A miniaturized high isolation UWB-MIMO antenna

A compact, high performance, and novel-shaped ultra-wideband (UWB) multiple-input multiple-output (MIMO) antenna with low mutual coupling is presented in this paper. The proposed antenna consists of two circular radiating elements with shared ground plane with an area of 30 mm×18 mm. F-shape stubs are introduced in the shared ground plane of the proposed antenna to produce high isolation between the MIMO antenna elements. The designed MIMO antenna has very low mutual coupling (S₂₁ <−22 dB), low envelope correlation coefficient (ECC < 0.003), high diversity gain (DG > 9.98 dB), which is suitable for UWB-MIMO system applications.