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利用超材料概念,通过在接地面上蚀刻条形缝隙图案,并引入“八木”天线中的反射器和引向器的设计思想,设计并且制作了一种超宽带强定向型贴片天线.仿真结果表明,天线相对带宽为65.3%(6.9—13.6 GHz),带内回波损耗均在-10 d B以下,整个频段内天线的增益均在4.4 d Bi以上.由于接地板上蚀刻的超材料结构的左手特性影响了天线介质基底的等效媒质参数,天线电磁场的传播方向被改变,天线辐射场主要集中在水平方向而不是传统贴片天线的垂直方向.在传统的贴片天线上引入反射器和引向器增强了天线的方向性.实验结果与仿真结果有较好的一致性.
Using the concept of metamaterials, we designed and fabricated an ultra-wideband and highly-directional patch antenna by etching the strip pattern on the ground and introducing the reflector and director of the “Yagi” antenna The simulation results show that the relative bandwidth of the antenna is 65.3% (6.9-13.6 GHz), the in-band return loss is below -10 d B, and the gain of the antenna is above 4.4 d Bi in the whole frequency band. The left hand characteristics of the metamaterial structure affect the equivalent medium parameters of the antenna medium substrate, the propagation direction of the electromagnetic field of the antenna is changed, and the antenna radiation field is mainly concentrated in the horizontal direction instead of the vertical direction of the traditional patch antenna. The introduction of reflectors and directors enhances the antenna directivity.The experimental results are in good agreement with the simulation results.