一种应用于5G的高隔离度双频MIMO天线设计  

A High Isolation Dual‑frequency MIMO Antenna for 5G Applications

作　　者：段铸 BILLAH MASUM 白茹冰 Zhu DUAN;MASUM BILLAH;BAI Rubing(Research Center of Applied Electromagnetics,Nanjing University of Information Science and Technology,Nanjing,210044,CHN)

机构地区：[1]南京信息工程大学应用电磁学研究中心,南京210044

出　　处：《固体电子学研究与进展》2025年第2期67-72,共6页Research & Progress of SSE

摘　　要：提出了一种应用于5G的高隔离度双频多输入多输出(Multiple-input multiple-output,MIMO)天线。采用圆形单极子作为天线单元,通过在圆形辐射贴片上刻蚀C型槽来产生新的谐振,实现了天线的双频特性。天线单元间的边缘间距仅为12 mm(0.14λ_(L),λ_(L)为低频谐振点3.5 GHz处的自由空间波长),为避免距离较近导致天线单元间产生强烈的相互耦合,在金属地板上引入T型去耦枝节并刻蚀矩形槽结构,有效提高了天线单元间的隔离度。天线最终尺寸为58.0 mm×34.0 mm×1.6 mm。测试结果表明,该天线的工作频段(|S_(11)|<-10 dB)为2.71~3.92 GHz和4.45~5.60 GHz,其相对带宽分别为36.5%和22.9%,天线单元间的隔离度分别大于26 dB和28 dB,包络相关系数均小于0.004。A high isolation dual-frequency multiple-input multiple-output(MIMO)antenna for 5G was proposed in this paper.The antenna adopted a circular monopole as the antenna element,and the new resonance was generated by etching a C-shaped slot on the circular radiation patch,which realized the dual-frequency characteristics of the antenna.The edge spacing between the antenna elements is only 12 mm(0.14λ_(L),λ_(L) is the free space wavelength at the low frequency resonance point 3.5 GHz).In order to avoid strong coupling between the antenna elements due to the close distance,the isolation between the antenna elements is effectively improved by introducing T-shaped decoupling branch and etching rectangular slot structure on the metal floor.The final size of the antenna is 58.0 mm×34.0 mm×1.6 mm.The test results show that the working frequency band(|S_(11|)<-10 dB)of the antenna is 2.71-3.92 GHz and 4.45-5.60 GHz,and the relative bandwidth is 36.5%and 22.9%,the isolation between the antenna elements is greater than 26 dB and 28 dB,respectively,and the envelope correlation coefficient is less than 0.004.

关 键 词：多输入多输出 双频段 高隔离度 单极子天线 去耦合结构 

分 类 号：TN82[电子电信—信息与通信工程]