平面相控阵天线的单元设计与分析

Design and analysis of units for planar phased antenna arrays

基于工作频率在1.79GHz的矩形微带天线,利用FDTD进行建模和仿真,设计出几种平面阵列天线。针对三角阵和矩形阵,分别计算了它们的远场辐射方向图,讨论了阵列天线单元分布的影响,对比分析了微带阵列天线的主要性能参数,计算了前后比和波瓣宽度,并得出了结论。仿真实验结果表明,和三角阵相比,使用4元矩形阵能提供较高的增益和较低的栅瓣电平。

Based on a 1.79 GHz microstrip rectangle antenna,by using FDTD to model and simulate,the planar antenna arrays are designed.Focused on the triangular array and the rectangular array,the far field radiation patterns of these arrays are calculated and the influence of the distribution of antennas is discussed.The main performance parameters of microstrip antenna arrays are compared and discussed.The front-to-rear ratio and the main lobe width of the antenna arrays are calculated.The simulation results show that the rectangular array with four elements has higher antenna gain and lower grating lobes,compared with the triangular array.