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

作　　者：南敬昌[1] 王明寰 王宛 李文佳 NAN Jing-chang;WANG Ming-huan;WANG Wan;LI Wen-jia(College of Electronics and Information Engineering,Liaoning Technical University,Huludao 125105,China)

机构地区：[1]辽宁工程技术大学电子与信息工程学院,葫芦岛125105

出　　处：《微波学报》2021年第3期6-9,46,共5页Journal of Microwaves

基　　金：国家自然科学基金(61971210);辽宁省特聘教授项目(551710007004)。

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。A miniaturized two-port ultra-wideband(UWB) multiple-input multiple-output(MIMO) antenna is proposed. 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.

关 键 词：小型化 MIMO天线 阶梯形微带馈电线 H形枝节和矩形条 高隔离度 

分 类 号：TN822[电子电信—信息与通信工程]