缺陷地结构在双频MIMO天线中的应用

Defected Ground Structure Applied to the Dual-band MIMO Antennas Systems

为了提高微带天线问的端口隔离度,提出了一种将缺陷地结构(DGS)应用在MIMO天线中的方法。利用一种双矩形开口谐振环(RCSRR)型的DGS结构排布在两天线之间,并对这种DGS结构进行了参数分析。这种紧致型的双矩形开口谐振环包括两个矩形的开口谐振环,并位于两金属贴片之间,每一个谐振环分别控制一个去耦的谐振频率。仿真和实测结果表明,将DGS结构应用于双频微带天线中可以在2.3/4GHz工作频段上很好地改善端口隔离度,端口间耦合减少9dB以上。

This letter investigates a method to use the DGS to the dual-band antenna with high port isolation. This du- al-band DGS structure consists of two rectangular codirectional Split rings resonator and locates between two patches, the pa- rameters of the DGS is analyzed. The dimension of each ring controls the corresponding resonant frequency. Measurement and simulated results confirm the improvement of isolation between the antennas at the radiation frequency of 2.3/4 GHz when the DGS is utilized. The measured isolation of antenna with DGS has obviously improved more than 9dB by this method in two operating bands.