A novel compact dual-band multiple-input-multipleoutput (MIMO) antenna design for IEEE 802.11 applications is proposed. The antenna operates at 4.9-5.725 GHz with four ports and at 2.4-2.5 GHz with two ports and utilizes a dual-band dualport MIMO antenna to cover the 2.4/5-GHz bands alongside two single-band antennas to cover the 5-GHz band. This allows simultaneous operation at both WLAN frequencies while having only four ports in total. Isolation between ports is better than 12 dB and is achieved with no reconfigurable elements. The overall antenna size is compact, occupying 46 × 20 × 1.6 mm3, and is printed on an FR-4 printed circuit board. The proposed antenna is investigated by simulation and measurement, and results include radiation patterns, efficiency, S-parameters, signal correlations, and branch power ratios between ports. These show that in typical wireless environments, envelope cross correlations of less than 0.3 between the ports are obtained.
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Soltani et al. (2016) studied this question.
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