Novel Gaussian beam method for the rapid analysis of large reflector antennas
Novel Gaussian beam method for the rapid analysis of large reflector antennas
复制标题
DOI：
10.1109/8.931145
复制
发表时间：
2001-06
影响因子：
5.7
通讯作者：
H. Chou;P. Pathak;R. Burkholder
中科院分区：
文献类型：
--
作者：
H. Chou;P. Pathak;R. Burkholder
开发了一种利用高斯光束 (GB) 的相对快速且简单的方法，当大型反射器天线被已知辐射方向图的馈源照射时，只需在工作站上花费几秒钟即可计算大型反射器天线的近场/远场。这种 GB 技术速度很快，因为它完全避免了大型反射器表面上的任何数值积分，而这种积分在此类天线的传统物理光学 (PO) 分析中是必需的，并且在工作站上可能需要几个小时。具体来说，已知的馈电辐射场由一组相对较少的、旋转对称的GB来表示，这些GB从馈电平面径向发射并且具有几乎相同的束间角间距。这些GB从它们被反射的地方撞击反射器表面，并且还被反射器边缘衍射； Chou 和 Pathak (1997) 开发了由从任意方向（但不接近掠射）的一般像散入射 GB 照射的反射器反射和衍射的场的表达式，并在本工作中使用。数值结果说明了该 GB 方法在用于分析具有单馈源或阵列馈源的一般偏置抛物面反射器以及用于分析非抛物面反射器（例如椭圆形甚至一般形状表面所描述的反射器）时的多功能性、准确性和效率。
A relatively fast and simple method utilizing Gaussian beams (GBs) is developed which requires only a few seconds on a workstation to compute the near/far fields of electrically large reflector antennas when they are illuminated by a feed with a known radiation pattern. This GB technique is fast, because it completely avoids any numerical integration on the large reflector surface which is required in the conventional physical optics (PO) analysis of such antennas and which could take several hours on a workstation. Specifically, the known feed radiation field is represented by a set of relatively few, rotationally symmetric GBs that are launched radially out from the feed plane and with almost identical interbeam angular spacing. These GBs strike the reflector surface from where they are reflected, and also diffracted by the reflector edge; the expressions for the fields reflected and diffracted by the reflector illuminated with a general astigmatic incident GB from an arbitrary direction (but not close to grazing on the reflector) have been developed in Chou and Pathak (1997) and utilized in this work. Numerical results are presented to illustrate the versatility, accuracy, and efficiency of this GB method when it is used for analyzing general offset parabolic reflectors with a single feed or an array feed, as well as for analyzing nonparabolic reflectors such as those described by ellipsoidal and even general shaped surfaces.