Compact 3-D eight elements UWB-MIMO array

An eight elements, compact, ultra-wideband multiple-input-multiple-output (MIMO) 3-D antenna array is reported. The proposed antenna system consists of eight monopole radiators, four elements are designed in planar configuration and four elements are placed perpendicularly to the planar configuration. Four elements are provided with a U-shaped slot to match the input impedance over the entire bandwidth. All the monopoles are placed strategically to exploit polarization diversity which is believed to improve isolation. Good impedance matching and isolation higher than 15 dB are observed over the 3-11 GHz frequency range. The proposed MIMO antenna array has a total size of 50 × 50 × 25 mm3 and measurements of prototype printed on a 1.524 mm thick Rogers TMM4 laminate resulted in good agreement with full wave numerical simulations. The proposed design provides high degree of isolation without compromise on compactness and also operated over wideband.