The Multiple Input Multiple Output (MIMO) system in the 5G wireless communication system is essential to enhance channel capacity and provide a high data rate resulting in a need for dual-polarization in vertical and horizontal. Furthermore, size reduction is critical in a MIMO system to deploy more antenna elements requiring a compact, low-profile design. A compact dual-band 4-MIMO antenna system has been presented in this paper with pattern and polarization diversity. The proposed single antenna structure has been designed using two antenna layers with a C shape in the front layer and a partial slot with a U-shaped cut in the ground to enhance isolation. The 4-MIMO antenna elements were printed orthogonally on an FR4 substrate with a size dimension of 36 × 36 × 1.6 mm3 with zero edge-to-edge separation distance. The proposed compact 4-MIMO antenna elements resonate at 3.4-3.6 GHz and 4.8-5 GHz. The s-parameters measurement and simulation results agree with a slight frequency shift of the measurement results at the upper band due to fabrication imperfection. The proposed design shows isolation above -15 dB and -22 dB. The MIMO diversity performance has been evaluated in terms of efficiency, envelope correlation coefficient (ECC), diversity gain (DG), total active reflection coefficient (TARC), and channel capacity loss (CCL). The total and radiation efficiency were above 50 % across all parameters at both frequency bands. The ECC values were lower than 0.10, and the DG results were about 9.95 dB in all antenna elements. TARC results exhibited values lower than -25 dB at the dual-bands. Moreover, the channel capacity losses in the MIMO system were depicted using CCL, resulting in values lower than 0.4 Bits/s/Hz. As a result, the proposed design is adequate for 5G applications.
Fayad Mohammed Ghawbar is an Engineering Technology Ph.D. candidate at Universiti Tun Hussein Onn Malaysia, Batu Pahat, Malaysia. He has received the Master of electrical engineering in 2015 from Universiti Tun Hussein Onn Malaysia. Previously, he has obtained his first degree from Universiti Malaysia Pahang, Malaysia, with honors, in electrical & electronics engineering in 2013. His current Ph.D. research is under RF Microwave MIMO technology for 5G applications, especially smartphones. Besides, he is doing recent research about metamaterials to be deployed in high order MIMO antennas for 5G smartphones to reduce the mutual coupling effect..
Share this page on your timeline