采用阶梯形微带馈线的高隔离度超宽带MIMO天线

Design of High Isolation UWB MIMO Antenna Employing Stepped Microstrip Feeder

摘要: 提出了一种小型二端口超宽带(UWB)多输入多输出(MIMO)天线。该天线由两个相同的矩形单极子和缺陷地结构(DGS)组成,通过改进阶梯形微带馈电线,在介质基板底层和顶层添加H 形枝节,并在辐射贴片上添加矩形条,提高了天线的带宽和隔离度。实验结果表明:该天线在1~20 GHz 工作频带内的隔离度大于21 dB,包络相关系数小于0.02。实测与仿真结果相符,表明该天线适用于UWB MIMO 系统,且该天线结构紧凑,尺寸仅为22 mm×29 mm×0.8 mm,可用于便携式通信设备。

Abstract: A miniaturized two-port ultra-wideband (UWB) multiple-input multiple-output (MIMO) antenna is proproposed.The antenna consists of two identical rectangular monopoles and a defective ground structure (DGS). The bandwidth and isolation of the antenna are improved by modifying the stepped microstrip feed line, adding H-shaped branches to the bottom and top layers of the dielectric substrate, and adding rectangular strips to the radiating patch. The experimental results show that the isolation of the antenna is greater than 21 dB in the operating band from 1 to 20 GHz and the envelope correlation coefficient is less than 0.02. The measured and simulated results show that the antenna is suitable for UWB MIMO systems and that the antenna is compact, measuring only 22 mm×29 mm×0.8 mm, and can be used in portable communication devices.