A planar dual-band semicircle shaped antenna for multi- input multi-output (MIMO) systems is introduced. The antenna was studied experimentally regarding bandwidth and radiation patterns. The measured i10dB return loss bandwidth is from 2.27 to 2.53GHz and 5.03 to 5.58GHz, covering all the 2.4/5.2GHz WLAN bands. Details of the antenna design, simulated and measured results on the return loss and the E- and H-plane radiation patterns of the proposed antenna are presented. The multi-feed 4-elements planar array is simulated using the commercially available software Ansoft HFSS and fabricated that are verifled by good agreement between simulated and measured results. The enhanced performance is obtained by placing antennas uniquely to suppress mutual coupling and utilizing supplemental structure to miniaturize the size of the antennas.
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Fakhr et al. (2009) studied this question.
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