A 4-Element UWB MIMO Antenna System with High Isolation Performance

This paper proposes a 4 -element multipleinput multiple -output (MIMO) antenna system, which is intended for ultra-wideband (UWB) applications. The antenna has a dimension of 92 x 70 x 1.6 mm3. It achieves element isolation via the defected ground structure (DGS) and symmetric E -shaped branch structures design. The realized operating bandwidth is from 3 GHz to 18 GHz, with 15 dB isolation within the whole wide band. The envelope correlation coefficient (ECC) is less than 0.01 with diversity gain (DG) greater than 9.95. The prototype is fabricated and measured to verify its potential applications for UWB MIMO communication.