This paper deals with both forward and inverse electromagnetic scattering of metallic objects by focused Bessel-shaped incident field. After discussing the main features of this kind of field, it is shown that its focusing capabilities may offer new effective possibilities for the detection of metallic targets which are not so far extended with respect to the probing wavelength, i.e., not satisfying the hypotheses of physical optics approximation. Numerical examples are performed by means of full-wave simulations, and then inversion algorithms based on back-propagation and physical optics are exploited to show that more accurate reconstructions can be pursued using Bessel-shaped fields.

中文翻译：

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金属物体通过聚焦贝塞尔形场的前向和反向散射


本文通过聚焦贝塞尔形入射场处理金属物体的前向和反向电磁散射。在讨论了此类领域的主要特征后，结果表明，其聚焦能力可以为金属目标的检测提供新的有效可能性，这些金属目标相对于探测波长尚未扩展，即不满足物理假设。光学近似。通过全波模拟进行数值示例，然后利用基于反向传播和物理光学的反演算法来表明使用贝塞尔形场可以实现更准确的重建。