具有双陷波特性的UWB-MIMO天线

提出了一款具有双陷波特性的紧凑型超宽带多输入多输出(ultra wideband multiple-input multiple-output, UWB-MIMO)天线. 天线由两个辐射元件组成，整体尺寸为41 mm×25 mm×1.6 mm. 通过在天线的接地平面中引入两个叠加的T型结构获得良好的隔离度；同时，通过在天线上刻蚀C型槽和U型槽实现双陷波特性，有效抑制了无线局域网(wireless local area networks, WLAN)和X波段通信卫星的干扰；并从表面电流分布的角度分析了陷波原理. 实验结果表明:所设计的MIMO天线的阻抗带宽为2.8~13.4 GHz，两个陷波频带分别为4.8~5.94 GHz和6.9~8.23 GHz；在整个工作带宽内，隔离度大于15 dB. 说明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(envelope correlation coefficient, ECC)(<0.1)，适用于UWB-MIMO系统应用.

UWB-MIMO antenna with dual band-notched characteristics

A compact ultra-wideband MIMO antenna with dual notch characteristics is proposed. The antenna consists of two radiating elements, the overall size is 41 mm×25 mm×1.6 mm. Good isolation is achieved by introducing two superimposed T-shaped structures in the ground plane of the antenna. At the same time, by etching the C-slot and U-slot on the antenna, dual notch characteristics can be achieved, effectively suppressing interference from WLAN and X-band communication satellites. The notch principle is analyzed from the perspective of surface current distribution. Experimental results show that the impedance bandwidth of the designed MIMO antenna is 2.8?13.4 GHz, and the two notch bands are 4.8?5.94 GHz and 6.9?8.23 GHz, respectively. Within the entire operating bandwidth, the isolation is greater than 15 dB. MIMO antenna has good radiation characteristics, stable gain and very low envelope correlation coefficient (ECC <0.1), suitable for UWB-MIMO system applications.