摘要
本文提出了一种利用级联结构改善超宽带天线阵互耦和带宽的方法。针对阵元间距1/3波长的二元平面单极子天线阵耦合较差的4GHz和6GHz,设计了两种不同结构的电磁带隙结构,并将其级联应用于天线阵中。仿真结果表明:加载后天线工作带宽为3.71-7.02GHz,带宽展宽13.7%,互耦在整个频带内均低于-10d B,其中4GHz和6GHz耦合均降低了25d B以上。因此级联EBG结构加载于超宽带天线阵中不仅可以抑制耦合,同时可以展宽带宽。
A cascaded method is used in the ultra-broadband antenna array to accomplish coupling suppression and wide band. The distance between two monopole antenna array is about 1/3wavelength. Because of severely deteriorated mutual coupling at 4GHz and 6GHz, two different electromagnetic bandgap structures(EBG) were designed and cascaded to reduce the mutual coupling. Simulation results indicate that the working bandwidth is from 3.71 GHz to 7.02 GHz by using the cascaded structure. The relative bandwidth is broadened about 13.7%. During the whole working band the mutual coupling is below-10 d B. The S21 is greatly decreased about 25 d B at 4GHz and 6GHz. Therefore,using the cascaded EBG structure can reduce the mutual coupling and broaden relative bandwidth at the same time.
引文
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