A dual-polarized antenna with low cross polarization, high gain, and isolation for the fifth-generation array/ multiple-input multiple-output communications

摘要

A dual-polarized antenna for the fifth-generation (5G) array/massive multipleinputmultiple-output (MIMO) communications is proposed in this paper.Through combining dual-polarized differentially feeding structure and complementarymagneto-electric (ME) dipole antenna, low cross polarization (X-pol),high gain, and isolation characteristics can be achieved by the antenna element.To take advantage of these characteristics in the array, a modified 1-to-16-way H-shaped differentially feeding network is designed to feed the16-element antenna array. Here, vertical cross-shaped patches with dotted slotsare arranged between adjacent ME-dipole antenna elements to furtherimprove the array isolation. By removing the H-shaped differentially feedingnetwork and the substrate at the bottom, a high-capacity MIMO antenna systemcan be achieved. Measured results show that low X-pol level of −35.7 dBand high gain of larger than 8.1 dBi can be attained by the antenna elementsacross the 5G frequency bands (3.3-5.1 GHz). In addition, the antenna arrayhas exhibited high gain of 17.3 dBi and the MIMO antenna has realized verylow envelope correlation coefficient of 0.004.