模式匹配法分析有限圆盘地面单极天线

本文给出了一种严格分析有限尺寸圆盘地面单极天线的新方法———模式匹配法 .该方法通过在天线上、下两边平行放置两个无限大良导电平面 ,以及合理划分区域 ,使得每个分区中的场分量能够采用柱谐展开式解析表示 ,且展开系数由导体表面边界条件及分区交界处场分量连续条件加以确定 .在此基础上 ,进一步分析天线的输入阻抗等电性能 .计算结果表明 :对不同尺寸圆盘地面单极子天线 ,理论分析与文献中的实验结果均十分吻合 .同时 ,由于场量的解析表示 ,使得计算速度较快

Analysis of Monopole Antennas on Circular Disk Using Mode Matching Method

A new method,mode matching,is presented for the analysis of monopole antennas on a circular disk.This approach is facilitated by placing two parallel PEC grounds above and below the antenna and dividing the space into several subregions reasonably,thus allowing use of cylindrical harmonic expansions in each subregion.Then expansion coefficients are found by enforcing the PEC boundary condition and continuity condition at the regional boundary surface.The current and input impedance of monopole antennas on disk is computed based on the above calculation.For monopole antennas with different circular disc in radius,this method can lead to very good agreements between the theoretical results and the experimental results available in literatures.In addition,this method is efficient since the fields are expressed in closed form.