Research On The Shielding Effectiveness Of Electromagnetic Radiation Shielding Clothing Localized Area Based On FDTD

With the development of technology and the increasing usage of electronic products,the electromagnetic radiation is becoming increasing serious,Growing problem of the electromagnetic radiation seriously threaten our living environment and people’s health.In order to effectively protect human health, the research on electromagnetic protection product become an hot spot in all DepartmentsAnd studies on electromagnetic shielding performance protection products also become a hot topic in the electromagnetic fields.In the research of shielding effectiveness of electromagnetic radiation fabrics and clothing, the research on shielding effectiveness of the complete closure of the shielding fabric is already matures,but the research on shielding effectiveness of the non-closed state fabric also almost empty stage.The study found that there are a lot of influence factor on the shielding effectiveness of anti-electromagnetic radiation clothing.Not only with anti-electromagnetic radiation clothing material type, radiation, distance from radiation to clothing,the thickness of clothing, apparel and other levels, but also on the exposed area, costume design and garment processing conditions are closely related to the shielding effectiveness of anti-electromagnetic radiation clothing.But the extent of the influence factors and the mechanism of these factors on the shielding effectiveness of anti-electromagnetic radiation clothing is still at the primary experimental stage. So far, there is not a reasonable approach about the shielding effectiveness of the evaluation mechanism.At present, in the electromagnetic shielding clothing research mainly used the experiment method for testing the shielding effectiveness value.In this paper established some FDTD model applied to clothing by the the finite difference time domain method which was widely used in electromagnetic area.First of all, according to the finite difference time domain equations and periodic boundary condition establish a two-dimensional periodic structure of metal net simulation model of equivalent clothing closed area; according to the finite difference time domain equations and the PML absorbing boundary establish a equivalent plate model of gap region and hole area.Then, using the EastFDTD software to obtain the results of the observation point in time domain and frequency domain in the equivalent simulation model on the local area of clothing.And using MATLAB mathematical processing tools and Origin tools to deal with the calculation results,then getting the local clothing shielding effectiveness curve.Then, design the shielding effectiveness test of the local area of clothing.Using the waveguide silver fiber shielding method to test the untreated silver fiber fabric, the silver fiber fabric with gap and the silver fiber with hole. cavity treated fabric.Getting the changes of shielding effectiveness by the further analysis.Finally, comparison and analysis the calculation result of FDTD and the waveguide test results, verify the feasibility of the finite difference time domain method in the calculation of the local clothing shielding efficiency.The research result is helpful for the establishment of a suitable for shielding effectiveness test method of electromagnetic radiation proof clothing, has the certain theory value to study on the electromagnetic shielding clothing, provide theoretical foundation for the optimal design and also anti electromagnetic radiation clothing for the high performance, has a certain practical application value.