Applications have been investigated in recent years for newly designed electromagnetic radiation absorption materials as measures to restrict electromagnetic radiation from small-sized electronic equipment such as EMC and SAR.
The materials obtained so far have focused on flattening metallic powder mechanically and distributing it in resin to form a structure that absorbs unnecessary electromagnetic radiation.
In this report, we examine a material that aims to confine as much electromagnetic radiation as possible without absorbing it (μ'>μ") as a countermeasure for SAR. We thought that decreasing the eddy current was required to control absorption, and (making particle size minute is effective) to decrease the eddy current. The minute magnetic powder was obtained by the electroless plating method (Titanium Redox Method). The electromagnetic absorption property of a sheet within which this powder was distributed in resin was confirmed, with a frequency μ'>μ", to exceed 1GHz.