摘要
基于等效磁流法,文中开展了平面天线近远场变换方法的研究。为了减少近场测量时长、提高近场测量效率,研究中只需天线E面和H面对应的两个正交近场切面的电场分布,根据电场积分方程(EFIE),利用矩量法(MOM)建立近场与等效磁流的矩阵方程。引入共轭梯度(CG)法,结合迭代法计算出待测天线口径面x方向和y方向的切片等效磁流分布,根据格林公式反演出相应的E面和H面远场方向图。经过前馈抛物反射面天线和螺旋天线的仿真验证,反射面天线E面和H面的反演结果吻合度分别达到120°和130°,螺旋天线E面和H面的反演结果吻合度分别为80°和100°,表明结果具有良好的一致性,可以应用于天线近场测量。
Based on the equivalent magnetic current method,the planar near⁃field far⁃field transformation is studied.In order to tremendously reduce testing time and improve the efficiency of near field measurement,only two orthogonal slices of near⁃field corresponding to antenna pattern with E⁃plane and H⁃plane are measured instead of all the near field.With the two slices of near⁃field data,the equivalent magnetic current distribution on the source plane is obtained using an Electric Field Integral Equation(EFIE).Method of Moments(MOM)procedure is used to get the matrix equation.The Conjugate Gradient(CG)method and iteration method are employed to solve the matrix equation.The antenna pattern in H⁃plane and E⁃plane is calculated through equivalent magnetic current.The simulation verification is made for front feed parabolic reflector antenna and helix antenna.The calculated antenna pattern of E⁃plane and H⁃plane for the front feed parabolic reflector antenna agrees with the ideal one within 120°and 130°respectively,and the corresponding agreement angles of helix antenna are 80°and 100°.It indicates that the method has high precision and is applicable to antenna near field measurement.
作者
梁鑫
周勇
喻程
LIANG Xin;ZHOU Yong;YU Cheng(School of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;Nanjing Vocational College of Information Technology,Nanjing 210023,China;Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,Nanjing University of Information Science and Technology,Nanjing 210044,China)
出处
《电子设计工程》
2021年第18期1-5,共5页
Electronic Design Engineering
基金
国家自然科学基金资助项目(61601231)。
关键词
近场-远场变换
等效磁流法
测量效率
共轭梯度法
near⁃field far⁃field transformation
equivalent magnetic current method
measuring efficiency
conjugate gradient method
