【摘要】 利用高阻抗表面的同相反射特性,将其加载到阿基米德螺旋天线背腔的边缘区域,从而改善了天线增益,实现低剖面设计。仿真结果显示,与传统背腔式螺旋天线相比,增益稳定性显著提高。在3~12 GHz的工作频段内,驻波比小于2,阻抗匹配良好,辐射方向图保持稳定。在约7.8 GHz的频带宽度内轴比小于3 dB,实现了较好的圆极化性能。更多还原

【Abstract】 Based on the in-phase reflection characteristic,the high impedance surfaces are placed on the edge region of Archimedean spiral antenna backed cavity to improve the antenna gain and realize low-profile design. The results of simulation show that the stability of gain is enhanced significantly compared with traditional cavity-backed spiral antenna. The VSWR is smaller than 2 in the work frequency from 3 GHz to 12 GHz,so the impedance matching is proper,and the radiation pattern remains stable. The axial ratio is less than 3 dB when in the bandwidth of 7.8 GHz,so that circularly polarized wave can be achieved.更多还原