基于超材料的宽带高增益低雷达散射截面天线

Broadband high gain and low RCS metamaterial patch antenna

利用超材料概念,通过在天线贴片和接地面上分别蚀刻周期互补三角形电磁谐振单元(CTER)和条形缝隙图案,在低介电常数薄介质基板上设计并且制作了一种宽带高增益低雷达散射界面(RCS)贴片天线。仿真分析表明:由于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。相比初始天线,新天线相对带宽从2.9%扩展到64.5%,并且有低的电压驻波比;在工作带宽内,天线鼻锥方向低雷达散射界面都有5dB以上的减缩,最大减缩22dB.实验结果与仿真结果有较好的一致性。

Based on the metamaterial concept,a broad bandwidth high-gain and low radar cross section（RCS） patch antenna was designed and fabricated on the thinner substrate with the lower permittivity.The periodically loaded complementary triangular electromagnetic resonator（CTER） on the upper patch and strip-line gaps on the bottom ground plane were etched,respectively.Simulated analysis demonstrates that,due to the left-handed characteristics of metamaterial,the effective medium parameters of substrate of antenna are affected,the wave propagation direction of antenna is further altered which induces the strongest radiation in horizontal direction instead of the vertical direction of the conventional patch antenna.Compared with the original antenna,the novel antenna has a wider bandwidth significantly broadened from about 2.9% to about 64.5%,and also a low voltage standing wave ratio;the antenna has the lower RCS reduced above 5dB within the whole operation bandwidth at boresight direction,and the most reduction 22dB is obtained.Experimental data show good agreement between the simulation and measured results.