A Compact mmWave MIMO Antenna for Future Wireless Networks

Abstract

This article presents a four-element multiple-input multiple-output (MIMO) antenna design for next-generation millimeter-wave (mmWave) communication systems. The single antenna element of the MIMO systems consists of a T-shaped and plow-shaped patch radiator designed on an ultra-thin Rogers RT/Duroid 5880 substrate. The dimensions of the single antenna are 10 × 12 mm2. The MIMO system is designed by placing four elements in a polarization diversity configuration whose overall dimensions are 24 × 24 mm2. From the measured results, it is observed that the MIMO antenna provides 9.23 GHz impedance bandwidth ranging from 22.43 to 31.66 GHz. In addition, without the utilization of any decoupling network, a minimum isolation of 25 dB is achieved between adjacent MIMO elements. Furthermore, the proposed MIMO antenna system is fabricated, and it is noted that the simulated results are in good agreement with the measured results. Through the achieved results, it can be said that the proposed MIMO antenna system can be used in 5G mmWave radio frequency (RF) front-ends.

Planar MIMO antenna for mmWave applications: Evolution, present status & future scope

“…The MIMO antennas designed in Refs. [ 56 , [78] , [79] , [80] , [81] , [82] , [83] , [84] , [85] , [86] ] don't share the common ground point, which obviously results in better isolation S ij between the ports. And also, these are arranged in 180 0 /orthogonal orientation to reduce mutual coupling and enhance isolation.…”

“…The MIMO design in Refs. [ [80] , [81] , [82] , [83] , [84] , [85] , [86] ], and [ 56 ] are the 4-port element which is orthogonal/180 0 oriented for better isolation with the partial ground plane. In Ref.…”

“…Similar to the earlier design, a combination of T with a plow-shape structure is designed on Rogers 5880 substrate in Ref. [ 84 ]. The patch radiator is supported by a partial ground plane etched at the substrate's bottom to obtain the desired bandwidth.…”

“…It has increased the isolation of −30 dB and higher throughout the band. The performance of these MIMO antennas is as follows: bandwidth 27.6–29.7 GHz, 27.6–28.4 GHz/37.9–38.5 GHz, 26–29 GHz, 27–28 GHz/37.2–38.8 GHz, 23.6–31.5 GHz, 26.5–30.8 GHz, 24.2–37.8 GHz, and 27–28.8 GHz/36–38.7 GHz, gain 6.1 dBi, 7.9 dBi, 6.5 dBi, 7.95/8.27 dBi, 5.66 dBi, 8 dBi, 6.4 dBi, 6 dBi/5 dBi, isolation −29 dB, −28 dB, −25 dB, −30/-24 dB, −27.5 dB, −22.5 dB, −27 dB, −30 dB/−32.5 dB and radiation is omnidirectional [ 80 ], broadside with 35 0 in E− and H-plane [ 81 ], omnidirectional [ 82 ], broadside with 60 0 at 28 GHz, 90 0 at 38 GHz in E-plane [ 83 ], omnidirectional [ 84 ], bidirectional with 110 0 in E-plane [ 85 ], bidirectional with 60 0 and 70 0 in E− and H-plane [ 86 ], 75 0 and 90 0 in E− and H-plane at 28 GHz/90 0 in E− and H-plane at 38 GHz [ 56 ]. The performance metrics of DGS non-common ground MIMO antennas are shown in Fig.…”

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Fig. 19 Prototype fabrication of DGS non-common ground MIMO antennas, (a) [ 78 ], (b) [ 79 ], (c) [ 80 ], (d) [ 81 ], (e) [ 83 ], (f) [ 82 ], (g) [ 84 ], (h) [ 85 ], (i) [ 86 ], (j) [ 56 ].

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