文档介绍：3D 角反射天线作馈源的偏馈抛物面天线
3 D Corner Reflector Antenna as an efficient feed for
offset parabolic antennas for GHz
3D角反射天线作馈源的偏馈抛物面天线
Dragoslav Dobričić, YU1AW

Abstract
摘要

In this article I present a modification of 3D corner reflector antenna in order to adjust
it for the use as a feed for SAT TV offset parabolic antennas on 6 cm Ham band or
WLAN frequencies of GHz.
本文介绍用改进型3D角反射天线,为6厘米业余无线电通信频段STA卫星电视
。

Introduction
引言

The problems that occur while illuminating shallow offset parabolas, in addition to
those related to the efficient use of parabolic generally, are additionally aggravated by
the specific geometry of the parabolic mirror itself. Feed positioning in the way that
its phase center exactly coincides with the focus of the offset parabola and its
direction so that the radiation maximum falls in the geometric center of the elliptic
reflector surface are not intuitive at all, as in classic parabolic antennas. Therefore,
there are a many confusions and wrongly positioned feeds that don't correctly
illuminate offset a parabolic dish, decreasing its efficacy and gain.
这个问题时常存在于浅照射的偏馈抛物面天线上,除了和抛物面天线的效率
有关之外,抛物线反射面本身的具体几何形状又使之更加严重。馈源用这样的
方式定位——其相位中心准确位于偏馈抛物线反射器的焦点,方向也要准确,
这样辐射最大值才能落在椭圆形反射面的几何中心,这样一点也不直观,正如
标准的抛物面天线。因此,有许多混乱和错误放置馈源的方式,不能正确照射
抛物柱面反射器,降低了其效率和增益。

Classic and offset parabola
标准的和偏置的抛物面

A parabolic surface or paraboloid is formed by rotation of parabolic curve around its
axis of symmetry. The specificity of the surface gained in this way is that when the
beam of rays parallel to its axis of rotation falls on it, the beam is reflected so that all
the rays meet in one point, known as the focus, in the same way that optical lenses
focus light rays in their focus.
抛物线的表面或曰抛物面,是由抛物线围绕其对称轴旋转而成,其特点是,
和抛物线对称轴平行的射线波束被抛物面所反射,所有的电波都在同一点汇聚,
1
September,2009
3D 角反射天线作馈源的偏馈抛物面天线
我们把这点叫做焦点。
When the piece of a (m