An 8-element dual-band multiple-input-multiple-output (MIMO) antenna operating in the 5G New Radio band n77 (3300-4200 MHz) and 5 GHz band (4800-5000 MHz) in mobile handsets is presented. The 8-element MIMO antenna is formed by employing four sets of dual-antenna arrays (DAAs) that are symmetrically printed along the two long side-edge frames of the smartphone. Each DAA is composed of two double-branch monopoles and a T-shaped decoupling stub, in which good mutual coupling reduction can be realized via the decoupling structures. Furthermore, the decoupling structures can also aid in improving the impedance matching of the array units for achieving wideband operation.
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Cui et al. (2019) studied this question.
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