Optimization Design And Preparation For Construction Absorbing Materials

With the rapid development of information society and the widespread use of electronic machines, it is growing that the density of electromagnetic radiation of Urban Living Space. Electronic products and technology give a huge convenience to people, but also bring about harm. Electromagnetic radiation not only mainly interfere with the electronic machines, making machines appear malfunction, affecting the normal operation of the machine, or even serious accidents and damage, will but also have information leakage and serious information security problems. In addition, the study shows that long working and living under the conditions of electromagnetic radiation will harm people's physical and mental health. Therefore, the WHO has classified electromagnetic radiation as the fourth largest pollution following the water, air, solid waste pollution. Electromagnetic radiation protection has become a great concerned international hot research questions.At present, the foreign in the civilian aspects of anti-electromagnetic radiation material research soon. The domestic is in start level, but has been developed to some extent. Mainly used for electromagnetic shielding and absorbing material protection. We mainly use electromagnetic shielding and absorbing material for protection. Compared with the shielding means, electromagnetic wave absorption can change electromagnetic wave into heat energy directly, and consumed. Fundamentally it could eliminate electromagnetic radiation pollution, more advantages. This paper mainly does the researches about electromagnetic wave absorbing construction materials.This paper uses the advanced theory of electromagnetic wave absorption, with the current main frequency band of electromagnetic radiation pollution as target, doing variety of parameter analysis, theoretical design and simulation for the advanced electromagnetic radiation absorbing material, and uses common gypsum construction materials as object, with fly ash and wood fiber composite, prepared a series of electromagnetic wave absorbers. Finally absorbing materials for electromagnetic radiation pollution has successfully developed which has the features of environmentally friendly and energy-saving.Specifically, firstly, this paper researches the relations between electromagnetic parameters and absorption about dielectric-type electromagnetic wave absorber in band-S by the theory of electromagnetic wave absorption. Receiving:Under the conditions of intended high-reflectivity, we can optimize the electromagnetic parameters, and back step the ideal complex permittivity region to achieve the intended reflectivity under a certain frequency bands, and then choose different materials to prepare high-absorber.Secondly, on the basis ofλ/4 type, by means of theory design and simulation analysis, prepared gypsum, gypsum/wood fiber and gypsum/fly ash electromagnetic wave absorber. Results showed:all of absorbers had the minimum reflectivity over-25dB, and in the band of 2-4GHz, the range of absorbing over-10dB can achieve 60%.Thirdly, prepare gypsum/wood fiber absorber which can be used for wireless LAN EMI protection. The absorber had the minimum reflectivity in 2.45GHz, and in the band of 2-4GHz, the range of absorbing over-10dB can achieve 50%.Fourthly, for bandwidth narrow of single-layer electromagnetic wave absorber, designed and prepared a broad-based type Absorber by using the model of double plasterboard with resistive film. Results showed that we get very good absorption in the band of 2-4GHz, range of absorbing over-15dB can almost achieve 100%, and it is better thanλ/4 model. Further, theoretically design compatible Absorber that had the minimum reflectivity in 2.45GHz and 5.2GHz.