Abstract: The invention relates to a material configured such as to include a plurality of layers, some layers being made of a composite material and some layers being made of a dielectric material. The layers of composite material include a mixture of host dielectric material and inclusions, such that said inclusions are embedded in the structure of the host dielectric material. Said inclusions preferably include highly conductive fibres, specifically metal microwires. Thus, the structure of the material according to the invention includes a plurality of layers, some layers being made of a composite material, which includes a host dielectric material with inclusions, and some layers being made of a dielectric material. The structure of the material according to the invention is designed so that the surface on which said material is applied is capable of absorbing a portion of the incident electromagnetic radiation, thus substantially reducing the electromagnetic radiation reflected by same curved.

Abstract: The present invention relates to a paint with metallic microwires, to the process for integrating metallic microwires to obtain such paint, and to a process for applying said paint on metallic surfaces (1). The process for applying paint is performed in several steps: applying a first coat (2) of primer on the metallic surface; applying on the first coat (2) a second coat (3, 3?) of paint; applying on said second coat (3) an active third coat (4) of a paint containing microwires; and sanding said active third coat (4) with fine grain sandpaper to remove the microwires oriented perpendicular to the plane of the metallic surface; the maximum attenuation frequency of the reflectivity of said electromagnetic radiation being determined within of the range of maximum attenuation frequencies given by the composition of the paint with microwires, and by the thicknesses and dielectric constants of the different coats.

Abstract: The present invention relates to a paint with metallic microwires, to the process for integrating metallic microwires to obtain such paint, and to a process for applying said paint on metallic surfaces (1). The process for applying paint is performed in several steps: applying a first coat (2) of primer on the metallic surface; applying on the first coat (2) a second coat (3, 3?) of paint; applying on said second coat (3) an active third coat (4) of a paint containing microwires; and sanding said active third coat (4) with fine grain sandpaper to remove the microwires oriented perpendicular to the plane of the metallic surface; the maximum attenuation frequency of the reflectivity of said electromagnetic radiation being determined within of the range of maximum attenuation frequencies given by the composition of the paint with microwires, and by the thicknesses and dielectric constants of the different coats.

Abstract: The invention relates to an electromagnetic radiation attenuator and a method for controlling the spectrum thereof. The attenuator of the invention is formed from an attenuating sheet located such that, in the position of use of the attenuator, said electromagnetic radiation is incident on the attenuator sheet, and from a conductive base located, in the position of use of the attenuator, beneath said attenuator sheet. The attenuator sheet is formed by two layers, the first layer, made of dielectric material and of thickness d3, being located directly on the metal sheet, and the second layer, of thickness d2 formed by a dielectric material containing non-magnetic metal microwires with an insulating sheath of 1 to 2 mm in length, being located on the first layer and coating the whole, with the particularity that the second sheet is formed from a mixture of paint and microwires applied on the first sheet.

Abstract: A method and system for the characterization of a magnetic element based on ferromagnetic resonance, the magnetic element presents ferromagnetic resonance and its own characteristic resonance frequency. The system includes mechanism for application of a low-frequency electromagnetic field in a given area; a mechanism for application of a high-frequency electromagnetic wave the same as the characteristic resonance frequency of the magnetic element in the same area; and a control unit configured so as to control the simultaneous application of the low-frequency electromagnetic field so that in response to the introduction of the magnetic element in the area the magnetic element absorbs the high-frequency electromagnetic wave with a frequency the same as that of the low-frequency electromagnetic field, so the wave is modulated.

Abstract: The invention refers to a magnetic tag that can be activated/deactivated, formed by at least two components based on magnetic microwire, characterized in that: the first component comprises a first array of soft magnetic microwire segments (1) with a bistable magnetic behaviour, said segments arranged in a substantially aligned manner in a direction parallel to the axial direction of the microwire, and the second component comprises a second array of hard magnetic microwire segments (2), said hard magnetic microwire segments preferably being of substantially the same length, and are arranged equidistantly from each other and substantially aligned in a direction parallel to that of the first component. The invention also refers to a method for obtaining a tag that can be activated/deactivated based on magnetic microwire.

