经由变换光学器件的超定向天线
Ultra directive antenna via transformation optics
摘要：
空间坐标变换是电磁场控制的可靠工具。在本文中，我们推导出的磁导率和介电常数张量的超材料能够转换成一个紧凑的超定向天线在微波域的各向同性辐射源。我们表明，这种天线的方向性是有竞争力的关于传统的定向天线喇叭和反射面天线，除了它的尺寸更小。数值模拟使用有限元方法来说明这些属性。减少电磁材料参数也提出了一个简单的制造这种天线从现有的材料。接下来，提出了使用分层超材料的天线的设计。不同的层都是由均匀和单轴各向异性的超材料，它可以从简单的金属-电介质结构。当辐射源嵌入分层超材料中时，从天线辐射高度定向的波束
英文摘要：
Spatial coordinate transformation is used as a reliable tool to control electromagnetic fields. In this paper, we derive the permeability and permittivity tensors of a metamaterial able to transform an isotropically radiating source into a compact ultradirective antenna in the microwave domain. We show that the directivity of this antenna is competitive with regard to conventional directive antennas horn and reflector antennas, besides its dimensions are smaller. Numerical simulations using finite element method are performed to illustrate these properties. A reduction in the electromagnetic material parameters is also proposed for an easy fabrication of this antenna from existing materials. Following that, the design of the proposed antenna using a layered metamaterial is presented. The different layers are all composed of homogeneous and uniaxial anisotropic metamaterials, which can be obtained from simple metal-dielectric structures. When the radiating source is embedded in the layered metamaterial, a highly directive beam is radiated from the antenna
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