A Miniaturized Eight-Port MIMO Antenna for 5G Ultra-Slim Smartphones

Abstract

This paper presents the design of a miniaturized eight-port multiple-input multiple-output (MIMO) antenna. Each proposed antenna element occupies only 6.2 × 7 × 0.8 mm³, making it ideal for integration into ultra-slim 5G smartphones. The proposed MIMO antenna offers a −10 dB impedance bandwidth of 1.7 GHz (3.3 to 5.0 GHz), covering the N77 (3.3–4.2 GHz), N78 (3.3–3.8 GHz), and N79 (4.8–5.0 GHz) bands. The isolation between the antenna elements is larger than 16 dB. The envelope correlation coefficient (ECC) of the designed antenna is lower than 0.09. Meanwhile, the peak gain exceeds 2.2 dBi, the efficiency surpasses 70%, and the diversity gain (DG) is higher than 9.95. This innovative design addresses the demands of ultra-slim mobile devices while maintaining high performance.