Abstract
Here, how to control isolation and correlation by adjusting the position of capacitors in a resonance structure in a MIMO ground radiation antenna is studied. The MIMO system consisting of two 7 mm × 7 mm printed ground radiation antennas operating at WLAN on a 40 mm × 40 mm ground plane was installed. If the positions of the capacitors of the two antennas are equally on the top of the ground plane, S12 is −5.2 dB and envelope correlation coefficient is 0.47. When the capacitors are orthogonal to each other, S12 is improved to −16.5 dB and envelope correlation coefficient is improved to 0.12. The orthogonality of the characteristic mode of the ground plane by the antennas is confirmed by the radiation patterns when the position of the capacitor is orthogonal.
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