双镜面天线的近远场研究

A Study on Near and Far Field of a Dual-shaped Reflector Antenna

本文用SWEGTD法研究了双镜面天线在任意距离的辐射场。实际计算了一个赋形卡塞格伦天线的近、远场,理论值与实测值吻合良好,得出一些关于轴对称双镜天线辐射场的有意义的新结论。此外,提出了一种精确计算天线附近灾害场值的新方法,据此计算的天线禁区远比其他方法的小。这对解决与天线有关的电磁兼容问题非常经济有效。

The study of the radiation field at any distance of a dual-shaped reflector antenna is presented, and as an example, near and far field of a dual-shaped Cassegrain antenna is calculated. The computational results show good agreement with the measured data. Therefore, a new conclusion about dual reflector antenna is obtained. Besides, a new method to calculate accurately disastrous field value round an antenna is given. It is an effective technique for solving electromagnetic compatibility (EMC) problem related to an antenna.