A Dual-Band MIMO Antenna Based on Multimode for 5G Smartphone Applications.

In order to meet the current demand for 5G smartphone antennas, this paper introduces a six-port dual-band multiple-input multiple-output (MIMO) antenna designed for 5G smartphones. Based on multimode, the antenna achieves multiple band coverage in a limited space, making it of significant practical value in 5G cell phone antenna applications. The antenna features a structure comprising a modified L-shaped patch antenna, a gun-shaped slot in the ground plane, and two small stubs extending from the metal ground. This configuration creates a multimode antenna that is excited by two coupled feed loop modes and two slot modes. The feeder strips, which have been enhanced with L-shaped slots, form tuned branches, enabling the co-excitation of multiple modes. The MIMO system can operate within the frequency range of 3.3-3.8 GHz and 4.4-7.5 GHz (S₁₁ < -6 dB), covering the 5G communication bands including n78 (3.3-3.8 GHz)/n79 (4.4-5.0 GHz) and the LTE Band 46 (5.15-5.925 GHz). Additionally, the antenna exhibits an envelope correlation coefficient of less than 0.18, antenna efficiency ranging from 60% to 93%, and isolation between adjacent antenna elements better than 12.9 dB. [ABSTRACT FROM AUTHOR]