电磁异向介质在阵列天线中的应用研究

Application of metamaterials in antenna array

为了抑制阵列天线单元的表面波,并减小阵元间的耦合效应,研究了电磁异向介质材料在抑制阵列天线互耦效应中的应用.基于开口谐振环(Split-Ring Resonator,SRR)负媒质材料特性,将SRR结构单元加载于阵列天线之中,提出了具有互耦抑制效应的天线设计方法.仿真结果表明:加载SRR结构单元后,天线谐振工作频点处的耦合系数降低了8.8dB,即由原来的-16.3dB降低到了-25.1dB,而对天线阵列的增益和方向图没有太大的影响,可以满足工程的基本要求.为设计低耦合的微带阵列天线提供了理论支持.

In order to restrain the surface wave and reduce the coupling effects of the antenna array elements, the application of metamaterials in the antenna design is studied for restraining the coupling effects. The split ring resonator （SRR） units are loaded at the antenna arrays, and the design method to set negative materials in the antenna array for restraining coupling effects is proposed based on the characteristics of SRR. From the simulation results, it shows that the loaded SRR unit could make the coupling coef- ficient reduced 8.8 dB at the resonance frequency of the antenna array, i. e, the coupling coefficient is reduced to-25.1 dB from--16.3 dB. But it does not cause even effects to the gain and direction pattern of the antenna array, and these parameters could meet the engineering requirements. The research offers the theory sustaining to the design of low coupling antenna arrays