Electromagnetic interference suppressor

摘要

According to the present invention, there are provided an electromagnetic interference suppression material capable of exhibiting a good low-pass filter characteristic in an extensive frequency band ranging from a low frequency to a high frequency, and an electromagnetic interference suppression sheet using the electromagnetic interference suppression material. When laminating a conductive layer having a surface electrical resistance of 100 to 5000Ω/□ in which 5 to 25% by volume of a conductive carbon is mixed, and a magnetic layer having a magnetic permeability with an actual number portion of 3 to 45 in which a magnetic material is mixed, to each other, it is possible to obtain an electromagnetic interference suppression sheet suitable for high-density packaging of electronic equipments which is excellent in low-pass filter characteristic in a near electromagnetic field.

主权项

1. An electromagnetic interference suppressor consisting of:
a conductive layer comprising a conductive filler and a resin, and a magnetic layer comprising soft magnetic particles and a resin, the conductive layer and the magnetic layer being laminated to each other, in which the conductive layer has a surface electrical resistance of 100 to 5000 Ω/□, wherein the conductive filler is a conductive carbon, and a content of the conductive filler in the conductive layer is 5 to 25% by volume, and wherein a transmission loss of the electromagnetic interference suppressor having a thickness of not more than 100 μm in a measurement using a microstripline fitted thereto is not more than 3 dB as measured at 500 MHz and not less than 10 dB as measured at 3 GHz.