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一、前言本文第一部分阐述了近场测量方法对今后卫星天线测量的实际必要性;讨论了平面极坐标扫描的近场测量方式。利用罗仑芝(Lorentz)互易原理和雅可比—贝塞尔级数展开的计算方法建立了近—远场变换的数学模式;并列出了一种应用微型计算机程控的平面近场自动测量系统。前面这些讨论仅从理想化的情况研究了平面近场测量的问题。这当中隐含着以下的假定:
I. Preface The first part of this article describes the practical necessity of near-field measurement for satellite antenna measurements in the future; and discusses the near-field measurement of polar coordinate scanning. The mathematic model of near-far-field transformation was established by using the reciprocity principle of Lorentz and the Jacobian-Bessel series expansion method. An automatic planar near field measurement system using microcomputer was also presented. The foregoing discussion addresses the issue of planar near-field measurements only from idealized conditions. This implies the following assumptions: