In this brief, a low-profile wideband quad-element MIMO antenna with high isolation is designed, which is utilized to propose a 20-elements MIMO system. Each element of the MIMO antenna covers a wideband occupying a small area of15× 15mm2. The orthogonal symmetric arrangement of a single antenna forms an extremely compact quad-element MIMO antenna having shared ground, and its occupied volume is0.84λ g × 0.84λ g × 0.019 λ g(λ gat 3.95 GHz) with a minimum (0.155 λ g) edge to edge distance between elements. The proposed antenna has a −10 dB (S ᵢⱼ ∈ i=j) impedance bandwidth of 77.52% (3.95–8.95 GHz) and a minimum isolation (S ᵢⱼ ∈ i ≠ j) value of 17 dB. The measured and simulated results are found in good agreement that confirms the proposed antenna is appropriate for extending a higher-order MIMO system. Further, a low-profile quad-element MIMO antennas are arranged orthogonally at the four-corners and a quad-element MIMO antenna at the center of form a 20-elements planar MIMO antenna. It can be utilized as a localization system where different user’s devices are connected to the primary host.
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Saurabh et al. (2021) studied this question.
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