一种微带线馈电的宽带圆极化微带天线的设计

摘要

The broadband circularly polarized microstrip antenna with microstrip feeding is presented,which consists of mi⁃crostrip feeder,radiation patch and FR4 dielectric⁃slab. The requirements of microstrip antenna circularly polarized are realized by adding two annular slots which are located at the two opposite angles of rectangular slot on radiation patch. The axial⁃ratio bandwidth of the antenna is improved effectively by adjusting the size of microstrip feeder. The axial⁃ratio bandwidth can reach 43.8%(2.5~3.9 GHz).%提出一种微带线馈电的宽带圆极化微带天线，它由微带馈线、辐射贴片和FR4介质板组成，在辐射贴片的矩形槽对角添加两个环形结构，实现了微带天线圆极化的要求，通过调整微带馈线的尺寸，有效改善了天线的轴比带宽。该天线单元的轴比带宽达到了43.8%（2.5~3.9 GHz）。