一种小型化宽带高增益Metamaterial贴片天线

Miniaturized broadband and high gain metamaterial patch antenna

利用Metamaterial概念,通过在天线贴片和接地面上分别蚀刻周期互补开裂环和条形缝隙图案,设计制作了一种小型化宽带高增益贴片天线.相比初始天线,新天线谐振中心频率降低了36.4%,带宽从2.9%扩展到39.9%,并且有低的电压驻波比.实验结果与仿真结果有较好的一致性.同时由于Metamaterial结构的左手特性影响了天线介质基底的等效媒质参数,这导致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.

A miniaturized broad bandwidth and high-gain patch antenna is designed and fabricated using the metamaterial concept via the periodically loaded complementary split-ring resonators（CSRRs） on the upper patch and strip-line gaps on the bottom ground plane, respectively. The novel antenna has a much lower resonant center frequency which is obviously reduced about 36.4%, a wider bandwidth which is significantly broadened from about 2.9 % to about 39.9%, and also a lower voltage standing wave ratio than the original antenna. Experimental data show a reasonably good agreement between the simulation and measured results. Also, due to the left-handed characteristics of the metamaterial, the effective medium parameters of the substrate of the antenna are affected, which induces the strongest radiation in the horizontal direction instead of the vertical direction of the conventional patch antenna.