Multiple-input multiple-output (MIMO)systems have several advantages, such as providing highcapacity, spatial diversity, etc. MIMO antennas sufferwith high mutual coupling (m-coupling) between theports. In this paper, the metasurface with negative permeability(MNG) is designed and utilized for m-couplingreduction of a two-port rectangular microstrip MIMOantenna (Antenna 1). Two metasurface superstrate-basedMIMO antennas with reduced m-coupling for fifth generation(5G) are proposed. The first design (Antenna2) is constructed using a single metasurface superstratesuspended above the two-port MIMO microstripantenna. The second design (Antenna 3) is constructedusing a double metasurface superstrate layers suspendedabove the two-port MIMO microstrip antenna. Bothmetasurface-based MIMO antennas achieve significantm-coupling reduction over the entire bandwidth. Theedge-to-edge separation between the two patches is0:29l0. The proposed Antenna 3 obtains the reducedm-coupling of 44 dB along with the wide bandwidthof 5:92 6:2 GHz and a maximum gain of 6.79 dB.The proposed antennas are suitable for extended sub-6GHz 5G applications with the operating frequency bandof 5.9–6.1 GHz.
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