高频电磁波在有损地面上的传播特性

对于架设在复杂环境的高频天线，用矩量法等算法计算环境对电磁波传播特性的影响非常困难，而了胡着高频技术的发展，这一现实问题迫切需要得到解决，本文利用时域有限差分法（FDTD）对这类问题进行了分析计算，文章计算了架设在海岸边的天线，其辐射的电磁波经过一段有损陆地后，远区电磁场的变化特性，由于存在不同介质的界面，在计算中引入了表面阻抗法概念，提高了运算程度。

Transmission Characteristics of HF Electromagnetic Wave on Lossy Ground

It is very difficult with MOM to calculate radiation and transmission characteristics of a high frequency antenna in complex environment. With the development of high frequency technology, the problems are eager to be solved. In this paper, finite difference time domain method is used for the problems. The radiation characteristics of a monopole antenna on lossy ground is calculated. The analysis shows that the radiation characteristics of the electromagnetic wave are varied with the length of loss ground. The concept of surface impedance is used , which greatly reduces the computation capacity and memory space .