Abstract: This paper designs a dual-band MIMO antenna with T shape branches. Its two operating frequency bands cover the WLAN 2.45 GHz/5.2 GHz/5.8 GHz, respectively. The low-frequency resonance element is an inverted-F antenna. The high-frequency resonance is generated and dual bands are achieved by adding a stub on the low-frequency branch. Two antenna units are placed symmetrically in the horizontal direction to form a two-unit MIMO antenna. Decoupling is achieved by adding T-shaped stubs between two antenna elements. The simulation results show that the isolation of the proposed antenna is exceeded 25 dB in the operating band. The measurement results show that stable omnidirectional radiation performance can be achieved when the antenna isolation exceeds 27.5 dB in the operating frequency band.