一种高隔离度陷波UWB-MIMO天线设计

Design of a High Isolation Notched UWB-MIMO Antenna

为了满足日益丰富的通信需求,提出了一款具有陷波特性的高隔离度超宽带(Ultra Wide Band, UWB)多输入多输出(Multiple Input Multiple Output, MIMO)天线。采用微带天线作为基础模型,基于对称切半法实现了天线单元的小型化,利用在辐射单元上电流较为集中处开槽的方法实现滤波特性,通过在地板上加载T型枝节与方向图分集技术相结合有效减小了MIMO天线单元间的耦合能量。基于仿真模型进行实物加工,测试结果表明,天线工作带宽可完全覆盖3.1~10.6 GHz,所设计天线阻抗带宽覆盖陷波频段为5.0~5.9 GHz,在该频段内增益下降明显,在通带频段内天线单元间的隔离度大于20 dBi,包络相关系数(Envelope Correlation Coefficient, ECC)小于0.05,方向图仿真结果与测试结果吻合度良好,结果表明所提出的天线结构紧凑且电性能良好,为UWB滤波通信系统提供了切实可行的设计方案。

In order to meet the increasingly diverse communication needs,a high isolation Ultra Wide Band(UWB)Multiple Input Multiple Output(MIMO)antenna with notch characteristics is proposed.Using microstrip antennas as the basic model,the miniaturization of antenna units is achieved based on the symmetrical half cut method.The filtering characteristics are achieved by slotting at the current concentration on the radiation unit.The coupling energy between MIMO antenna elements is effectively decreased by combining T-shaped branches loaded on the floor with pattern diversity technology.Based on the simulation results,an antenna prototype is processed and tested.The designed antenna working bandwidth covers 3.1~10.6 GHz,and the impedance bandwidth covers the notched frequency band of 5.0~5.9 GHz.The gain decreases significantly in this frequency band.The isolation between antenna elements in the passband frequency band is greater than 20 dBi,and the Envelope Correlation Coefficient(ECC)is less than 0.05.The simulation results of the directional pattern are in good agreement with the test results.The results show that the proposed antenna has compact structure and good electrical performance,which provides a feasible design scheme for UWB filtering communication system.