volume | PIER Journals

Abstract

This paper proposes a polarization-orthogonal self-decoupling wideband shared-radiator Multiple-Input Multiple-Output (MIMO) antenna for 5G mobile terminals. The antenna is fabricated on an FR4 dielectric substrate with a relative permittivity of 4.4 and a loss tangent of 0.02, and integrates a cross-shaped radiation patch, L-shaped slots and metallized shorting vias into a 27 mm × 27 mm standard-sized substrate, and generates polarization-orthogonal modes through dual-port excitation, with an electrical size of 0.35λ₀ × 0.35λ₀ × 0.021λ₀ at the center frequency of 3.9 GHz, which effectively suppresses the mutual coupling between ports. To fully demonstrate the wideband characteristics and self-decoupling advantages of this shared radiator, four identical antenna element pairs are arranged at the four corners of the smartphone rear cover, constructing an 8×8 MIMO antenna system operating in the 3.5-4.3 GHz frequency band. Simulated and measured results show that the proposed 8 × 8 MIMO system achieves an isolation better than 15 dB and an envelope correlation coefficient (ECC) less than 0.06. Featuring wideband operation and a passive self-decoupling structure, this antenna provides a promising design solution for 5G smartphone antennas.

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Dr. Xinxin Wang

Professor Zhonggen Wang

Professor Wenyan Nie

Dr. Shunqi Liu

Dr. Quan Sun