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A MIMO Antenna Array with Low Coupling for Sub-6GHz Communication Applications

A multiple-input multiple-output (MIMO) antenna array is proposed with two identical antennas for sub-6GHz communication applications. The proposed antenna element is a proximity coupling fed split-ring antenna, which is excited by a 50-Ohm microstrip line. The simple split-ring is installed on one side of the feeding line. In the designed MIMO antenna array, the two split-rings are set at the outer of the antenna, which can provide enough space to develop amazing decoupling structures between the two antenna elements. A fork-like slot is integrated into the middle of the ground and two L-shape-like slot are designed at each side of the ground plane. The designed MIMO array is modeled in the HFSS and its performance is analyzed in detail including the reflection coefficient, isolation, parameter effects and the radiation patterns. The results prove that the designed MIMO antenna can provide a low coupling and a good omnidirectional radiation patterns in the operating sub-6GHz.