非赋形双偏置高性能椭圆波束天线

Unshaped dual offset ellipsoidal beam antenna with high performance

分析了非赋形双偏置天线产生椭圆波束的机理 ,将馈源的椭圆波束照射到轮廓线为椭圆形的付反射面上 ,通过双偏置天线的对称转换原理 ,主反射面产生椭圆波束。馈源波束由矩形口径的多模喇叭产生 ,它提供了等化的方向图。给出了馈源及天线的方向图计算公式。实验结果表明 ,实测方向图基本与理论计算一致。与其他类型的椭圆波束天线相比 ,本天线加工简单 ,同时天线效率也较高。

Based on the principle of symmetrical transition of dual offset antenna, let the beam of the feed irradiate the ellipsoidal subreflector, an ellipsoidal beam can be produced by the main reflector of an unshaped dual offset antenna. The feed is designed as a rectangle multimode horn with equal radiation patterns. The analytical expressions for calculating the patterns of the feed and antenna are presented. A better agreement between the experimental results and calculated patterns is obtained. Compared with other ellipsoidal beam antennas, the antenna has the characteristics of higher efficiency and simplicity of fabrication.