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A six-port multiple-input-multiple-output (MIMO) antenna system with high port isolation for 5-GHz WLAN access points application is proposed in this letter. It consists of three vertically polarized and three horizontally polarized antenna elements alternately mounted on a pyramidal metal structure. Several techniques are used to improve the isolation performances of the antenna system, including the aperture-coupled feeding mechanism, quarter-wavelength chokes, and parasitic grooves. Measured results show that more than 45 dB isolation can be obtained between any two elements of the system within the operating band.
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Han et al. (2014) studied this question.
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