一种基于超介质的超宽带天线设计

Ultra-Wideband Zntenna Design based on Metamaterial

提出一种基于超介质加载的超宽带天线.超介质结构由提供负介电常数的电容加载带(CLS)和提供负磁导率的开口谐振环(SRR)共同构成.针对原始窄带微带天线的特性,使用电磁仿真软件HFSS对超介质进行结构设计,使其能够在超宽带频带内产生均匀分布的多谐振点.对超介质进行电磁参数提取,其同时实现双负特性.研究超介质加载个数对展宽天线带宽的影响,确定加载个数.对天线进行辐射贴片开槽、缺陷地处理,实现多频带融合.最终设计的超宽带天线阻抗带宽达到2.89~12.07 GHz,相对带宽达到127.72%,是原始天线的54倍.对天线进行制作,实测结果与仿真结果基本吻合.

An ultra-wideband antenna based on metamaterial is proposed.The metamaterial structure is com-posed of a capacitively loaded strips(CLS)that provides a negative permittivity and an split ring resonators(SRR)that provides a negative magnetic permeability.For the characteristics of the original narrow-band mi-crostrip antenna,the magnetic simulation software HFSS is used to design the metamaterial to make it possible to generate uniformly distributed multiple resonance points in the ultra-wideband frequency band.The electro-magnetic parameters are extracted from the metamaterial,which simultaneously achieves double negative char-acteristics.The influence of the number of metamaterial loading on the bandwidth of the widened antenna is studied,and the number of loads is determined.The radiation patching and defect processing are performed on the antenna to realize the multi-band fusion.The final design of the ultra-wideband antenna has an imped-ance bandwidth of 2.89-12.07 GHz and an relative bandwidth of 127.22%,which is 54 times that of the o-riginal antenna.The antenna is prepared,and the measured results are basically consistent with the simulation results.