A compact ultra-wideband MIMO antenna with improved isolation

A compact printed MIMO antenna with an area of 18.7 mm × 45.2 mm and an impedance bandwidth of 129% (based on -10 dB criteria) is presented for UWB applications. The antenna consists of two identical patch elements which are placed on the same substrate with a rectangular microstrip patch in between. The inclusion of microstrip patch improves the isolation and maintains the overall mutual coupling of less than -21 dB (-26 dB in most of the band) over the entire UWB band. The proposed antenna operates over the frequency band ranging from 2.8 GHz to 13 GHz which covers the entire UWB bandwidth with stable radiation patterns. The return loss and the isolation of the antenna are obtained using HFSS simulator.