ABSTRACT A sidelobe-suppression technique for the reflector antenna is proposed. Compared to the conventional reflector antenna analysis technique, the proposed technique adopts the novel quasi-actual feed instead of the traditional imaginary feed to calculate and optimize the radiation pattern of the reflector antenna. The calculated and the optimized radiation results obtained by the proposed technique are more accurate since the quasi-actual feed data is closer to that of the practical feed. In the proposed technique, the sidelobes are suppressed by optimizing the shape of the reflector illuminated by the quasi-actual feed. The reflector shape is smoothly transformed by the non-uniform rational B-spline technique and the scatter of the reflector is efficiently calculated by the physical optics and the Gauss-Legendre quadrature algorithms. The pattern result of this proposed technique is compared with the result simulated by FEKO software, a good agreement is achieved and has a higher efficiency. As an example of applying the proposed technique, an unshaped and a shaped reflector antennas with the same feed and the same size are designed, fabricated and tested, and the measured results agree well with the expectations on the low sidelobe characteristic.

中文翻译：

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一种基于准实际馈电的反射面天线旁瓣电平抑制技术

摘要 本文提出了一种反射面天线的旁瓣抑制技术。与传统的反射面天线分析技术相比，所提出的技术采用新颖的准实际馈源代替传统的虚数馈源来计算和优化反射面天线的辐射方向图。由于准实际馈源数据更接近实际馈源数据，因此所提出技术获得的计算和优化辐射结果更加准确。在所提出的技术中，通过优化由准实际馈源照射的反射器的形状来抑制旁瓣。反射器形状通过非均匀有理 B 样条技术平滑变换，反射器的散射通过物理光学和 Gauss-Legendre 正交算法有效计算。该技术的模式结果与FEKO软件模拟的结果进行了比较，达到了较好的一致性，具有较高的效率。作为应用所提出技术的一个例子，设计、制造和测试了具有相同馈源和相同尺寸的未成形和成形反射面天线，测量结果与低旁瓣特性的预期非常吻合。