如何快速而准确地评估天线阵面结构变形对电性能的影响是工程上亟需解决的关键问题.文中根据某大型相控阵天线设计了3种规格的阵列天线,按照典型的天线阵面碗状变形,分别采用HFSS数值计算方法和有源阵元方向图(Active Element Pattern,AEP)计算方法计算阵元Z向误差和指向误差对电性能的影响.结果表明:当Z向偏差小于λ/20(λ为波长)时,碗状变形对副瓣电平和波束宽度的影响显著,对增益影响较小;当Z向偏差增大到λ/20时,天线增益明显恶化;随着阵元规模的增大,得益于阵元互耦效应,碗状变形对电性能的影响减弱.AEP计算方法忽略了阵元方向图的差异性及互耦效应,导致其计算精度不如HFSS数值计算方法的计算精度高,特别是副瓣计算结果差异明显.该研究可为相控阵天线结构设计参数的确定提供指导.
Analysis of Effect of Bowl-shaped Deformation on Radiation Performance of Phased Array Antenna
How to evaluate quickly and accurately the effect of antenna array structure deformation on electrical performance is an urgent key problem to be solved in engineering.In this paper three kinds of antenna arrays are designed based on a large phased array antenna.Typical antenna array bowl-shaped deformation is employed and the effect of Z-direction error and pointing error on electrical performance is calculated with HFSS numerical calculation method and active element pattern(AEP)calculation method.The results indicate that when the Z-direction error is less than λ/20(λ is wavelength),the bowl-shaped deformation has a significant effect on sidelobe level and beam width,but has minimal effect on gain;when the Z-direction error increases to λ/20,the antenna gain is significantly degraded;as the size of the array element increases,the effect of bowl-shaped deformation on electrical performance diminishes due to mutual coupling effects.AEP calculation method ignores the differences of element patterns and mutual coupling effects,which leads to less accurate results than those obtained using HFSS numerical calculation method,especially the sidelobe calculation result.This study can provide guidance for determining phased array antenna structural design parameters.
phased array antennaHFSSactive element pattern(AEP)gainelectromechanical coupling
万方数据
维普
