一种宽频带,近场馈电的机械扫描平面（圆盘）反射器天线

本文分析了一种宽频带，近场喇叭馈电的平面圆盘反射器机械扫描天线。天线的组成见图1。平面圆盘被处在近场区域中的喇叭照射．并绕着喇叭轴旋转使圆盘散射场形成的波瓣在水平面内扫描。采用矢量Kirchhoff公式计算由喇叭照射在圆盘表面引起的磁场，并应用物理光学方法计算圆盘产生的散射场，即圆盘的散射波瓣，其中还包括喇叭的直接辐射场。计算结果基本上与实测结果吻合。因此本文的方法可用于宽频带，机械扫描平面反射器天线的设计。

A Broadband Mechanically Scanned Disk Reflector Antenna with a Fed Horn in the Near-Field Region

In this paper. the scattering field of a planar disk reflector illuminated by a fed hornin the near-fleld reglon is aralysed and calculated. Its geometry is shown in Fig. 1. The calculationof near-field of fed horn is performed using tvector -Kirchhoff formula. The scattering field of diskreflector including directly radlatied field by the fed horn is calculated using physical opticalrnethod. The results is basically in agreement with the measured pattern. This calculating methodcan be used in the design of a broadband, mechanically scanned plannar reflector antenna.