Abstract: The invention relates to a ferrite material of garnet structure based on yttrium and iron and containing copper, which makes it possible for its sintering temperature to be substantially lowered compared with the conventional ferrite materials of garnet type which satisfy the following chemical formula: YaREbFecAldIneCafCugZrhViCojSikO12±? where RE: is a rare earth or a combination of rare earths and 3(a+b+c+d+e)+2(f+g+j)+4(h+k)+5i=24±2? 1?a?3.5; 0?b?1.5; 4?c?5; 0?d?1.5; 0?e?0.8; 0?f?1; 0?g?0.05; 0?i?0.8; 0?j?0.5; 0?k?0.5. The invention is useful in the following applications: microwave components, low-loss inductive passive components operating at frequencies of the order of gigahertz.

Abstract: The present invention relates to a security document having a contactless chip with data masking. The security document comprising a transponder of an electronic module connected to an antenna placed on a given surface of a first part of the document, said transponder serving to remotely communicate with a reader via an electromagnetic coupling, and also comprises a passive masking element of said antenna, which is supported by a second part of the document and can move relative to said first part, said masking element being capable of interfering with the coupling between the transponder and the reader for rendering the reading of the document impossible when said second part is in a predetermined position that corresponds to a closed position of the document.

Abstract: A ferrite material based on nickel, copper and zinc has the following formula: NixZnyCuzCo&egr;Fe2±&dgr;O4 in which: x+y+Z+&egr;=1±&dgr; &dgr;≦0.05 0.04≦&egr; 0.05≦z≦0.35 A material of this kind has the advantage of showing reduced losses.

Abstract: A composite magnetic material showing reduced losses and reduced permeability when it is subjected to a magnetic field at frequencies below approximately 100 MHz. It comprises magnetic particles in the form of wafers dispersed in a dielectric binder. The polycrystalline magnetic ceramic wafers are oriented so that their main faces are substantially parallel to the magnetic field.Application especially to cores of inductors or transformers.

Abstract: Disclosed is a ferrite material having low magnetic losses at frequencies of about 1 megahertz to 100 megahertz, and having firing and sintering temperatures lower than about 1000.degree. C. The material is a nickel-zinc-copper material with cobalt substitution, particularly well suited to the making of magnetic cores and more specifically to the making of micro-inductors.

Abstract: A magnetic core includes a body made of polycrystalline ceramic and at least one localized gap made of a composite magnetic material. The gap may be preferably fixedly joined to the body by bonding or molding. The magnetic core has applications in inductors or transformers. The inductor preferably has a coil located on the body, which coil is preferably made of multistranded enameled wires.