一种新型宽带定向性贴片天线设计

Design of a novel wideband directivity patch antenna

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.

A wideband strong-directivity patch antenna is designed based on the metamaterial concept on the ground plane and the Yagi antenna concept of reflector and director. Due to the fact that the effective medium parameters of substrate of antenna are affected by the left-hand characteristics, the wave propagation direction of antenna is changed, which induces the strongest radiation in horizontal direction rather than the vertical direction of the conventional patch antenna. The reflector and director induce a directivity of the radiation. The simulation results show that the relative bandwidth of the designed antenna is 65.3%（6.9–13.6 GHz）, the return loss is less than-10 dB, and the average gain is over 4.4 dBi in the operating range. Experimental results are in good agreement with the simulation results.