Ten Port and Fourteen Port MIMO Arrays for 5G Smart Phone Applications in a Sub 6 GHz band

Abstract

— In this paper, two designs of ten port and fourteen port Massive Multiple-Input–Multiple-Output (MIMO) arrays are proposed for the Fifth Generation (5G) cellphone applications. A dual-band ring loop antenna is proposed to cover the LTE band 42 (3.4 – 3.6 GHz), LTE band 43 (3.6 – 3.8 GHz), and LTE band 46 (5.15 – 5.925 GHz). The proposed arrays are designed with changing the battery position and exploiting the space to add more antennas. Also, better isolation may be achieved concerning the use of spatial diversity methods on the antenna components. To achieve higher isolation, the substrate is formed as the loop antenna elements are printed on a separated dodecagon FR4 substrate with different orientation angles. The proposed designs achieve isolation better than -26 dB. Envelope Correlation Coefficient (ECC) based on S-parameters is found to be better than 0.005 in LTE band 42/43 and 0.006 in LTE band 46. Also, the ECC is calculated based on far-field radiation patterns and is found to be less than 0.2 in LTE band 42/43 and less than 0.12 in LTE band 46. The channel capacities are attained, the 10 × 10 MIMO achieve 57.6 bps/Hz, and the 14 × 14 MIMO achieve 72 bps/Hz. Additionally, The Specific Absorption Rate (SAR), Diversity Gain (DG), and the effect of frame insertion on the proposed array are also discussed.