A New Miniaturized Ultra-Wideband High-Isolated Two-Port MIMO Antenna for 5G Millimeter-Wave Applications

At present, the fifth-generation (5G) technology is of paramount importance since it aspires to account for the limitations of the preceding 4G generation. Among the multiple existing technologies, the mm-wave grabbed the researcher’s attention in an attempt to attain maximum data transfer rates and prevent network congestion. In pursuit of this objective, this piece of work involves devising a compact ultra-wideband (UWB) MIMO antenna with an anti-parallel layout specifically designed for the millimeter-wave spectrum. Additionally, the study examines and refines the mutual coupling interaction amid the two elements in depth. The presented MIMO antenna occupies a small footprint of 6 × 17.37 mm2. Despite its compact size, this MIMO antenna reached 65 dB owing to the sufficient inter-element distance and the anti-parallel arrangement. Furthermore, an isolation enhancement of roughly 20 dB is attained when utilizing a defected ground structure (DGS). Besides, the suggested MIMO antenna exhibits a satisfactory gain of around 6 dBi, offers a high efficiency exceeding 96% and covers the band 34.1–39.7 GHz. Based on the above results, the suggested MIMO antenna seems to be compatible with the 5G communication systems.