Aspects generally relate to adjusting, or lowering, the Q of an inductor. In one embodiment, an integrated circuit includes an inductor and a conductive closed ring inside a periphery of the inductor. In another embodiment, there can be a plurality of closed rings inside the periphery of the inductor. The conductive closed rings are magnetically coupled to the inductor to adjust the Q.

An electrically conductive material configured having at least one opening of various unlimited geometries extending through its thickness is provided. The opening is designed to modify eddy currents that form within the surface of the material from interaction with magnetic fields that allow for wireless energy transfer therethrough. The opening may be configured as a cut-out, a slit or combination thereof that extends through the thickness of the electrically conductive material. The electrically conductive material is configured with the cut-out and/or slit pattern positioned adjacent to an antenna configured to receive or transmit electrical energy wirelessly through near-field magnetic coupling (NFMC). A magnetic field shielding material, such as a ferrite, may also be positioned adjacent to the antenna. Such magnetic shielding materials may be used to strategically block eddy currents from electrical components and circuitry located within a device.

An electrically conductive material configured having at least one opening of various unlimited geometries extending through its thickness is provided. The opening is designed to modify eddy currents that form within the surface of the material from interaction with magnetic fields that allow for wireless energy transfer therethrough. The opening may be configured as a cut-out, a slit or combination thereof that extends through the thickness of the electrically conductive material. The electrically conductive material is configured with the cut-out and/or slit pattern positioned adjacent to an antenna configured to receive or transmit electrical energy wirelessly through near-field magnetic coupling (NFMC). A magnetic field shielding material, such as a ferrite, may also be positioned adjacent to the antenna. Such magnetic shielding materials may be used to strategically block eddy currents from electrical components and circuitry located within a device.

An inductor is provided, comprising: a first ferrite core piece and a second ferrite core piece, each of which are made of substantially similar materials, exhibit desired electromagnetic properties, and which are fashioned in a substantially similar manner and shape, and wherein each of the first and second ferrite core pieces comprises a substantially planar mating surface, a center post, and a wire core assembly channel, and wherein a first substantially planar mating surface of the first ferrite core piece is adapted to planarly mate with a second substantially planar mating surface of the second ferrite core piece; and a wire core assembly adapted to be substantially self-locating and self-centering about a first or second center post when located in a respective first or second wire core assembly channel.

A method and device for wireless power transfer provide the ability for concurrent power transfer on two widely separated bands. A wireless power transmitting device includes two coils respectively configured for transmission at two separate wireless power transmission frequencies. A dedicated current or voltage driver is provided for each of said two coils. A controller causes the current or voltage drivers to selectively or concurrently generate an AC magnetic field at either of the frequencies or both frequencies. A method includes concurrently driving two coils arranged with respect to each other to reduce losses at two separate wireless power transmission frequencies while suppressing eddy currents in the path of one of the two coils.

An electronic device is provided. The electronic device includes a housing and a first coil disposed in the housing and wound around a space formed inside. The housing includes a front cover and a rear cover. The rear cover includes a hole located in a first region of the rear cover that corresponds to the space of the first coil, a first slit that extends from an edge of the rear cover to the hole, and a second slit spaced apart from the first slit and extending from the edge. One end of the second slit is located in a second region of the rear cover that corresponds to the first coil. In addition, various other embodiments recognized through the present specification are possible.

A system and method for integrating a magnetic component within a power converter includes a coil integrated on a PCB. The PCB includes multiple layers and traces on each layer to form a single coil or to form multiple coils on the magnetic component. The PCB further includes at least one opening in the PCB through which a core component may pass, such that the magnetic component is defined by the coils and the core material. To reduce eddy currents built up within the traces, the dimensions of traces on a layer are varied and the position of traces between layers of the PCB are varied. The widths and locations of individual traces are selected to reduce coupling of the trace to leakage fluxes within the magnetic component. A floating conductive layer may also be provided to still further reduce the magnitude of eddy currents induced within the coil.

This application describes a coil. The coil includes an output terminal, an input terminal, and a wire-winding part that is connected between the output terminal and the input terminal. A slot is disposed on at least a part of the wire-winding part, and a depth of the slot in any direction of a cross section of the wire-winding part is less than or equal to a distance between two points that are the farthest away from each other on the cross section of the wire-winding part. The wire-winding part is a metal conductor made through spiral winding. The input terminal and the output terminal are configured to connect the wire-winding part to an external circuit.

Embodiments of the disclosure pertain to a wireless communication device and a method of reading a wireless communication device in which the magnitude of electromagnetically-induced currents in a metal-containing substrate is reduced. The metal-containing substrate has one or more openings therethrough. The device includes an antenna configured to (i) receive one or more first wireless signals from a reader and (ii) transmit or broadcast one or more second wireless signals and an integrated circuit coupled to the antenna. The antenna overlaps with at least one of the one or more openings.

An inductor device includes a conductive coil formed within a dielectric material and having a central core area within the coil. Particles are dispersed within the central core region to reduce eddy current loss and increase energy storage. The particles include magnetic properties.