【作者】 王鹏；

【导师】 谢拥军；

【作者基本信息】 西安电子科技大学 ， 电磁场与微波技术， 2006， 硕士

【摘要】 本文采用矩量法(MoM)分析分层介质中的电磁场问题。推导了位于分层介质中的电偶极子和磁偶极子的矢量位和标量位格林函数，并采用二级离散复镜像方法计算了格林函数，得到了简洁闭式。将格林函数应用于矩量法中，首先分析了平面微带电路，提取出电路的网络参数。结合网络分析方法对带有垂直接地结构的微带电路进行全波分析。将垂直接地结构用边端口代替，将原电路等效成只有平面结构的广义多端口模型。在分析平面微带电路的基础上，分析了封装微带结构特性，利用镜像原理通过修正阻抗矩阵来移除封装的边壁效应。作为分层介质的一种应用，本文分析了半空间中的粗糙海面上金属目标的雷达散射特性。将海水视为下半空间媒质，采用Monte Carlo方法生产的粗糙海面视为位于上半空间中的介质表面。通过建立半空间中的介质和金属混合目标的积分方程，并采用迭代方法求解矩阵方程以得到该模型的散射特性。更多还原

【Abstract】 Some electromagnetic problems in the multilayered media are analyzed using the Method of Moment (MoM) in this paper. The Green’s functions of the electrical dipole and magnetic dipole lying in the multilayered media are given and calculated by the two level approximations discrete complex image method. So the Green’s functions can be written as the closed forms. Using them in MoM, we analyzed the planar microstrip circuits at first and extract the network parameters of the circuits. Together with network analysis method, the microstrip circuits with via grounding structures are analyzed. Replacing the via grounding structures and substituting the edge ports for them, the original circuits could be equivalent to the generalized multiport models with only planar structure. Based on the planar microstrip circuits, the enclosed microstrip structure is analyzed and the package effects are removed by modifying the impedance matrix by the images theory. As an application of the multilayered media, the electromagnetic scattering characteristic from the 3D conducting object above the random ocean-like rough surfaces is also evaluated. The water sea could be regarded as the half low space medium and the sea rough surfaces could be regarded as the dielectric surfaces above the sea. The scattering characteristic of this model is calculated by establishing the integral equation of the combined conducting/dielectric objects and solving the matrix equation with the iteration method.更多还原