E-shaped multiple-input-multiple-output (MIMO) microstrip antenna systems operating in WLAN and WiMAX bands (between\n5 and 7.5 GHz) are proposed with enhanced isolation features. The systems are comprised of two antennas that are placed parallel\nand orthogonal to each other, respectively. According to the simulation results, the operating frequency of the MIMO antenna\nsystem is 6.3 GHz, and mutual coupling is below âË?â??18 dB in a parallel arrangement, whereas they are 6.4 GHz and âË?â??25 dB,\nrespectively, in the orthogonal arrangement. The 2 Ã?â?? 3 matrix of C-shaped resonator (CSR) is proposed and placed between the\nantenna elements over the substrate, to reduce the mutual coupling and enhance the isolation between the antennas. More than\n30 dB isolation between the array elements is achieved at the resonant frequency for both of the configurations. The essential\nparameters of the MIMO array such as mutual coupling, surface current distribution, envelop correlation coefficient (ECC),\ndiversity gain (DG), and the total efficiency have been simulated to verify the reliability and the validity of the MIMO system in\nboth parallel and orthogonal configurations. The experimental results are also provided and compared for the mutual coupling\nwith simulated results. An adequate match between the measured and simulated results is achieved.
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