The effect of changing the formation of multiple input multiple output antennas on the gain

In this paper, different 2×1 and 2×2 multiple input output (MIMO) antennas were investigated with changing substrate shapes the placing of patches on substrate, all based FR-4 are characterized by , loss a partial ground. The original antenna covered 3.4 to 13.5 GHz. best simulation results proposed MIMO received for inverted high ultra-wideband (UWB) bandwidth up 40 GHz, maximum gain was 6.51 dB, an average more than single at about +1.27 dB. eight configurations that give good shown. best-received compared 4.2 GHz +2.73, +1.17, +0.92 dB plus-shaped, loop, chair-shaped respectively. A comparison between other reported works done. suitable narrow bands within UWB such as wireless local area network (WLAN), worldwide interoperability microwave access (WiMAX), aeronautical radio navigation (ARN), International Telecommunication Union 8-GHz (ITU-8), X-Band applications ability without need increase radiated power transmitter antenna.