可用于物联网的高隔离度双频MIMO天线

设计了一种高隔离度双频多输入多输出（MIMO）天线，该天线覆盖2.4 GHz和5 GHz无线局域网频带，可以应用于移动物联网之中。天线包含两个相同的辐射单元天线，采用微带馈电的方式进行馈电。单元天线使用单极子天线作为基本辐射器，其包含一根长的和短的单极子天线，分别谐振在低频和高频频段。通过在两个单元天线中间加载T型隔离器提高了单元天线之间的隔离度。天线的辐射振子、馈电以及T型隔离器都印刷在同一块微波板材上，从而方便了天线的制作和加工。仿真结果表明，该天线在1.9~2.8 GHz以及4.7~6.2 GHz频带范围内能实现良好的双频工作特性，天线隔离度近20 dB，可以广泛应用于物联网系统中。

A dual-band MIMO antenna with high isolation for internet of things

A high isolation dual frequency Multiple-Input Multiple-Output (MIMO) antenna is designed,which covers 2.4 GHz and 5 GHz wireless Local Area Network (LAN) bands and can be used in mobile Internet of Things(IOT). The antenna contains two identical radiating element antennas,which are fed with microstrip feed. The unit antenna uses a monopole antenna as a basic radiator,which contains a long and a short monopole antenna that resonates in the low frequency and high frequency bands,respectively. The isolation between the unit antennas is improved by loading the T-type isolator in the middle of the two unit antennas. The antenna''s radiator,feed and T-type isolators are printed on the same microwave plate,thus facilitating the production and processing of the antenna. The simulation results show that the antenna can achieve good dual-band operation in 1.9~2.8 GHz and 4.7~6.2 GHz with the two-unit antenna isolation of nearly 20 dB in the 2.4 GHz and 5 GHz bands.The designed antenna can be widely used in the IOT systems.