Abstract: It concerns an activatable/deactivatable magnetomechanical marker, based on magnetic microwires, in which participates a non-bistable, magnetoelastic, soft magnetic microwire (1) with induced transversal magnetic anisotropy and with magnetoelastic resonance frequency of 58 kHz, and a second hard magnetic microwire (2), thereby achieving a substantial reduction in the size of the marker. The procedure for obtaining the same consists firstly in obtaining a soft magnetic microwire with non-bistable magnetic behaviour, which undergoes a heat treatment in the presence of transversal magnetic field sufficient to saturate the sample at a temperature below that of crystallization of the amorphous alloy, cutting said magnetic wire to the appropriate length so that its magnetoelastic resonance coincides with that of the detecting unit, and finally obtaining a hard magnetic microwire (2) which together with the soft microwire are mounted on the mechanical support (3) of the marker.

Abstract: The invention relates to an electromagnetic radiation absorber for a preselected frequency range, comprising: an absorbent sheet (10) located such that said electromagnetic radiation falls on it, and a conductive base (20) located under said absorbent sheet, wherein said absorbent sheet: has a total thickness e exceeding ?/(?)1/24, where ? is the wavelength of the incident electromagnetic radiation, and is made up of a dielectric material containing amorphous magnetic microwires, the magnetic permeability of which in the preselected frequency range has an imaginary part ?? which is at least 100 times greater than the corresponding real part ??, said microwires being distributed in a volume having a thickness e2 of at least ?/(?)1/216, where ? is the dielectric constant of the absorbent sheet and said volume is located a distance e3 from the conductive base that is not less than ?/(?)1/28.

Abstract: The invention refers to a magnetic tag that can be activated/deactivated, formed by at least two components based on magnetic microwire, characterized in that: the first component comprises a first array of soft magnetic microwire segments (1) with a bistable magnetic behaviour, said segments arranged in a substantially aligned manner in a direction parallel to the axial direction of the microwire, and the second component comprises a second array of hard magnetic microwire segments (2), said hard magnetic microwire segments preferably being of substantially the same length, and are arranged equidistantly from each other and substantially aligned in a direction parallel to that of the first component. The invention also refers to a method for obtaining a tag that can be activated/deactivated based on magnetic microwire.

Abstract: The invention relates to an electromagnetic radiation absorber for a preselected frequency range, comprising: an absorbent sheet (10) located such that said electromagnetic radiation falls on it, and a conductive base (20) located under said absorbent sheet, wherein said absorbent sheet: has a total thickness e exceeding ?/(?)1/24, where ? is the wavelength of the incident electromagnetic radiation, and is made up of a dielectric material containing amorphous magnetic microwires, the magnetic permeability of which in the preselected frequency range has an imaginary part ?? which is at least 100 times greater than the corresponding real part ??, said microwires being distributed in a volume having a thickness e2 of at least ?/(?)1/216, where ? is the dielectric constant of the absorbent sheet and said volume is located a distance e3 from the conductive base that is not less than ?(?)1/28.

Abstract: An amorphous microwire coated with an insulating sleeve, composed of a metal core made up of an alloy of transition metals and metalloid elements, at a proportion between 65%–90% and 10%–35%, respectively, and an insulating glass sleeve, the transition metals are at least iron, the relative proportion of iron being between 65%–100% of the total transition metals, and the core diameter (Dc) is comprised between 2 ?m and 20 ?m, such that the magnetostriction constant (?) of the metal alloy is comprised between 1 and 30 ppm, and the natural ferromagnetic resonance frequency is comprised between 3 and 20 GHz. The invention also refers to a method for the manufacture of an amorphous microwire.

Abstract: An amorphous microwire coated with an insulating sleeve, consisting of a metal core made up of an alloy of transition metals and metalloid elements, at a proportion between 65%-90% and 10%-35%, respectively, and an insulating glass sleeve; the transition metals are at least iron, the relative proportion of iron being between 65%-100% of the total transition metals, and the core diameter (Dc) is comprised between 2 ?m and 20 ?m, such that the magnetostriction constant (?) of the metal alloy is comprised between 1 and 30 ppm, and the natural ferromagnetic resonance frequency is comprised between 3 and 20 GHz. The invention also refers to a method for the manufacture of an amorphous microwire.