166 results about "Ferrite layer" patented technology

A coil apparatus includes a first housing and a second housing that surroundingly encloses the first housing. The first housing has a coil arrangement disposed therein. The coil arrangement includes a ferrite layer and a thermally-conductive silicone layer that overlies the ferrite layer. A wire conductor surrounds the first housing. A structure is received in a opening defined in the first housing to be in thermal communication with the thermally-conductive silicone layer. Another thermally-conductive silicone layer overlies the first housing and the structure so that the structure is also in thermal communication therewith. A metal layer further overlies the thermally-conductive silicone layer that overlies the first housing. The second housing includes a non-dielectric cover and a dielectric cavity portion that receives the coil arrangement. The coil apparatus is associated with an electrical charging system (ECS) that electrically charges an energy storage device (ESD) disposed on a motorized vehicle.

The invention relates to electronic devices with parasitic antenna resonating elements that reduce near field radiation. Antennas are provided for electronic devices such as portable computers. An electronic device may have a housing in which an antenna is mounted. The housing may be formed of conductive materials. A dielectric antenna window may be mounted in the housing to allow radio- frequency signals to be transmitted from the antenna and to allow the antenna to receive radio-frequency signals. Near-field radiation limits may be satisfied by reducing transmit power when an external object is detected in the vicinity of the dielectric antenna window and the antenna. A proximity sensor may be used in detecting external objects. A parasitic antenna resonating element may be interposed between the antenna resonating element and the dielectric antenna window to minimize near-field radiation hotspots. The parasitic antenna resonating element may be formed using a capacitor electrode for the proximity sensor. A ferrite layer may be interposed between the parasitic element and the antenna window.

The present invention relates to a method of manufacturing a ferrite rod. The method comprises etching cavities into two semiconductor substrates and depositing ferrite layers into the cavities. The semiconductor substrates are attached to each other such that the ferriote layers form a ferrite rod. The present invention employs conventional photolithography and bulk isotropic micromachining of semiconductor wafers to precisely and repeatably form a template or mould, into which magnetic material can be deposited to form a Faraday rotation or phase-shifting element.

A carrier for an electrophotographic developer which is used as an electrophotographic developer in a mixture with a toner and which secures sufficiently the image density and can maintain high-quality images for a long period, and an electrophotographic developer using the carrier, are provided. A resin-filled ferrite carrier for electrophotographic developer obtained by filling, with a resin, avoid of a porous ferrite core whose void continues from the surface to reach the interior of the core, the carrier comprising a plurality of three-dimensional laminate structures in which resin layers and ferrite layers are alternately present, and an electrophotographic developer including the carrier and a toner, are employed.

A card having a metal layer and an opening or cut-out region in the metal layer, with a dual-interface integrated circuit (IC) module disposed in the opening or cut-out region. A ferrite layer is disposed below the metal layer and a booster antenna is attached to the ferrite layer. A vertical hole extends beneath the IC module through the ferrite layer. The booster antenna may be physically connected to the IC module or may be configured to inductively couple to the IC module. In some embodiments, the IC may be disposed in or on a non-conductive plug disposed within the opening or cut-out region, or the vertical hole may have a non-conductive lining, or a connector may be disposed between the booster antenna and the IC module in the vertical hole.

This invention relates to magneto-optical recording media such as magneto-optical disks and cards, manufacturing methods of the medium and a magneto-optical recording and playback device to record and play back data using the magneto-optical recording media. The magneto-optical recording medium of the present invention has a recording layer and a reflective layer on a substrate, and the recording layer has a layered structure in which at least one spinel ferrite (or rutile-type oxide or hematite) layer and at least one garnet ferrite layer are piled together. It is preferable that the layered structure is formed on tracks where data are recorded. The manufacturing method of the present invention comprises the steps of heat treatment in the range of 500-700° C., preferably 600-630° C., after the formation of the recording layer. In the magneto-optical recording and playback device to record and play back data of the present invention, the wavelength of light for recording data is different from that for reading data, which is preferable for a magneto-optical recording medium comprising a garnet ferrite layer.

A filter device may include a plurality of ferrite filters laminated together in vertically stacked relation, where each ferrite filter may include a pair of ferrite layers laminated together in vertically stacked relation and a lateral conductor extending therebetween. The filter device may also include at least one vertical conductor connecting the lateral conductors together in series. Moreover, at least some of the ferrite filters may have different operating characteristics. In particular, the different operating characteristics may be different impedance versus frequency characteristics to thereby broaden an attenuation frequency band of the filter device.

