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一、概述近年来,由于射电天文和雷达、通讯技术的迅速发展,天线的工作波长越来越短(已经进入毫米波乃至亚毫米波段),对于大中型天线来说.精度要求越来越高,因而,天线结构设计制造方面的难度也越来越大。为此,在天线结构设计中已普遍采用了“最佳吻合设计”、“预调角最优性能安装”以及“保型设计”等方法来提高天线反射体的精度,以满足电气性能要求。随着天线口径的增大和工作波长的缩短,平时一般不为人们注意的卡氏双曲副面的设计制造和主副面的位置匹配对天线总精度及其增益的影响也就越来越突出,这就是本文所要探讨的问题。副面尺寸的选定,与主面口径、焦距及其焦径比等几何参数有关,通常约为主面口径的
I. Overview In recent years, due to the rapid development of radio astronomy and radar and communication technology, the working wavelength of the antenna is getting shorter and shorter (has entered the millimeter-wave and sub-millimeter-wave band), and the requirements for large and medium-sized antennas are getting higher and higher , Therefore, the antenna structure design and manufacture of the difficulty is also growing. To this end, the antenna design has been widely used in the “best fit design”, “pre-setting angle optimal performance installation” and “Bao-type design” and other methods to improve the accuracy of the antenna reflector to meet the electrical performance requirements. With the increase of the aperture of the antenna and the shortening of the working wavelength, the influence of the design and manufacture of the Kabbah hyperbola on the other side and the matching of the positions of the main and the accessory on the overall accuracy and gain of the antenna are also more and more prominent This is the issue to be explored in this article. The size of the secondary surface is selected based on geometric parameters such as the primary aperture, the focal length and its coke-in-diameter ratio, and is usually about the diameter of the primary surface