Dynamic modification of the pattern of a reflector antenna system traditionally requires an array of feeds. This letter presents an alternative approach in which the scattering from a fraction of the reflector around the rim is passively modified using, for example, an electronically reconfigurable reflectarray. This facilitates flexible sidelobe modification, including sidelobe canceling, for systems employing a single feed. Applications for such a system include radio astronomy, where deleterious levels of interference from satellites enter through sidelobes. We show that an efficient reconfigurable surface occupying about 11% of the area of an axisymmetric circular paraboloidal reflector antenna fed from the prime focus is sufficient to null interference arriving from any direction outside the main lobe with little change in the main lobe characteristics. We further show that the required surface area is independent of frequency and that the same performance can be obtained using 1 b phase control of the constituent unit cells for a reconfigurable surface occupying an additional 6% of the reflector surface.

中文翻译：

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通过电子可重构边缘散射对反射器天线进行旁瓣修改

反射器天线系统方向图的动态修改传统上需要一个馈源阵列。这封信提出了一种替代方法，其中使用例如电子可重构反射阵列被动地修改来自边缘周围反射器的一小部分的散射。对于采用单馈源的系统，这有助于灵活的旁瓣修改，包括旁瓣消除。这种系统的应用包括射电天文学，其中来自卫星的有害干扰水平通过旁瓣进入。我们表明，一个有效的可重构表面占据了从主焦点馈送的轴对称圆形抛物面反射器天线面积的 11%，足以消除来自主瓣外任何方向的干扰，而主瓣特性几乎没有变化。我们进一步表明，所需的表面积与频率无关，并且对于占据额外 6% 的反射器表面的可重构表面，使用组成单元的 1b 相位控制可以获得相同的性能。