一种紧凑型低耦合超宽带MIMO天线设计

A compact low-coupling ultra-wideband MIMO antenna design NAN Jingchang

针对目前超宽带多输入多输出(ultra wideband multiple-input multiple-output,UWB-MIMO)天线存在尺寸大、隔离度低等不足,设计了一款紧凑型高隔离度UWB-MIMO天线。天线正面由“花瓶”形辐射贴片与阶梯形微带馈线组合而成,背面是具有切角的矩形接地板。通过对矩形辐射贴片对称切角、对接地板刻蚀矩形槽,实现天线的宽带化;通过在介质基板正反两面分别加载“鱼骨”形和改进对称“Y”形去耦枝节,实现天线的高隔离度。仿真与实测结果表明:天线尺寸较小,仅有22 mm×29 mm×0.8 mm,最终工作带宽可达1.5~18 GHz(相对带宽为169%),带内隔离度均高于17 dB,包络相关系数小于0.02。天线辐射性能良好且结构简单紧凑,可以很好地应用于UWB-MIMO无线通信系统中。

Aiming at the current ultra-wideband multiple-input multiple-output(UWB-MIMO)antenna that has a large size,low isolation,and other deficiencies,a miniaturized,high-isolation UWB-MIMO antenna is designed.The back side of the antenna is a rectangular ground plate with cutting corners,while the front side is made up of a“vase”-shaped radiation patch and a stepped microstrip feed line.The antenna is broad-banded by symmetrically cutting the corners of the rectangular radiating patch and etching the rectangular slot on the ground plate.The antenna achieves high isolation by loading a“fishbone”shaped and symmetrical“Y”shaped decoupling stubs on the front and back of the dielectric substrate.The antenna was simulated and measured with a size of only 22 mm×29 mm×0.8 mm,having an operating bandwidth of 1.5−18 GHz(the relative bandwidth reaches 169%),isolation is greater than 17 dB in the bandwidth range,and an envelope correlation coefficient(ECC)of less than 0.02.The antenna can be utilized in UWBMIMO wireless communication systems since it has good radiation performance and a simple,small structure.