Patent ID: 8378877

Claim:
A porous magnetic material capable of absorbing, disseminating, reflecting or concentrating electromagnetic radiation with frequencies in the range from 10 kHz to 100 GHz comprising: a) a polymer substrate made of foamed polymers having porous structure, and b) particles embedded in the substrate, the particles having a diameter of about 1 nanometer to 100 micron and made of a magnetic or dielectric material selected from the group consisting of Fe, Co, Ni, Cr, rare-earth metals, various ferrites, such as ferrites of type MFe 2 O 4 (where M=Mn, Ni, Cu), Ni—Zn ferrite, barium hexaferrite, iron-nickel alloys, iron-cobalt alloys, alloys based on rare-earth metals Nd—Fe—B, Sm—Co, Fe—B—Co—R (where R is a rare-earth element), or a combination thereof, wherein the said particles are aligned within the polymer substrate in continuous conductive lines to form a three-dimensional waveguide structure or a plurality of structures having at least one characteristic dimension selected from the width and length of the said conductive line, which is proportional to at least one wave length or wave length range of the said absorbed, disseminated, reflected or concentrated electromagnetic radiation.