Abstract: This paper presents an ultra-wideband (UWB) multiple-input multiple-output (MIMO) antenna, which has high isolation and double band-notch in the UWB band. The MIMO antenna consists of two half-cutting UWB antenna units which have high isolation (S₂₁＞25 dB) because of the use of a novel fence-type decoupling structure on the bottom plate of the antenna. In addition, two “L”shaped slots are etched on the antenna radiation patch, and the characteristic of the double band-notch are realized. The interference of the 802.16 WiMAX (3.2−3.7 GHz) and the WLAN (5.15−5.85 GHz) signal to the antenna system is suppressed, respectively. The experimental results show that the antenna has high isolation and a low envelope correlation coefficient (ECC＜0.004) in the UWB band. The first notch band is 3.0−3.7 GHz and the second notch band is 5.1−5.8 GHz, which effectively suppresses the interference of WiMAX and WLAN signals.