206 results about "Electromagnetic wave absorber" patented technology

An electromagnetic wave absorber comprising (a) soft ferrite having its surface treated with a silane compound having no functional group, (c) magnetite and (d) silicone, or comprising (a) soft ferrite having its surface treated with a silane compound having no functional group, (b) flat, soft magnetic metal powder, (c) magnetite and (d) silicone, which electromagnetic wave absorber excels in electromagnetic wave absorption, heat conduction and flame resistance, exhibiting less temperature dependence, and which electromagnetic wave absorber is soft, excelling in adhesion strength and further excelling in high resistance high insulation properties and in energy conversion efficiency being stable in MHz to 10 GHz broadband frequency. There is further provided a laminated electromagnetic wave absorber comprising the above electromagnetic wave absorber overlaid with a reflection layer of conductor, which laminated electromagnetic wave absorber can be closely stuck onto an unwanted electromagnetic wave emission source such as a high-speed operating device, having such an adhesive strength that even when stuck to a horizontal glassy-surface ceiling face of resin-made cage, would not fall.

The invention relates to a near infrared absorber based on a graphene/metal nanometer belt structure and belongs to a perfect electromagnetic wave absorber. When incoming wave irradiates a metal nanometer belt array, the magnetic resonance effect is excited by the incoming wave at the metal nanometer belt, energy of the incoming wave is substantially enhanced at a gap of the metal nanometer belt, after upper and lower portions of the metal nanometer belt are respectively added with a graphene layer, electromagnetic wave energy is enhanced, the upper and lower graphene layer effect is enhanced, absorption is further carried out, and the resonance wavelength electromagnetic wave energy is integrally absorbed in a perfect mode. The near infrared absorber is advantaged in that five structure layers are comprised, sequentially comprising a substrate (1), an insulation layer (2), the first graphene layer (3), the metal nanometer belt (4) and the second graphene layer (5), and the specific wavelength can be absorbed to a nearly perfect degree through adjusting structural geometric parameters.