垂直界面使轻质微丝/硅橡胶复合材料的散射光谱具有较大的可调谐性
Vertical interface enabled large tunability of scattering spectra in lightweight microwire/silicone rubber composites
摘要：
在此之前，我们已经展示了一种基于功能相和拓扑结构的微结构调制的方法的优点，周期性排列的元素来编程铁磁微丝复合材料中的波散射。然而，充分利用复合材料本征结构的可能性并没有被开发。在这项工作中，我们实现了材料planification的概念，通过一个内置的垂直界面随机分散的短切微丝复合材料，允许在很大程度上调整电磁性能。通过在两个分离的区域中布置不同结构的线，并且通过线浓度变化来扩大或减小这些区域，从而导致跨界面的极化差异以及因此的微波可调谐性，来修改这样的界面。当两个区域中的线浓度相等时，产生了具有不同幅度和带宽的两个定义明确的透射窗口。导线浓度波动导致强散射的变化范围从宽的通带到阻带与显着的传输骤降，表现出密切的关系，在界面处的导线含量和空间电荷的变化。总的来说，这项研究提供了一种新的方法，合理利用界面效应的微丝复合材料。此外，仅0.053体积%的填料加载和相对简单的结构，使显着可调的散射光谱的优点，使建议的复合planification策略有助于设计微波滤波器的宽带频率选择性。
英文摘要：
Previously, we have shown the advantages of an approach based on microstructural modulation of the functional phase and topology of periodically arranged elements to program wave scattering in ferromagnetic microwire composites. However, the possibility of making full use of composite intrinsic structure was not exploited. In this work, we implement the concept of material plainification by an in-built vertical interface on randomly dispersed short-cut microwire composites allowing the adjustment of electromagnetic properties to a large extent. Such interface was modified through arranging wires of different structures in two separated regions and by enlarging or reducing these regions through wire concentration variations leading to polarization differences across the interface and hence microwave tunability. When the wire concentration was equal in both regions, two well-defined transmission windows with varied amplitude and bandwidth were generated. Wire concentration fluctuations resulted in strong scattering changes ranging from broad passbands to stopbands with pronounced transmission dips, demonstrating the intimate relationship between wire content and space charge variations at the interface. Overall, this study provides a novel method to rationally exploit interfacial effects in microwire composites. Moreover, the advantages of enabling significantly tunable scattering spectra by merely 0.053 vol. % filler loading and relatively simple structure make the proposed composite plainification strategy instrumental to designing microwave filters with broadband frequency selectivity.
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