线面结构天线的电磁建模与计算

Electromagnetic Modeling and Calculation of Line-Surface Antenna

应用矩量法对线面结构的天线进行建模,针对天线中的不同结构,选用了不同的基函数进行建模,对于线结构和面结构,分别采用了经典的三角形基函数和RWG矢量基函数。而对于线面结合处这一复杂结构,在分析传统线面基函数表达式的基础上推导出一种新的基函数,该基函数中增加了描述天线粗细的项,且其散度为一常数,避免了复杂的差分计算,有效解决了传统线面结合基函数分析粗天线模型时误差大且存在奇异点的缺点。在此基础上,给出了线面结构天线阻抗矩阵及散射场的计算方法。最后通过两个天线的算例验证了该算法的正确性和通用性。

Method of moments is applied in line-surface antenna＇ s modeling. According to different antenna structure, different basis functions are chosen. The triangle basis function and the RWG vector basis function are used in the line and the surface structures. Based on the analysis of the traditional line surface basis function expression, a new kind of basis function is deduced for the line-surface structure. The description of the antenna thickness is increased in the new function. It effectively solves the shortcomings of the great errors when using the traditional basis function to analyze the coarse antenna. Based on this, the line-surface shape antenna impedance matrix and the calculation method of scattering field are given. Finally the correctness of the algorithm is verified through the analysis of monopole antenna in limited plane and arbitrary angle butterfly antenna.