A technique for the synthesis of shaped-beam radiation patterns with approximately equal-percentage ripple
A technique for the synthesis of shaped-beam radiation patterns with approximately equal-percentage ripple
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DOI：
10.1109/tap.1967.1139040
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发表时间：
1966
期刊：
影响因子：
--
通讯作者：
R. Hyneman;R. Johnson
中科院分区：
文献类型：
--
作者：
R. Hyneman;R. Johnson
讨论了一种新的方向图合成技术，该技术可以得到近似相等百分比或dB涟漪的成形波束方向图。该方法是基于控制的位置的图案功能的零在复杂的图案平面与这些零的相对位移从真实的\sin \theta轴确定的幅度的涟漪获得的合成图案。在应用该技术时，通过从具有已知零位置的扇形或扇形图案开始来近似地约束位置。然后通过零点的确定性扰动将扇形图案扭曲或扰动为期望形状的图案。结果发现，扇形图案的设计涟漪在此过程中大致保持。在涟漪幅度和近似模式函数的最大归一化斜率之间存在折衷。实现了波束赋形区内涟漪电平和波束赋形区外旁瓣电平的独立控制。提出并讨论了成形波束方向图（包括\csc^{2} \theta方向图）的几个例子。
A new pattern synthesis technique which leads to shaped-beam patterns of approximately equal percentage or dB ripple is discussed. The method is based on the controlled location of the zeros of the pattern function in the complex pattern plane with the relative displacement of these zeros from the real \sin \theta axis determining the magnitude of ripple obtained with the synthesized pattern. In applying the technique, the locations are approximately constrained by starting with a fan or sector pattern having known zero locations. The sector pattern is then warped or perturbed to the pattern of desired shape by deterministic perturbations of the zeros. It is found that the design ripple of the sector pattern is approximately maintained during this process. A trade-off exists between ripple magnitude and maximum normalized slope of the approximating pattern function. Independent control of ripple level within the shaped-beam region and of sidelobe level without is achieved. Several examples of shaped-beam patterns (including \csc^{2} \theta patterns) are presented and discussed.