Radiation pattern analysis of reflector antennas
Radiation pattern analysis of reflector antennas
复制标题
反射面天线的辐射方向图分析
DOI：
10.1002/ecja.4410680411
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
M. Ando
中科院分区：
文献类型：
--
作者：
M. Ando
本文提出了一种精确计算反射面天线从主波束方向到离轴区域的全角度范围内辐射方向图的方法。该方法的原理类似于物理光学衍射理论，是用几何衍射理论计算的边缘电流的贡献对常规物理光学的结果进行修正而得到的。然而，边缘电流通过由外围线和每个边缘点处的镜法线定义的局部坐标系以及参考该坐标系的入射电磁矢量分量以简单形式表示。因此，可以使用任意图案来处理任意形状的镜面和具有初级辐射器的天线。结果表明，在主光束附近，用本方法得到的结果接近物理光学方法得到的结果，在离轴处，用几何衍射理论得到的结果也接近物理光学方法得到的结果。准确性进行了测试，通过应用本方法的衍射问题，从一个圆盘，存在一个严格的解决方案。目前的方法使得不必要的物理光学（主光束）和衍射（离轴）的几何理论的使用到目前为止，以经验的方式进行的区别。可以系统地获得第一至第三旁瓣附近的图案，其中可以连接两种方法。
A method is proposed for accurately calculating the radiation pattern of reflector antennas in the entire angular range from the main beam direction to the off axis region. The principle of the method is similar to the physical optics diffraction theory, and consists of the result obtained by conventional physical optics corrected with the contribution from the edge current calculated by the geometrical theory of diffraction. However, the edge current is expressed in a simple form by means of a local coordinate system defined by the peripheral line and the mirror normal at each edge point and of the incident electromagnetic vector components in reference to this coordinate system. Therefore, it is possible to treat an arbitrarily shaped mirror surface and an antenna with a primary radiator using an arbitrary pattern. It is confirmed that the results obtained by the present method approach those obtained by the physical optics method near the main beam and those obtained by the geometrical theory of diffraction at the off axis. Accuracy is tested by applying the present method to the problem of diffraction from a circular disk for which a rigorous solution exists. The present method makes unnecessary the distinction of the use of physical optics (main beam) and the geometrical theory of diffraction (off axis) performed so far, in an empirical manner. It is possible systematically to obtain the pattern near the first-third side lobes where two methods may be connected.