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Performance of a small reflector with a splashplate feed

机译：带有防溅板的小型反光罩的性能

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Reflector antennas with aperture diameters of less than ten wavelengths are difficult to design with good sidelobe performance because of blockage problems. A small prime focus reflector for 8.4 GHz has been designed using mode-matching techniques. The design was aimed at providing sidelobes of less than -20 dB without degrading the gain excessively. In order to minimise blockage problems, a splashplate feed was chosen. The diameter of the integrated subreflector must be small and has to be optimised in order to offset blockage losses against diffraction and spillover losses. The feed dimensions must also be optimised to reduce blockage losses. The measured results agree well with predictions. The target of less than -20 dB sidelobes was achieved with an aperture efficiency of 60% and the authors conclude that mode-matching is a useful approach to the design of such small antennas.
机译：由于阻塞问题，孔径直径小于十个波长的反射天线很难设计成具有良好的旁瓣性能。使用模式匹配技术设计了用于8.4 GHz的小型主聚焦反射器。该设计旨在提供小于-20 dB的旁瓣，而不会过度降低增益。为了最小化堵塞问题，选择了防溅板进料。集成子反射器的直径必须很小，并且必须进行优化，以抵消阻挡损耗对衍射和溢出损耗的影响。进料尺寸也必须进行优化，以减少堵塞损失。测得的结果与预测吻合得很好。低于-20 dB旁瓣的目标以60％的孔径效率实现，作者得出结论，模式匹配是设计此类小型天线的有用方法。

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