A wireless communication device and methods of manufacturing and using the same are disclosed. The wireless communication device includes a substrate with an antenna and/or inductor thereon, a patterned ferrite layer overlapping the antenna and/or inductor, and a capacitor electrically connected to the antenna and/or inductor. The wireless communication device may further include an integrated circuit including a receiver configured to convert a first wireless signal to an electric signal and a transmitter configured to generate a second wireless signal, the antenna being configured to receive the first wireless signal and transmit or broadcast the second wireless signal. The patterned ferrite layer advantageously mitigates the deleterious effect of metal objects in proximity to a reader and/or transponder magnetically coupled to the antenna.

The invention provides a ferrite conductive coating for resisting corrosion on electrical engineering earthing devices and a preparation method thereof. The ferrite conductive coating is a composite coating and mainly comprises a bonding base layer and a ferrite layer. The bonding base layer is coated on a base material. The ferrite layer is coated on the bonding base layer. The bonding base layer comprises Al, Zn, Co and Cu metal materials or an alloy material. The ferrite layer comprises a ferrite material having a molecular formula of MFe2O4. The composite coating has good corrosion resistance, electrical conductivity and thermal spraying adaptability. The preparation method has simple processes, a low cost and strong repeatability. The ferrite conductive coating can be used for surfaces of metal bases having different shapes or sizes, has obvious superiority in large-scale preparation of the corrosion-resistant conductive ceramic coating in practical application and is suitable for industrial popularization.

The invention relates to magnetic hollow circular cylinder filler based on residual activated sludge and a preparation method thereof. The magnetic hollow circular cylinder filler based on the residual activated sludge is composed of a matrix, magnetic ferrite layers and biofilm carrier layers, wherein the matrix is a hollow circular cylinder, each of the inner surface and the outer surface of the hollow circular cylinder is covered with a magnetic ferrite layer, and the surface of each magnetic ferrite layer is covered with a biofilm carrier layer. The preparation method comprises the following steps: adopting a cylindrical mould, coating coal ash, yellow sand and cement paste which form the matrix on the surface of the cylindrical mould; after the matrix is formed, separating the matrix from the cylindrical mould, and maintaining the matrix at room temperature; then applying glue on the inner surface and the outer surface of the matrix and covering each of the inner surface and the outer surface of the matrix with a magnetic ferrite powder layer, so as to form magnetic ferrite layers; after the glue is dried and the magnetic ferrite powder is stable, coating slurry forming the biofilm carrier layer on the surface of the magnetic ferrite layer.

The invention discloses a sub-wavelength layered three-dimensional broadband absorbing structure based on a loss type frequency selective surface. The sub-wavelength layered three-dimensional broadband absorbing structure is a periodic array structure formed by a plurality of structural units. Each structural unit consists of four annular frequency selective surfaces a dielectric layer serving asa supporting layer, a ferrite layer arranged at the lower surface of the dielectric layer, and a metal backing plate arranged at the lower surface of the ferrite layer; and the four annular frequencyselective surfaces are uniformly distributed in the dielectric layer in the vertical direction. The ferrite layer uses ferrite with a working frequency lower than 2 GHz; and the annular frequency selective surfaces are made of conductive materials with the electric conductivity of 100-200 S/m. According to the invention, with the sub-wavelength layered three-dimensional broadband absorbing structure, the wide-band absorption of spatial electromagnetic waves is realized. The sub-wavelength layered three-dimensional broadband absorbing structure has advantages of being insensitive to electromagnetic wave polarization, having the light weight, having a simple structure, being easy to process, having the low cost, having the wide working frequency band and having the relative thin thickness.

The invention discloses a ferrite module for electronic equipment. The ferrite module comprises a ferrite layer, wherein the ferrite layer covers on the outer side of an antenna or a coil on the inner side wall of a casing of the electronic equipment; the ferrite layer is provided with an inner side surface and an outer side surface; the inner side surface is provide with a first profile surface of which the shape is consistent with that of the outer surface of the antenna or the coil; the outer side surface is provided with a second profile surface of which the shape is consistent with the inside shape of the electronic equipment opposite to the inner side wall of the casing. The invention also provides a manufacturing method of the ferrite module. The ferrite module for the electronic equipment, which is disclosed by the invention, can provide the ferrite layer which can individually cover the antenna or the coil on the inner side wall of the casing of the electronic equipment according to the shape of the inner side wall of the casing of the electronic equipment, so that the gap between the ferrite layer and the antenna or the coil can be reduced and a better electromagnetic shielding effect can be provided in a narrow space. In addition, according to the manufacturing method disclosed by the invention, the individual large-scale production can be conveniently operated.