Abstract
The 5G Technology is being implemented in the developed countries and its employment in the developing countries will take time. This technology will support high speed data rate and require multiple input and multiple output (MIMO) Patch antenna having a very large bandwidth. The MIMO antennas are located in the close vicinity of each other and their mutual coupling degrades the performance of the antenna. Patch antennas are very popular antennas as they have been successfully applied in aircraft, space technology, mobile communication, biomedical and their demand in future wireless communication is increasing on daily basis. So the bandwidth expansion and the reduction of the mutual coupling of these MIMO patch antennas for its implementation in 5G technology have attracted the attention of the scientists working in the area of patch antenna and wireless communication systems. Procedures have been suggested in literature to improve the bandwidth and reduce the mutual coupling of the MIMO antennas. In this paper, some old techniques in combination with a new technique of augmented ground structure (AGS) are executed to enhance the bandwidth and reduce the mutual coupling between the two elements of the dual band MIMO antenna. Two rectangular patch structures with two parasitic elements are placed side by side.In order to investigate the performance of this MIMO antenna, 1.64 mm thick substrate of Preperm L450and a defected ground structure are used. The dielectric constant of this substrate is 4.5. The substrate of the MIMO antenna is 40mm long and 50mm wide. This dual band MIMO antenna has a large bandwidth of 18GHz in Band-1and a large bandwidth of 13GHz in Band-2.The mutual coupling was retained below the acceptable value of -16dB. The return loss, SWR with respect to voltage, efficiencies, gain, directivity and mutual coupling of both the antennas of this MIMO system has been investigated. It can be efficiently applied in the future 5G technology of wireless communication system.
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