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本文讨论了线源对抛物柱面偏焦馈电的几何光学性质,提出了一种判断最优化的几何光学评价函数,计算了最优馈源位置随天线口径尺寸和波束指向角变化的规律。当平行射线斜投射于抛物柱面时,有散焦现象,存在散焦线。本文给出了散焦线的参数方程,由此找到了天线口径尺寸逐渐变小时的最优馈源位置的极限位置。利用标量绕射理论计算了若干典型情况的辐射波瓣图。计算结果表明,几何光学评价函数对工程实际问题是可用的。
In this paper, we discuss the geometrical and optics properties of the line-source focusing on the parabolic cylinder focusing feed, and propose a judging and optimizing geometric optical evaluation function. The law of the optimal position of the feed source varies with the antenna aperture size and the beam steering angle. When parallel rays are obliquely projected on a parabolic cylinder, there is defocusing and defocusing lines exist. In this paper, the parameter equation of the defocused line is given, and the limit position of the optimal feed position when the size of the antenna aperture is gradually reduced is found. Radiation lobe patterns of several typical cases were calculated using the scalar diffraction theory. The calculation results show that the geometrical optics evaluation function is available for engineering practical problems.