Eight-element MIMO antenna array for 5G/Sub-6GHz indoor micro wireless access points

An eight-element multiple-input multiple-output (MIMO) antenna applied for 5G and sub-6GHz indoor wireless access points is studied in this paper. The proposed antenna array supports 4 × 4 MIMO in the LTE bands 42/43/46 (3400-3600 MHz, 3600-3800 MHz, and 5150-5925 MHz). Four fork-like electric dipoles disposed at the corners of the system circuit board cover the LTE bands 42/43, while four inverted L-shaped open slots placed along the edges support the LTE band 46. The proposed antenna array exhibits good impedance matching and isolation, with return losses greater than 10 dB and isolations larger than 15 dB. The total efficiency of the antenna array is higher than 70% in the desired operation bands. The envelope correlation coefficient (ECC) and ergodic channel capacity are calculated to verify the MIMO performance.