Sidelobe Modification for Reflector Antennas by Electronically Reconfigurable Rim Scattering
Sidelobe Modification for Reflector Antennas by Electronically Reconfigurable Rim Scattering
复制标题
通过电子可重构边缘散射对反射面天线进行旁瓣修改
DOI：
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发表时间：
2021
影响因子：
4.2
通讯作者：
Ramonika Sengupta
中科院分区：
文献类型：
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作者：
S. Ellingson;Ramonika Sengupta
反射器天线系统的方向图的动态修改传统上需要馈源阵列。这封信提出了一种替代方法，其中从一小部分的反射器周围的边缘的散射是被动修改，例如，电子可重构的reflectarray。这有利于灵活的旁瓣修改，包括旁瓣消除，用于采用单馈的系统。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，一个有效的可重构的表面占据约11%的面积的轴对称圆抛物面反射器天线从主焦点馈送是足够的零干扰到达主瓣外的任何方向，在主瓣特性的变化不大。我们进一步表明，所需的表面积是独立的频率和相同的性能，可以获得使用1 B相位控制的构成单位细胞的可重构表面占据额外的6%的反射器表面。
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.