基于极化分集的四单元三陷波超宽带天线设计

Design of four-element triple-band-notched UWB antenna based on polarization diversity

针对超宽带(UWB)系统中存在窄带信号干扰的问题,设计了一种四单元三陷波UWB天线。天线由4个水平正交放置的圆形贴片、微带馈线以及矩形接地板组成,通过在天线辐射贴片和微带馈线上刻蚀不同结构的几何缝隙实现了天线的三陷波特性。在介质基板背面添加十字形谐振枝节,有效提高了天线单元之间的隔离度。该天线尺寸为40 mm×40 mm×1.6 mm。实验结果表明:工作带宽为2~12 GHz,包络相关系数(ECC)小于0.02,分集增益(DG)大于9.92 dB,总有效反射系数(TARC)小于-2.38 dB,可广泛应用在UWB系统中。

Aiming at the problem of interference of narrowband signal in ultra-wideband(UWB)system,a fourelement triple-band-notched UWB antenna is designed.The antenna is composed of four horizontally and orthogonal circular patches,microstrip feeders and rectangular ground plate.By etching geometric gaps with different structures on the antenna radiation patch and microstrip feeders,the triple-band-notched characteristics of the antenna are realized.The isolation degree between antenna elements is improved effectively by adding cross type resonant branches on the back of dielectric substrate.The size of the antenna is 40 mm×40 mm×1.6 mm.Experimental results show that the operating bandwidth is 2~12 GHz,the envelope correlation coefficient(ECC)is less than 0.02,the diversity gain(DG)is greater than 9.92 dB,and the total active reflection coefficient(TARC)is less than-2.38 dB,which can be widely used in UWB systems.