非对称元素阵列的有源元素模式对称

A. Bhattacharyya
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引用次数: 21

摘要

在相控阵天线中,特别是在元件间距较小的情况下,相互耦合对天线的辐射方向图起着重要的作用。本文简要讨论了AEP的Floquet分析方法,并给出了远场矢量分量的Floquet模态振幅表达式。然后,我们将Floquet模态功率与输入功率联系起来,证明了无论元件形状如何,有源元件的功率图在“无光栅瓣”区域内必须是对称的;对称的或不对称的。光栅无瓣区定义为不存在可见光栅瓣的阵列的扫描区域。我们用一组不对称的多级喇叭来说明AEP的这一重要性质。我们用数值方法证明了孤立元模式是不对称的;然而,AEP在光栅无瓣区域内是完全对称的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Active element pattern symmetry for asymmetrical element arrays
In a phased array antenna, particularly with small element spacing, the mutual coupling plays an important role in the radiation pattern of the array. In this paper we briefly discuss about the Floquet analysis method for the AEP and provide expressions for the far field vector components in terms of the Floquet modal amplitudes. We then relate the Floquet modal power and the input power and prove that the active element power pattern must be symmetrical inside the "grating lobe free" region irrespective of the shape of the elements; symmetrical or asymmetrical. The grating lobe free region is defined as the scan region of an array corresponding to which no visible grating lobe exists. We illustrate this important property of AEP with respect to an array of asymmetrical multi-step horns. We show numerically that the isolated element pattern is asymmetrical; however, the AEP is perfectly symmetrical inside the grating lobe free region.
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