ELECTROMAGNETIC INTERFERENCE (EMI) SHIELDING WITH CONDUCTIVE AND NON CONDUCTIVE MATERIALS
Electromagnetic interference (EMI) is a common problem encountered by electronic devices. External electromagnetic (EM) waves affect the operation of an electronic device by interfering with the internal EM signals. To provide EMI shielding, various materials were studied, and the measured electromagnetic shielding effectiveness (SE) data are presented in this study. Long steel fiber Celstran® LFRT materials provide the best EMI SE, at over 60 dB at frequencies ranging from 30 MHz to 18 GHz, and at thicknesses as low as 1.6 mm. It also demonstrated that thermally conductive CoolPoly® TCP carbon filled products provide shielding at levels greater than 50 dB. Materials with non-conductive fillers are shown to have SE higher than 60 dB when coated with silver. This is achieved with a coating thickness as low as 1 micron.
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