Significant enhancement of magnetic shielding effect by using the composite metamaterial composed of mu-near-zero media and ferrite

• Main Authors: Chen Xu, Wang Yuqian, Guo Zhiwei, Wu Xian, Yang Fengqing, Sun Yong, Li Yunhui, Jiang Haitao, Chen Hong
• Format: Article
• Language: English
• Published: EDP Sciences 2021-01-01
• Series: EPJ Applied Metamaterials
• Subjects: metamaterials; magnetic shielding; patterned ferrite
• Online Access: https://epjam.edp-open.org/articles/epjam/full_html/2021/01/epjam210003/epjam210003.html

The magnetic shield plays an important role in magnetic near-field control. However, the requirements of efficiency, ultra thinness, lightness and cheapness are still the challenges. Here, we firstly propose a composite metamaterial in which the mu-near-zero media is covered with a ferrite slab. We verify that this structure can enhance the shielding effectiveness (SE) in a small area. Furthermore, we optimize the magnetic path by changing the bulk ferrite slab into a patterned slab. In this way, significant SE enhancement can be achieved in a large area. Experimental results show that the maximum SE of the composite metamaterial with a patterned ferrite is 20.56 dB, which is nearly 19 dB higher than that of a single ferrite slab with the same thickness of the composite metamaterial. The results on the composite metamaterial would be very useful in the applications involving magnetic shielding.