Actuated Dielectric-Lossy Screen for Dynamically Suppressing Electromagnetic Interference,ACS Applied Electronic Materials

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Actuated Dielectric-Lossy Screen for Dynamically Suppressing Electromagnetic Interference
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2020-11-08 , DOI: 10.1021/acsaelm.0c00782
Andrew D. M. Charles _{1,

2} , Andrew N. Rider ₁ , Sonya A. Brown ₂ , Chun H. Wang ₂

Affiliation

Existing methods for electromagnetic interference suppression typically employ attaching absorbers to the external surface of a structure at a fixed distance. In this work, we present a dynamically tunable, electromagnetic interference suppression technique using a multifunctional nanocomposite that offers a wider bandwidth and exceptional absorption when compared to existing approaches. The nanocomposite, incorporating carbon nanotubes and carbonyl iron powder, provides multiple functions as a lossy dielectric screen for attenuating electromagnetic waves, supporting stress, and conducting heat to dynamically control the position and hence the resonant characteristics of the absorbing screen. The dielectric properties of the nanocomposite were optimized for a target operational frequency, enabling a large reduction in the total thickness when compared with conventional resistive screen absorbers. Tuning the resonance around the design frequency yielded a peak absorption of −40.9 dB and an effective −10 dB bandwidth of 7.4 GHz in the 2–18 GHz frequency range. The mechanical and electromagnetic properties of the nanocomposite were characterized and found to correlate well with numerical and analytical modeling. The multifunctional nanocomposite and complimentary tunable structure design provide opportunities for highly improved EMI suppression structures.

中文翻译：

用于动态抑制电磁干扰的致动介电损耗屏

用于抑制电磁干扰的现有方法通常采用以固定距离将吸收器附接到结构的外表面。在这项工作中，我们提出了一种使用多功能纳米复合材料的动态可调电磁干扰抑制技术，与现有方法相比，该技术可提供更宽的带宽和出色的吸收能力。掺有碳纳米管和羰基铁粉的纳米复合材料具有多种功能，可作为有损耗的介电屏，用于衰减电磁波，支撑应力并传导热量以动态控制吸收屏的位置，进而控制其共振特性。纳米复合材料的介电性能针对目标工作频率进行了优化，与传统的电阻屏式吸收器相比，可以大大减小总厚度。在设计频率附近调整谐振会产生−40.9 dB的峰值吸收和在2–18 GHz频率范围内的7.4 GHz的有效−10 dB带宽。表征了纳米复合材料的机械和电磁性能，并发现其与数值和分析模型很好地相关。多功能纳米复合材料和互补的可调结构设计为高度改进的EMI抑制结构提供了机会。表征了纳米复合材料的机械和电磁性能，并发现其与数值和分析模型很好地相关。多功能纳米复合材料和互补的可调结构设计为高度改进的EMI抑制结构提供了机会。表征了纳米复合材料的机械和电磁性能，并发现其与数值和分析模型很好地相关。多功能纳米复合材料和互补的可调结构设计为高度改进的EMI抑制结构提供了机会。

更新日期：2020-12-22

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