环形微带聚焦天线阵列的性能优化

摘要

基于无线能量传输效率优化理论，研究了环形聚焦天线阵列的6种拓扑结构，分析了它们的性能和影响性能的因素，发现中央单元会提高传输效率而减小聚焦距离，第2环单元对传输效率和焦距大小有很重要的贡献，但增加第2环的天线数目对性能无影响，增大口径会提高聚焦距离和旁瓣电平。最终设计了一种工作在2．45 GHz 的16个微带天线单元的环形聚焦天线阵列。设计结果显示，该天线阵列具有高传输效率、低旁瓣，以及聚焦距离更加精确的优点。%Six topology structure of circular focused antenna array designed based on the wireless power transmission efficiency op-timization theory is analyzed and presented.The central element raises transmission efficiency and reduces focal distance,and the second ring raises both transmission efficiency and focal distance.Increasing the element number of the second ring does not im-prove the antenna performance while increasing the ring diameter could raise both focal distance and side lobe level.A 4 × 4 fo-cused microstrip antenna array working at 2.45 GHz is designed to verify the proposed design method.The result shows this an-tenna array has high transmission efficiency,low side lobe level and exact focal distance.