Design of compact dual-band dual-port WLAN MIMO antennas using slots

In this paper, a compact printed dual-band dual-port multiple-input multiple-output (MIMO) antenna operating in the 2.4-GHz (2.4-2.5 GHz) band of the IEEE802.11b/g standard and in the 5-GHz (4.9-5.1 GHz, 5.15-5.35 GHz, 5.47-5.725 GHz)band of the IEEE 802.11a with dual band decoupling elements is presented. Each dual-band antenna consists of a one quarter wavelength monopole slot and one half wavelength slot fed by microstip line. To reduce the mutual coupling and achieve high isolation between the two nearby dual-band antennas, we proposetwo narrow λ/4 slits on the ground plane. The simple decoupling slits not only reduce the coupling between antennas, but also improve the impedance bandwidth. Furthermore, the antenna has a compact structure and occupies a small area of 10×46 mm² and it is printed ona FR-4 printed-circuit-board. The proposed antennas are investigated by simulation and measurement.