RF Power Absorption Enhancement by Optimization of the Conductive Grid in a Magnetic Composite

Electromagnetic noise suppression was studied by near-field power absorption of a magnetic composite film composed of magnetic fillers and metallic mesh grid in nonmagnetic matrix, which were simulated using a commercial finite-element electromagnetic solver. The geometrical characteristics of the grid on the power absorption were evaluated using the transmission line method with a microstrip line. For conductive grid spacing and the period of lines composing a grid, maximum power absorption was obtained when the width of microstrip signal line was comparable with the grid spacing. The vertical position of the grid in magnetic composite was suggested to be at the center or top position of the composite for higher power absorption. The power absorptions and bandwidth of frequency were enhanced using thin metallic grid on magnetic composite in comparison with that of thick metallic grid.