Mobile phone jammer should be inspected periodically

In the deposition of a layer of 30.7 μm ZnS film, shielding effectiveness of materials up to 2 GHz 53 dB. magnetron sputtering technology to prepare the fabric material for inhibiting biological activity of bacteria, anti-UV performance fiber has a distinct role. Yuen, etc. [34], respectively, in argon, oxygen atmosphere, the use of nickel sputtering method, a system of shielding fabric material, obtained by SEM analysis, nickel coating can be effective ultraviolet radiation protection, including the nickel-oxygen atmosphere layer of poly ester fabric protection more effective. cell phone jammer is very popular in the current market. Scholz et al [35] studied different metal coatings of SiO2 fabric biological activity, the results show that copper and silver coated fabrics have good resistance to biological activity performance, the reason may be due to metal ions present in the fabric surface due to present, representative of surface coating materials, the performance characteristics of shielding fabric shown in Table.
the shielding effect does not exceed 40 dB, but strong resistance to oxidative corrosion. cell phone jammer guarantees the security of gas station. [14] with electromagnetic shielding fabric performance requirements increase, a single coating of the screen fabric is often difficult to meet the application requirements, the study of multi-layer composite fabric material is plated in the direction of the current focus of research [15 -17]. Chuke Jing et al [18] In the polyester fabric has been on the electroless copper plating tin-nickel alloy plating, textile materials, prepared smooth surface brightness, low surface resistivity, shielding effect reaches more than 80 dB, and has good decorative effect, completely harmless to humans, but the coating has good resistance to corrosion and abrasion performance. the shielding principle is: the first wave reflection in part of tin-nickel alloy layer and the absorption of small amounts of electromagnetic waves; through the tin-nickel alloy layer of the electromagnetic wave, a large number of reflections in the copper layer, electromagnetic wave shielding layer in a large number of reflections. mobile phone jammer should be inspected periodically.The outer layer of tin-nickel alloy increases the absorption loss, while part of the electromagnetic wave through the tin-nickel alloy, further attenuation, and ultimately achieve efficient shielding effect.