一种基于超材料的小型化宽带微带天线

摘要

分别将创新设计的“正方形”和“四方形”超材料单元刻在普通微带天线的辐射贴片和接地板上，设计了工作在3.66GHz-14.42GHz的一种小型化宽带高增益微带天线。与原始的天线相比，新型天线的谐振中心频率降低了34.8%，相对带宽从3.76%扩展到229.9%，同时保持了良好的增益。实物测试结果与仿真结果吻合较好。因为超材料的左手传输特性影响了微带天线介质基板的等效媒质参数，导致天线的辐射场主要集中在水平方向，而不是传统的微带天线的垂直方向。%The novel designed“square”metamaterial units were etched on upper patches with ordinary microstrip antenna and the bottom ground plane, respectively,thus working out a miniaturized broadband high-gain microstrip antenna working under 3.66GHz-14.42GHz.Compared with the original antenna,the resonance center frequency of the new antenna is decreased by 34.8%;the relative bandwidth is expanded to 229.9% from 3.76% while favorable gain is maintained.The material test results and the simulation results are in line with each other.The performance improvement is attributed to the fact that the left-hand transmission features of metamaterial affected the equivalent medium parameters of the microstrip antenna dielectric substrate,and the radiation field of the antenna concentrates on the horizontal direction rather than the vertical direction for traditional bandwidth antenna.