Broadband and Tunable Microwave Absorption Properties from Large Magnetic Loss in Ni–Zn Ferrite
Broadband and Tunable Microwave Absorption Properties from Large Magnetic Loss in Ni–Zn Ferrite
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DOI：
10.1002/admt.202301857
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发表时间：
2024-01
影响因子：
6.8
通讯作者：
Subrata Ghosh;Shweta Sharma;Wenjie Li;Amin Nozariasbmarz;Lavanya Raman;Na Liu;G. Goyal;Yu Zhang-Y
中科院分区：
文献类型：
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作者：
Subrata Ghosh;Shweta Sharma;Wenjie Li;Amin Nozariasbmarz;Lavanya Raman;Na Liu;G. Goyal;Yu Zhang-Y
在千兆赫（GHz）频率下具有强反射损耗（RL）和宽吸收带宽（EBW）的高效电磁（EM）波吸收材料对于先进的无线应用和便携式电子产品至关重要。传统的微波吸收器缺乏磁损耗并且难以实现阻抗匹配，而铁氧体是稳定的，表现出优异的磁损耗和介电损耗，并且提供更好的阻抗匹配。然而，在铁氧体中实现所需的电子束焊接仍然是一个挑战，需要进一步的成分设计。在这项研究中，阻抗匹配成功地提高和EBW在Ni-Zn铁氧体的扩展连续掺杂Mn和Co，没有纳入任何聚合物填料。结果发现，Ni0.4Co0.1Zn0.5Fe1.9Mn0.1O4材料具有优异的电磁波吸收性能，最大RL为−48.7 dB。它还具有10.8 GHz的有效EBW，在4.5 mm的厚度下保持90%的吸收率（RL < −10 dB）。这些出色的性能来自于大量的磁损耗和良好的阻抗匹配。这些发现代表了微波吸收材料开发的重要一步，解决了GHz频率范围内的电磁波污染问题，包括流行的5G技术中使用的频段。
Highly effective electromagnetic (EM) wave absorber materials with strong reflection loss (RL) and a wide absorption bandwidth (EBW) in gigahertz (GHz) frequencies are crucial for advanced wireless applications and portable electronics. Traditional microwave absorbers lack magnetic loss and struggle with impedance matching, while ferrites are stable, exhibit excellent magnetic and dielectric losses, and offer better impedance matching. However, achieving the desired EBW in ferrites remains a challenge, necessitating further composition design. In this study, impedance matching is successfully enhanced and EBW in Ni–Zn ferrite is broadened by successive doping with Mn and Co , without incorporation of any polymer filler. It is found that Ni0.4Co0.1Zn0.5Fe1.9Mn0.1O4 material exhibits exceptional EM wave absorption, with a maximum RL of −48.7 dB. It also featured a significant EBW of 10.8 GHz, maintaining a 90% absorption rate (RL < −10 dB) for a thickness of 4.5 mm. These outstanding properties result from substantial magnetic losses and favorable impedance matching. These findings represent a significant step forward in the development of microwave absorber materials, addressing EM wave pollution concerns within GHz frequencies, including the frequency band used in popular 5G technology.