紧凑型超宽带MIMO天线的研究

Research of a compact UWB-MIMO antenna with X band-rejected

针对当前超宽带多输入多输出(UWB-MIMO)天线存在尺寸大、隔离度低等缺陷,设计了一款紧凑型UWB-MIMO天线,天线尺寸仅有41 mm×25 mm×1.6 mm。通过扳手形微带馈线扩宽天线的带宽,在天线的接地平面上引入锯齿形和梳状电磁带隙结构以获得较高的隔离度;加载C形枝节形成陷波以抑制X波段的下行频段对超宽带系统的干扰。实验结果表明,所设计的UWB-MIMO天线的阻抗带宽为3.1~12.0 GHz,陷波频带为7.0~7.9 GHz;在整个工作带宽内,隔离度大于20 dB。设计的UWB-MIMO天线具有良好的辐射特性、稳定的增益和较低的包络相关系数(ECC<0.006),适用于UWB-MIMO系统应用。

In order to meet the requirements of miniaturization and high isolation MIMO antenna in wireless communication system,a compact UWB multiple-input multiple-output(MIMO)antenna with high isolation between units is proposed.The antenna size is only 41 mm×25 mm×1.6 mm.The compact UWB MIMO antenna using a spanner microstrip line to widen bandwidth,Serrated grounding structure and comb-shaped electromagnetic band gap(EBG)structure on the ground plane of the antenna helps to obtain higher isolation,introducing C-shaped branches on the antenna discards worldwide interoperability for X-Band satellite downlink communication band.The optimization of various parameters proves that the proposed UWB-MIMO antenna satisfies the port reflection coefficient S;<-10 dB in the 3.1~12.0 GHz band,and the notch band is 7.0~7.9 GHz,the isolation is greater than 20 dB in the entire working bandwidth.The UWB-MIMO antenna designed in this paper has good radiation characteristics,stable gain and low envelope correlation coefficient(ECC<0.006),which is suitable for UWB-MIMO system applications.