Wideband High Gain Meatsurface-Based 2*2 MIMO antenna with Highly Isolated Ports for Sub-6 GHz 5G Applications

A high gain and wideband MIMO antenna with highly isolated ports allows the 5G technology to provide reliable wireless communication with high data rate, low latency, increased channel capacity, high signal quality, low power, and high data throughput while maintaining the penetration rate. This study presents the design and simulation of two wideband, high gain, metasurface-based $2\times2$ MIMO antennas operating from 2.85 to 4.2 GHz for 5G applications, which satisfy the 5G requisites. The radiating elements of the two MIMO antennas use the aperture coupled feeding technique with a dumbbell shape slot, a metasurface layer that utilizes the surface wave propagation, and a truncated square patch with two U-shaped slots to attain wideband and high gain performance. The power of the feed radiates through the dumbbell shape slot to illuminate the radiating patch, which allows better manipulation of the coupled power compared with the rectangular slot. The proposed MIMO structure places four identical radiating elements like a $2\times2$ matrix with a rotation of $0^\circ$, $90^\circ$, $180^\circ$, and $270^\circ$ to produce orthogonal electromagnetic waves, which improves the isolation between ports. Two vertical and horizontal strip slots are engraved on the ground as the decoupling structure to decrease the mutual coupling among the radiating elements. Besides, the aperture-coupled feeding technique increases the independence between the radiating elements by isolating the radiating patches and the microstrip feed lines. The CST and HFSS software are used to simulate the antennas.