Dual-Band Eight Element Antenna Array for 5G Mobile Terminals

In this paper, a dual-band eight-element MIMO antenna is presented for mobile devices, which operates in the 5G NR band n77 (3.3–4.2[Formula: see text]GHz), n48 (3.55–3.7[Formula: see text]GHz), n78 (3.3–3.8[Formula: see text]GHz), and n104 (6.425–7.125[Formula: see text]GHz). The gap between the two bands n77 and n104 is quite high, which leaves no room for adjacent band interference scenarios. The single-element planar antenna, a combination of inverted L and inverted Z units, measures 18[Formula: see text]mm in length and 7[Formula: see text]mm in height, making it compact enough for use in slim mobile phone devices. Each antenna element resonates at 3.7[Formula: see text]GHz and 6.7[Formula: see text]GHz. The distances between the antenna elements have been adjusted in such a way as to achieve self-decoupling and show isolation between adjacent ports, being better than [Formula: see text]17.3 dB. The [Formula: see text]6 dB impedance bandwidth is observed to be 0.84[Formula: see text]GHz and 1.27[Formula: see text]GHz for 3.7[Formula: see text]GHz and 6.7[Formula: see text]GHz, respectively, which covers a large portion of the 5G bands. The lower band is covering the widely used n77 band, while the higher band covers the n104 band, which has been selected for future WiFi-6E/7 and Sub-6[Formula: see text]GHz 5G applications. To validate simulated results, the measured results from a fabricated prototype unit have also been provided along with the simulated results.