Some Studies Of Electromagnetic Interference Shielding Of Conductive Films

With the development of science and technology,the electromagnetic shielding material become increasingly demanding in recent years.People are eager to seek a Low-cost,electromagnetic shielding materials with good elasticity and electrical conductivity,which can be easily processed into conductive films.In this paper,we conducted preliminary exploration on electromagnetic shielding performance of ITO and MXene films on theoretical principle and experimental measurement.The contents of this thesis are as follows:Firstly,we introduce the research background of electromagnetic shielding principle and materials and the research status at home and abroad.Secondly,we present the experimental measurement methods of electromagnetic shielding in microwave frequency for different structural materials.At the same time,I also learned the two-dimensional electromagnetic field detection technology and the construction and assembly of the platform and software in postgraduate,which laying a solid foundation for future experimental research.Thirdly,start from Maxwell's equation,we theoretically study the electromagnetic shielding performance of conductive films.On this basis,we pointed out that the deficiency of the formula of electromagnetic shielding performance,Simon formalism,which is commonly used in the past,is the lack of consideration of multiple internal reflections inside the material.In addition,we improve the theoretical formula for different thickness of conductive films and experimental measurement to make it more universal and applicable.At last,we use our theory to calculate the electromagnetic shielding properties of two conductive films,ITO and MXene films,and find that the results are in good agreement with the measured data.From this,we can use this method to calculate electromagnetic properties of conductive films.