center-to-center spacing between the adjacent elements in the four-port MIMO antenna is reduced within the range of 0.22 λ e to 0.25 λ e which is smaller than [6, 10, 11, 15, 16, 24, 25]. The effect of interconnected ground planes has an inevitable impact on isolation.…”

“…The center-to-center spacing between the adjacent elements in the four-port MIMO antenna is reduced within the range of 0.22 λ e to 0.25 λ e which is smaller than [6, 10, 11, 15, 16, 24, 25].…”

Millimeter-Wave Broadband MIMO Antenna Using Metasurfaces for 5G Cellular Networks

“…The initial circular patch antenna of 28 GHz is calculated using the well-known formula [20]. It was reported that the etching of the slots in the diagonal corners of the antenna patch can improve the impedance bandwidth [21]. Therefore, in the antenna design, the circle patch is etched by two equal circle shapes in the diagonal patch printed on Roger substrate backed with a continuous copper ground plane, as shown in Figure 1(a) (referred to as Ant.…”

Overview of Mobile Communications in Colombia and Introduction to 5G

“…Fifth-generation technology increases channel capacity with more bandwidth per carrier (from 5 to 400 MHz) [ 40 ], being spectrally more efficient due to the higher orders of the modulation schemes [ 41 , 42 ]. Previously employed in 4G, the multiple-input multiple output (MIMO) technique simultaneously uses multiple antennas with multiple channels for signal transmission and reception, increasing channel bandwidth and maintaining antenna efficiency without requiring additional power [ 43 , 44 ]. Antenna gains in the MMIMO (massive MIMO) version used in 5G compensate for channel propagation losses by providing robustness against interference and low latency [ 45 ].…”