A dual-band eight-antenna multi-input multi-output array for 5G metal-framed smartphones

摘要

A dual-band eight-antenna array operating in the long-term evolution (LTE) band 41 (2.496-2.69 GHz) and 3.5-GHz band (3.3-3.7 GHz) for fifth-generation (5G) metal-framed smartphone is presented. The proposed dual-band antenna array is composed of four identical dual-antenna building blocks (DABBs). Each DABB consists of two identical antenna elements with a neutralization line between them. The antenna array is simulated, fabricated, and measured. The isolations are better than 10.5 dB and 11.0 dB in the low band (LB; LTE band 41) and high band (HB; 3.5-GHz band). The total efficiencies are 41% to 54% and 46% to 64% in the two operation bands, respectively. In addition, the measured envelope correlation coefficients are less than 0.11 and 0.06, the calculated channel capacities are better than 34.5 and 36.3 bps/Hz in the LB and HB, respectively. Furthermore, four hand-grip scenarios are investigated, and results show that proposed antenna array can maintain excellent multiple-input multiple-output performances in all scenarios.