2 results about "Electromagnetic wave absorption" patented technology

This invention relates to a high fire-retarding electromagnetic wave absorption foam edgetone material including rigid phenolic foam and a wave absorbent, in which, the rigid phenolic foam is taken as the carrier to prepare wedge and the wave absorbent is scattered in the wedge. The preparation method includes: a, preparing resol as the basic material, b, taking the expandable phenolic resin prepared by the resol, a emulsifying agent, vesicant and wave absorbent as component A and a solidifying agent of the resin mixed by inorganic acid and organic acid as component B, c, pouring component A and B together into a wedge model cavity, d, controlling the temperature of the cavity at 50-70deg.C to be foamed and molded and the foam is aged for 60-90min in the cavity.

A semiconductor device is provided that has high electromagnetic wave shielding properties while exhibiting good heat dissipation. The semiconductor device includes a semiconductor package bonded onto a circuit board, an electromagnetic wave absorbing layer covering surfaces of the semiconductor package other than a surface bonded to the circuit board, and an electromagnetic wave reflecting layer covering the electromagnetic wave absorbing layer on a side remote from the semiconductor package, in which the electromagnetic wave absorbing layer is made of resin containing magnetic particles or carbon, and the electromagnetic wave reflecting layer is made of resin containing conductive particles.