Shielding Effectiveness of Ferrofluid Layer in the Presence of Oscillating Magnetic Field

IF 1.9 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Huan-Kuang Kuan;Hsin-Chieh Hsieh;Yan-Hom Li
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Abstract

This study investigates the effect of an oil-based ferrofluid layer subjected to oscillating magnetic fields on the shielding effectiveness (SE) of the electromagnetic wave (EMW) within 12.4–18 GHz. By leveraging the dynamic crest formations induced by varying the frequency from 0 to 105 Hz, the ferrofluid demonstrated significant adaptability and potential for effective electromagnetic interference (EMI) shielding. Results indicated that the ferrofluid crests exhibited pulsating behavior at lower oscillating frequencies of 1 Hz, enhancing SE to nearly 40 dB at 15.2 GHz. As the oscillation increased to 5 Hz, the crests displayed oscillatory instability, maintaining an SE peak of 37.7 dB at 17.6 GHz. For higher frequencies beyond 15 Hz, crest formation demonstrates a gradual diminishing behavior, transitioning into static or flat states, leading to a reduced SE. Additionally, the results revealed that thicker layers attenuate EM waves more effectively, even as crest dynamics become less pronounced. These findings highlight the capability of ferrofluid layers to achieve high EMI shielding through dynamic surface patterning, with thicker layers contributing to robust, adaptive, and flexible shielding solutions suitable for high-frequency electromagnetic environments.
振荡磁场作用下铁磁流体层的屏蔽效能
研究了振荡磁场作用下油基铁磁流体层对12.4 ~ 18 GHz电磁波屏蔽效能的影响。通过利用从0到105 Hz频率变化引起的动态波峰形成,铁磁流体显示出显著的适应性和有效屏蔽电磁干扰(EMI)的潜力。结果表明,铁磁流体波峰在较低的振荡频率为1 Hz时表现出脉动行为,在15.2 GHz时将SE提高到近40 dB。当振荡增加到5 Hz时,波峰表现出振荡不稳定性,在17.6 GHz处保持37.7 dB的SE峰值。对于高于15 Hz的更高频率,波峰形成表现出逐渐减弱的行为,过渡到静态或平坦状态,导致SE降低。此外,结果显示,即使波峰动力学变得不那么明显,较厚的层也能更有效地衰减电磁波。这些发现强调了铁磁流体层通过动态表面图案实现高电磁干扰屏蔽的能力,更厚的层有助于实现适用于高频电磁环境的鲁棒、自适应和灵活的屏蔽解决方案。
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来源期刊
IEEE Transactions on Magnetics
IEEE Transactions on Magnetics 工程技术-工程:电子与电气
CiteScore
4.00
自引率
14.30%
发文量
565
审稿时长
4.1 months
期刊介绍: Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The IEEE Transactions on Magnetics publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.
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