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A printed microstrip-fed four-port ultra-wideband (UWB) MIMO antenna is proposed. Four UWB antenna units are placed perpendicular to each other. Cross structure resonator is loaded on the back of the antenna to achieve high isolation. The UWB frequency is created by the rectangular patch with slots between the feedline and the patch on the front of the antenna. The overall volume of the antenna is 36.5×36.5×1.6mm3. The correlation coefficients of the antenna are less than 0.05 in the working frequency band. The isolation degree of each port is less than -15dB.The S parameters and the radiation patterns are measured and they are consistent with the simulation. The antenna can be applied to the UWB MIMO system.

Novel Compact Four-port Ultra-wideband (UWB) MIMO Antenna Using Cross Structure