主动隐身
Active Cloaking
摘要：
电磁隐身是指防止物体散射入射电磁场的能力。在最近的工作中，这已经通过在物体周围路由入射场或通过特殊设计的材料、表面或引导结构改变物体本身的散射特性来实现。在这封信中，我们介绍了一种新的方法来消除电磁散射的目标，通过使用一个阵列的源。我们表明，通过叠加磁和电的表面电流密度在一个对象的边界，从该对象的散射场可以被取消。这些磁和电的表面电流可以被离散成电和磁偶极子，其可以通过直线和环形线天线物理地实现。最后，我们证实了我们的结果，通过这样的线天线的薄阵列的电介质和金属圆柱体的隐身使用数值模拟。
英文摘要：
Electromagnetic cloaking refers to the ability to prevent an object from scattering an incident electromagnetic field. This has been accomplished in recent works by routing the incident field around the object or by changing the scattering properties of the object itself through specially designed materials, surfaces or guiding structures. In this letter, we introduce a new way of cancelling the electromagnetic scattering of an object by using an array of sources. We show that by superimposing magnetic and electric surface current densities at the boundary of an object, the scattered fields from that object can be cancelled. These magnetic and electric surface currents can be discretized into electric and magnetic dipoles which are physically implementable by straight and loop wire antennas. Finally we confirm our results using numerical simulations for cloaking a dielectric and a metallic cylinder by means of a thin array of such wire antennas.
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