双圆极化共形相控阵天线研究

Research of Dual Circularly Polarized Conformal Phased Array Antenna

设计了一种基于十字缝隙耦合双圆极化微带共形相控阵天线。首先设计了微带天线单元,分析了天线各结构参数对天线性能的影响。通过电桥向偏馈于十字缝隙上的馈线馈电,实现等幅、相差90°馈电,电桥的两个端口分别获得旋向相反的圆极化信号。然后对天线单元进行了测量,结果表明天线轴比小于3dB的带宽为16%,驻波小于1.5的带宽为17%,波束宽度大于87°。最后对5×5共形相控阵天线进行了仿真与测量,结果显示天线可以扫描60°,适合用作载体共形的卫星通信天线。

In the paper,a phased array antenna based on circularly polarized microstrip patch antenna coupled by cross slots is designed.Firstly,the microstrip patch antenna element is designed,and the relation between the performance and the parameters of the structure of antenna is analyzed.By use of a 90° coupler,the two feed lines feeding to the cross slots are fed by equal amplitude and 90° phase difference,and the two ports of the 90° coupler can get the dual circular signals with opposite Rotational Direction.Secondly,the antenna element is measured,and the results show that the antenna offers 16% bandwidth under axis ratio<3dB and 17% impedance bandwidth under VSWR<1.5,and the beamwidth is more than 87°.Finally,the conformal phased array antenna with the 5×5 array is simulated and measured,and the results show that the phased array antenna can scan to 60°,which can used as conformal satellite communication antenna.