Subwavelength planar leaky-wave components with metamaterial bilayers
Subwavelength planar leaky-wave components with metamaterial bilayers
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DOI：
10.1109/tap.2007.891844
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发表时间：
2007-03-01
影响因子：
5.7
通讯作者：
Vegni, Lucio
中科院分区：
文献类型：
--
作者：
Alu, Andrea;Bilotti, Filiberto;Vegni, Lucio
详细分析了超材料平面双层在微波环境下合成紧凑亚波长漏波辐射体中的潜在应用。特别地，对“互补”超材料进行配对以减小微波元件尺寸的可能性进行了探索，用于由一对接地平面层组成的开放波导的漏波操作。结合我们在使用这种互补配对的其他设置中的类似发现，我们在这里展示了如何在“负”和“正”材料之间的界面上紧密共振也可以在这种情况下得到适当的利用。此外，选用低本构参数的材料可以有效地提高这些构件的指向性。我们详细探讨了这些双层结构支持的异常自然模的显著引导和辐射特性，给出了一些异常现象的物理见解，并考虑了在一些现实设置中可能存在的局限性。
The potential use of metamaterial planar bilayers for synthesizing compact subwavelength leaky-wave radiators in the microwave regime is analyzed in detail. In particular, the possibility of pairing "complementary" metamaterials in order to reduce the dimensions of microwave components is explored for the leaky-wave operation of an open waveguide consisting of a grounded pair of planar layers. In connection with our similar findings in other setups employing such complementary pairings, here we show how the compact resonance at the interface between "negative" and "positive" materials may also be properly exploited in this context. Choosing materials with low constitutive parameters, moreover, shows to be effective for enhancing the directivity of these components. We explore in detail the notable guidance and radiation properties of the anomalous natural modes supported by these bilayered structures, giving some physical insights into the anomalous phenomenon and considering the possible limitations in some realistic setups.