分析和设计了一种采用双F型馈电探针结构的宽带圆极化微带天线。天线采用Wilkinson功分移相器形成两路幅度相等、相位差90°的信号,通过两根F型馈电探针对空气介质层上方的方形贴片进行正交耦合馈电来实现圆极化。仿真结果表明:该天线能够实现67.2%的阻抗带宽(VSWR<2)以及29.3%的3 dB轴比带宽,具备良好的宽带圆极化和宽角扫描特性,并且,天线的剖面高度仅为0.09λ0(λ0为中心频率对应波长),具有广阔的应用前景。

A design of broadband circularly-polarized microstrip antenna based on dual F-probe feeding is proposed . The Wilkinson power divider produces two signals which have same amplitude and 90° phase difference to realize circular polarization. Two F shaped probes are used to feed the patch upper the air layer. The simulation results show that the antenna achieves 67.2% impedance bandwidth (VSWR<2)and 29.3% 3 dB axial ratio bandwidth. Thus this antenna achieves wide-band circular polarization and wide-scan performance. Furthermore, profile height of the antenna is only 0.09λ0(λ0 is the wavelength of central frequency). As a result, the antenna can be widely used.

TN821+.1