偏置抛物面天线的空域瞬态极化特性及仿真分析

Study on Spatial Instantaneous Polarization Characteristics of Offset Paraboloid Reflector Antenna and Simulation Analysis

在天线空域瞬态极化特性的表征的基础上,研究了偏置抛物面天线在雷达坐标系下的天线主极化和交叉极化方向图,探讨了利用天线主瓣内和主瓣外扫描时不同方位和俯仰向上的空域极化特性,充分诠释了天线极化状态的变化规律。通过计算机仿真和分析比较,结果表明,在空域指向的不同位置,不同的尺寸和不同的焦径比的影响下,天线的极化特性服从一定规律变化,有共性也有差异,这对天线空域极化特性的应用提供了理论依据和支持。

Based on the definition and description of the spatial instantaneous polarization characteristics of antenna, the main and cross polarization pattern of offset paraboloid reflector antenna is studied in radar coordinate system. The Spatial polarization characteristics of main and side lobe of scanning antenna in different azimuthal and elevational direction are researched. The variation regular of antenna polarization states is fully introduced. Conclusion was obtained that the spatial polarization characteristics of paraboloid re- flection antenna is changed with some rule which is in different ratio of the paraboloid focal distance to its open diameter and different dimension. The generality and difference among each kind were found on the basis of the experimental results. It provides theoretical base and support for the application of the spatial polarization characteristics of the antenna.