Weight Selection for Pattern Control of Paraboloidal Reflector Antennas with Reconfigurable Rim Scattering
Weight Selection for Pattern Control of Paraboloidal Reflector Antennas with Reconfigurable Rim Scattering
复制标题
具有可重构边缘散射的抛物面反射面天线方向图控制的权重选择
DOI：
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Ieee S.W. Ellingson Senior Member
中科院分区：
文献类型：
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作者：
R. Buehrer;Ieee Fellow;Ieee S.W. Ellingson Senior Member
最近已经证明，通过使用沿着边缘的可重构元件来修改抛物面反射器天线的边缘散射有利于旁瓣修改，包括消除旁瓣。在这项工作中，我们研究了确定单位幅度权重（即修改散射信号相位的权重）的技术，以实现与反射器轴任意角度的旁瓣抵消。具体来说，结果表明，尽管搜索空间很大且成本函数非凸，但仍可以以合理的复杂度找到权重，从而提供显着的消除能力。首先，找到没有任何大小限制的最佳权重。随后，开发了用于确定量化和非量化相位的单位模权重的算法。此外，还表明可以获得在提供恒定主瓣增益的同时消除旁瓣的权重。主要发现是，在实际（二元或四元）仅相位权重的主瓣基本上没有变化的情况下，足够深的零点是可能的。
It has been recently demonstrated that modifying the rim scattering of a paraboloidal reflector antenna through the use of reconfigurable elements along the rim facilitates sidelobe modification including cancelling sidelobes. In this work we investigate techniques for determining the unit-magnitude weights (i.e., weights which modify the phase of the scattered signals) to accomplish sidelobe cancellation at arbitrary angles from the reflector axis. Specifically, it is shown that despite the large search space and the non-convexity of the cost function, weights can be found with reasonable complexity which provide significant cancellation capability. First, the optimal weights without any magnitude constraints are found. Afterwards, algorithms are developed for determining the unit-modulus weights with both quantized and unquantized phases. Further, it is shown that weights can be obtained that both cancel sidelobes while providing a constant main lobe gain. A primary finding is that sufficiently deep nulls are possible with essentially no change in the main lobe with practical (binary or quaternary) phase-only weights.