An Approximate Model for Near-Field Calculation of Phased Array

V. Chtcherbakov
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引用次数: 1

Abstract

This paper presents the application of an effective aperture (EA) model for the near-field (NF) calculation on the main beam axis of a scanned phased array (PA) with arbitrary aperture shape and uniform amplitude distribution. An EA model presents a realistic approximation of PA functioning principles that had earlier been applied for only far-field calculations. The proposed method is based on the scalar wave theory and a representation of a two-dimensional Rayleigh-Sommerfeld diffraction integral for the field intensity of flat aperture in the form of a one-dimensional parametric integral around the perimeter of the aperture, as obtained by Dubra and Ferrari. The method attempts to simplify the near-field calculations of PA using the general parameters of an antenna. An accuracy analysis of NF simulation results for elliptical and rectangular PA has been completed. The limitations for the minimal NF distance and the maximal scan angle as a function of array dimensions have been obtained. A comparison of the EA results of the NF calculation with NF simulations using electromagnetic software FEKO demonstrates a positive correlation. The method shows that the NF of PA with a scanned beam, as a rule, has greater field intensity in comparison with the broadside direction of radiation at the same distance from the aperture. Therefore, PA presents an increased risk of human exposure and electromagnetic interference in the NF region.
相控阵近场计算的近似模型
本文提出了有效孔径(EA)模型在具有任意孔径形状和均匀振幅分布的扫描相控阵(PA)主波束轴近场计算中的应用。EA模型提供了一个现实的PA功能原理的近似值,这些原理以前只应用于远场计算。所提出的方法是基于标量波理论和二维Rayleigh-Sommerfeld衍射积分的平面孔径场强的表示,其形式为围绕孔径周长的一维参数积分,由Dubra和Ferrari得到。该方法试图利用天线的一般参数简化PA的近场计算。对椭圆和矩形PA的NF模拟结果进行了精度分析。得到了最小纳波距离和最大扫描角随阵列尺寸的变化规律。利用电磁软件FEKO对NF计算的EA结果与NF模拟结果进行了比较,结果表明两者呈正相关。计算结果表明,在距离孔径相同的距离上,扫描波束的光阑比宽方向的辐射具有更大的场强。因此,PA增加了人体接触和NF区域电磁干扰的风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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