摘要
基于一种电流探测的平面近远场变换方法，采用负载50n的偶极子探头在天线近场探测电场得到感应电流，合理设置近场和等效面的采样间隔，利用Galerkin型矩量法，将辐射电场积分方程转化成循环Toeplitz块矩阵方程。利用共轭梯度法和线性卷积计算求出天线口径面等效磁流分布。最后，根据天线口径面等效磁流分布计算出天线远场方向图分布。通过与天线仿真数值对比验证，天线平面近场电流探测可以快速准确求得天线前向辐射远场；同时，在满足奈奎斯特取样准则前提下，合理地增加采样点便可提高测量精度。综上所述，该方法具有较高的可靠性和实用价值。
A method for planar near-field to far-field transformation based on current detection is proposed. The method, to detect the inductive current in the near field of the antenna by using 50Ω dipole probe, and to convert the radiation electric field integral equation into the cyclic Toeplitz block matrix equation by setting the sampling interval between the near field and the equivalent surface reasonably, and using the Galerkin moment method. The equivalent magnetic flux distribution of the aperture surface of the antenna is obtained by using the conjugate gradient method and the linear convolution calculation. Finally, the far-field pattern dis- tribution of the antenna is calculated according to the equivalent magnetic flux distribution of the antenna surface. By comparing with the antenna simulation numerical results, the near-field current detection of the antenna plane can quickly and accurately ob- tain the far field of the antenna forward radiation. At the same time, it is only necessary to increase the sampling points to improve the measurement accuracy under the condition of satisfying the Nyquist sampling criterion. Therefore, the proposed method is very reliable and has practical value.
出处
《现代雷达》
CSCD
北大核心
2018年第3期58-62,共5页
Modern Radar
基金
国家自然科学基金资助项目(61601231)
江苏省自然科学基金资助项目(BK20140999)
江苏省气象传感网技术工程中心开放基金资助项目(KDXG1302)
关键词
电流探测
平面近远场变换
共轭梯度法
循环Toeplitz块矩阵
current detection
planar near-field to far-field transformation
conjugate gradient method
cycle Toeplitz block matrix
作者简介
高知明 男，1991年生，硕士研究生。研究方向为天线测量技术。;胡宁 男，1967年生，硕士，高级工程师。研究方向为测量技术。;周勇 男，1982年生，讲师。研究方向为天线测量技术和电磁波传播技术。通信作者：周勇Email：zhouyong@nuist．edu．cn;辛彪 男，1990年生，硕士研究生。研究方向为天线测量技术。
