Radiation of planar electromagnetic waves by a line source in anisotropic metamaterials
Radiation of planar electromagnetic waves by a line source in anisotropic metamaterials
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DOI：
10.1088/0022-3727/43/33/335406
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发表时间：
2010-08
期刊：
影响因子：
--
通讯作者：
Q. Cheng;W. Jiang;T. Cui
中科院分区：
文献类型：
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作者：
Q. Cheng;W. Jiang;T. Cui
我们的实验表明，在各向异性超材料的线源直接辐射平面电磁波，而不是柱面波，当磁导率张量的一个组件接近零。这种材料的阻抗可以与自由空间的阻抗完美匹配，这可以显著减少源和覆盖层之间的反射，就像传统的基于零折射率超材料的高方向性天线一样。这种独特的性质决定了线源激发的电磁波是双向传播，而不是全向传播。利用这一特性，利用具有任意形状的各向异性超材料实现了电磁波的高度定向发射。我们设计并制作了微波区的各向异性超材料，并观察到平面波的产生及其高方向性发射。所提出的平面波发射与各向异性超材料的形状变化无关，可用于共形天线的设计。
We show experimentally that a line source in an anisotropic metamaterial directly radiates planar electromagnetic waves instead of cylindrical waves, when one component of the permeability tensor approaches zero. The impedance of this material can be perfectly matched to that of free space, which can significantly reduce the reflections between the source and the superstrate, as in traditional highly directive antennas based on zero index metamaterials. Such a unique property determines the two-way propagation of electromagnetic waves excited by a line source, instead of all-way propagation. From this feature, a highly directive emission of electromagnetic waves is achieved using the anisotropic metamaterial with arbitrary shape. We have designed and fabricated the anisotropic metamaterial in the microwave region, and observed the generation of plane waves and their highly directive emission. The proposed plane-wave emission is independent of the shape variance of the anisotropic metamaterial, which can be utilized in the design of conformal antennas.