A broadband circularly-polarized microstrip antenna with single feed is proposed and designed. Stacked double-layer rectangle microstrip patch is applied to acquire better bandwidth by the resonance with a coupling between the patches, and meanwhile the performance of higher gain and wider bandwidth is achieved. Commercial software HFSS is used for optimizing the parameter of antenna. Simulation results indicate that the antenna has an impedance bandwidth of 10% (VSWR≤2) and a fairly good axial ratio when working at L band, and in the whole range of the bandwidth, the gain and radiation patterns could maintain fairly good consistency.%设计了一种单点馈电的宽带圆极化微带天线。针对微带天线带宽窄的问题，采用双层矩形贴片的层叠结构，通过辐射贴片之间的谐振耦合使天线的频带展宽，得到了良好的效果。在保证天线增益性能的基础上，增加了天线圆极化带宽。采用商用仿真软件HFSS对天线结构尺寸进行了优化设计，仿真结果显示，该天线工作于L波段时，VSWR＜2的阻抗带宽达到10%，轴比特性良好，且在整个带宽范围内，天线增益和辐射方向图保持良好的一致性。
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