【摘要】 采用物理光学法分析了二维带罩相控阵天线的远区辐射方向图。首先用解析法计算了阵列天线的辐射场,与天线罩壁的局部平板等效,按照物理光学法计算出天线罩外壁上的切向场和等效电磁流,由三维电磁流辐射公式推导出其二维辐射积分公式,用表面积分法得到天线通过天线罩传输的远区辐射场。数值仿真验证了算法的准确性和有效性,并分析了改变天线激励相位和天线罩本身参数对天线辐射特性的影响。更多还原

【Abstract】 The radiation characteristic of a two-dimensional radome-enclosed phased array antenna based on physical optics is studied in this paper.The radiation field of the antenna is calculated using analysis method first.Under assumptions of locally planar radome surface,the tangent electromagnetic field and the equivalent electric and magnetic currents on the radome outer surface are calculated according to the physical optics.The 2D integral formulas of radiation of the equivalent currents are deduced from the 3D formulas and the surface-integration method is employed to obtain the far-field radiation formulation for the radome-enclosed antenna finally.Numerical examples validated the accuracy and efficiency of the offered method.Based on this,the effects on the antenna radiation characteristics caused by changing the antenna’s phase excitation and radome parameters are also calculated and analyzed.更多还原