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We propose a novel, compact, dual-polarized ultra-wideband (UWB)–multiple-input multiple-output (MIMO) antenna, which consists of an F-shaped monopole which band rejects the IEEE 802.11ac frequency band from 5.1 to 5.95 GHz with microstrip line feeding. The suppression of the inevitable mutual coupling is achieved by using techniques such as orthogonal polarization, defected ground structure, and metamaterials. A split-ring resonator is placed between the antenna elements to reduce the coupling. The antenna has wideband impedance matching with S₁₁ < −10 dB in the UWB frequency range from 3.1 to 10.6 GHz and has a low mutual coupling with |S₂₁| < −20 dB. The antenna has very low envelope correlation coefficient with values equal to zero and low capacity loss value of 0.358, which proves that the MIMO antenna shows good diversity performance. The antenna has a bandwidth of …