一种基于磁性材料的小型化高隔离MIMO天线

A Miniaturized Low Coupling MIMO Antenna Based On Magnetic Materials

本文提出了一种采用加载地板枝节实现高隔离的双频八单元MIMO天线。通过采用紧凑的IFA天线组成的天线单元,能够分别在2.60 GHz和3.55 GHz处产生良好的谐振,为了减小天线单元之间的相互耦合,在两天线单元之间引入“T”型地板枝节,使得所提出的MIMO天线在两个工作频带上实现了20.8 dB和25 dB的隔离。此外,为了实现MIMO天线阵列小型化,通过在地板枝节基板加载磁性材料,利用磁性材料的高介电常数和高磁导率实现地板枝节小型化,同时在较大范围内减小两天线单元之间的间距,仿真结果表明在MIMO天线的两个工作频带上依然能够实现较高的隔离,从而满足MIMO天线阵列小型化的需求。

This paper presents a dual-frequency eight-element MIMO antenna with high isolation by loading floor branches.The antenna unit composed of a compact IFA antenna can generate good resonance at 2.60GHz and 3.55GHz respectively.In order to reduce the mutual coupling between the antenna units,a T type floor branch is introduced between the two antenna units.The proposed MIMO antenna achieves 20.8dB and 25dB isolation in two operating frequency bands.In addition,in order to realize the miniaturization of MIMO antenna array,magnetic materials are loaded on the floor segment substrate,and the high dielectric constant and high permeability of the magnetic mate-rials are used to achieve the miniaturization of the floor segment,while the spacing between the two antenna units is reduced in a large range.The simulation results show that high isolation can still be achieved in the two working bands of the MIMO antenna.Thus,the miniaturization of MIMO an-tenna arrays can be met.