Heat-conductive electromagnetic noise suppression sheet and preparation method thereof

Abstract

The invention belongs to the technical field of electromagnetic noise absorption, and discloses a heat-conductive electromagnetic noise suppression sheet and a preparation method thereof, the heat-conductive electromagnetic noise suppression sheet comprises an organic silicon resin-based wave-absorbing medium top layer, an organic silicon resin-based wave-absorbing medium bottom layer, and an electromagnetic band gap structure layer embedded between the organic silicon resin-based wave-absorbing medium top layer and the organic silicon resin-based wave-absorbing medium bottom layer; each organic silicon resin-based wave-absorbing medium layer is an organic silicon resin and electromagnetic wave absorber composite; the electromagnetic band gap structure layer comprises a plurality of metalfoil grids and a wave-absorbing medium layer, the metal foil grids are uniformly distributed and fixed on the wave-absorbing medium layer; a heat conduction network is constructed in an organic silicon resin-based wave-absorbing medium by use of an electromagnetic band gap structure, by use of electromagnetic wave regulation characteristics, wave absorbing ability is enhanced, the thermal conductivity and the electromagnetic noise suppression capability of the heat-conductive electromagnetic noise suppression sheet can be significantly improved, and the wave-absorbing bandwidth and the centerfrequency loss intensity are significantly improved compared with the existing heat-conductive electromagnetic noise suppression sheet.

Description

Technical field [0001] The invention belongs to the technical field of electromagnetic noise absorption, and specifically relates to an electromagnetic noise suppression sheet with high thermal conductivity and strong wave absorption with an electromagnetic band gap structure and a preparation method thereof. Background technique [0002] Thermally conductive electromagnetic noise suppression sheet is a composite material with strong attenuation and absorption of electromagnetic noise signals and good heat dissipation characteristics. It has the characteristics of flexibility and mountability, wide application frequency range, etc., which can effectively solve the problem of electronic equipment under high-frequency working conditions. The scattering and electromagnetic interference problems of the electronic equipment provide technical support for the integrated and high-frequency design and development of electronic equipment. [0003] Traditional thermally conductive electromagn...

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Problems solved by technology

Although this type of traditional material can improve the thermal conductivity and absorbing performance of the composite system to a certain extent by adjusting the process parameters such as the type and filling ratio of the heat conducting agent and absorbing agent; however, it is limited by the composition and structure of the absorbing patch. The adjustment range, the filling ratio of the thermal conductive agent and the absorbent are mutually restricted, and it is difficult to meet the compatible design requirements of material heat dissipation performance and electromagnetic noise suppression in a wide frequency range

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