CPW Fed Compact UWB 4-Element MIMO Antenna with High Isolation

In the paper, an extremely compact multiple-input-multiple-output (MIMO) antenna is proposed for portable wireless ultrawideband (UWB) applications. The prototype consists of four monopole elements, which are placed perpendicularly to achieve polarization diversity. addition, mutual coupling between elements suppressed by designing gap radiation element and ground plane. Moreover, a matching stub has been connected feedline ensure impedance in high frequency. Both simulated measured results indicate that bandwidth 3–20 GHz, with isolation better than 17 dB. designed MIMO offers excellent characteristics stable gain over whole working band. envelope correlation coefficient (ECC) less 0.1, shows can meet diversity well.