多层电厚微带天线的阻抗特性

本文提出了一种多层介质电厚微带天线的一种分析方法。从无界空间中的电并矢格林函数出发,导出了分层介质中任意一点具有任意取向的水平电偶极子场的表达式。以此为基础,利用Richmond反作用积分方程,建立了关于贴片上电流分布的积分方程。通过适当选取电流基函数,使本方法适用于电厚介质微带天线。应用Galerkin方法建立矩阵方程。借助于计算机求解该矩阵方程,可得到天线的各项特性。文中用实例进行了验证。

INPUT IMPEDANCE OF MICROSTRIP ANTENNA WITH THICK MULTILAYER SUBSTRATE

A new method is presented to analyze the multilayer electrically thick circular microstrip antenna excited by a probe. The current on the probe is taken to be uniform. Based on free space electric dyadic Green's function, the field expression of a horizontal electric dipole (HED), which is located in any point of multilayer media and in any direction, has been derived. By using this field expression and Richmond reaction equation, an integral equation of electric current on the patch is formulated. By properly choosing basic function for current expansion, this method can be used for an electrically thick microstrip antenna. The theoretical results are very agree with experimental data for an electrically thick circular micro-strip antenna with an air gap.