低反射、高吸收海水电磁屏蔽体

目的通过在有耗海水电磁屏蔽体上加载阻抗匹配层,研究具有低反射、高吸收特性海水电磁屏蔽体结构。方法基于有耗海水电磁屏蔽体的输入阻抗,并利用传输线原理,计算对应匹配媒质层的结构与电磁参数。针对初始具有较好电磁屏蔽效能的反射型海水电磁屏蔽体样本,计算和加载工作在ISM 433 MHz频段的匹配媒质层。结果加载了匹配媒质层的海水电磁屏蔽体能展示出良好的低反射、高吸收电磁屏蔽特性。当入射电磁波全部穿透进入海水层,产生传导和极化衰减后,对屏蔽效能影响较小。结论由海水层和匹配媒质层组成的多元材料电磁屏蔽体,可以实现低反射、高吸收电磁屏蔽效果,并保持良好电磁屏效能的优势。低反射电磁屏蔽体有望在精度仪器、目标反探测等领域发挥重要作用。

Low-reflection and High-absorption Seawater Electromagnetic Shielding

The work aims to investigate low-reflection and high-absorption electromagnetic (EM) shielding of seawater by applying air impedance matching layers on initial seawater EM shielding. Based on the impedance of the initial seawater EM shielding and transmission line theory, the structure and EM parameters were calculated for the matching layers. For the reflective seawater EM shielding with high shielding effectiveness, the corresponding matching layers working at 433 MHz in ISM band were calculated and applied. The seawater electromagnetic shielding with matching layers could exhibit good EM shielding effectiveness with low-reflection and high-absorption. When all the incident electromagnetic waves penetrated into the seawater layer, resulting in conduction and polarization attenuation, the shielding effectiveness was less affected. Multi-material electromagnetic shielding consisting of seawater and matching materials can realize low-reflection and high-absorption EM shielding and keep the advantage of reflective seawater EM shielding. Matching seawater EM shielding is expected to play an important role in precision instrument electromagnetic shielding, target reverse detection and other fields.