Small-size MIMO antennas for IEEE 802.11 ac applications

In the paper, the design of MIMO antennas with three ports is proposed and investigated. The three monopole antennas are fed by 50-ohm mini coaxial cable lines. Three monopoles are located as the right, the middle and the left side of the top edge of the design. Two L-shaped strips protruded from the ground and four inverted L-shaped strips extended from the ground is introduced to the design for enhancing isolation between them and impedance matching. From the measured results, the operating bands of 5.15-5.35GHz cover the bands of IEEE802.11 ac applications. The simulated and measured results are compared and discussed.