掺杂纳米稀土氧化物的电磁屏蔽材料的电磁匹配规律研究及设计

The Study and Design on the Electromagnetic Matching of Electromagnetic Shielding Materials Doped with Nano-Rare Earth Oxides

利用电磁波传输理论推导出了电磁屏蔽材料表面反射率公式、基于电磁参数广义匹配规律下总后向反射率公式和预设总后向反射率取值的表面反射率公式;通过3维网格法理论分析了电磁参数对表面反射率和总后向反射率的影响,并使用掺杂了纳米稀土氧化物的电磁屏蔽材料进行优化设计.研究结果表明:在电磁屏蔽材料的设计中应主要调节材料的电损耗ε;掺杂了少量纳米稀土氧化物的电磁屏蔽涂层能实现在2~18 GHz内有大于6 dB的衰减值,即表明掺杂纳米稀土氧化物能够较好地提高材料的电磁屏蔽性能.

Using electromagnetic wave transmission theory,the surface reflectance formula of electromagnetic shielding materials,the total backward reflectance formula based on the generalized matching law of electromagnetic parameters and the surface reflectance formula of preset total reflectance are derived,respectively.Then,the effect of electromagnetic parameters on the surface reflectivity and total back-reflectivity is analyzed by the three-dimensional grid method,and the electromagnetic shielding materials doped with nano-rare earth oxides are used to optimize design.The results show that the electric loss of electromagnetic shielding materials shall be mainly regulated in the design of electromagnetic shielding materials.And the electromagnetic shielding coating doped with a small number of nano-rare earth oxides can achieve an attenuation value greater than 6 dB at 2~18 GHz,which indicates that the doping of nano-rare earth oxides can improve the electromagnetic shielding performance of the materials.