Apparatus, system and method to provide switchable coils in a computing device, comprising: a plurality of electrically conductive coils to transfer electromagnetic energy; a sensor coupled to a processor, to select a coil from among the plurality of electrically conductive coils; a switch to energize the selected coil; and a switch controller coupled to the switch and to the processor. In some embodiments, the plurality of coils may comprise an inductive charging interface. Some embodiments may further include a communication interface between the processor to the plurality of electrically conductive coils, the plurality of coils comprising an interface for near-field communications (NFC). The antenna coils may be arranged to provide improved NFC coverage when the computing device is in a respective predetermined physical configuration. Sensors may be used to detect the configuration and switch NFC communications to use a preferred antenna coil for the detected configuration.

A power transmitter (101) comprises a driver (201) generating a drive signal for a transmitter coil to generate a power transfer signal during a power transfer time interval and an electromagnetic test signal during a measurement time interval. A set of balanced detection coils (207, 209) comprise two detection coils arranged such that signals induced in the two detection coils by an electromagnetic field generated by the transmitter coil compensate each other. An estimation circuit (205) determines a position/coupling factor estimate for the power receiver (105) in response to signals from the plurality of sets of balanced detection coils (207, 209) during the at least one measurement time interval.

A near field communications (NFC) transponder includes a transmit circuit coupled to a transmit antenna and a receive circuit coupled to a receive antenna. The transmit/receive antennae are configured such that no signal is induced on the receive antenna by operation of the transmit antenna. Advantageously, this permits continued reception by the receive antenna while the transmit antenna is used for transmission using active load modulation.

[Object] To provide an antenna apparatus which can allow a user to freely select service which utilizes the electromagnetic field communication technology. [Solution] Provided is an antenna apparatus including: a first antenna configured to generate a magnetic field by flow of a current; and a module unit including a second antenna whose opening area is smaller than an opening area of the first antenna and which is able to be electromagnetically coupled with the first antenna, and a module configured to operate by a current generated by the second antenna through electromagnetic coupling between the first antenna and the second antenna. The module unit is able to be attached to and removed from the first antenna.

An electronic device is provided The electronic device includes a housing including a first surface facing a first direction, a second surface facing a second direction opposite to the first direction, and a side member configured to enclose at least some of a space between the first surface and the second surface, a first conductive coil positioned inside the housing and configured to form a first magnetic field in a direction substantially perpendicular to the first direction or the second direction, a second conductive coil spaced apart from the first conductive coil within the housing and configured to form a second magnetic field in a direction substantially parallel to the first direction or the second direction, a communication circuit positioned inside the housing and electrically connected to the first and second conductive coils, and a processor positioned inside the housing and electrically connected to the communication circuit.

A Near Field Communication (NFC) reader can wirelessly cooperate with a rectangular prism-shaped transponder having an NFC transponder antenna. The NFC reader includes an NFC controller, a matching network coupled to the NFC controller, and a receptacle capable of at least partially holding the transponder. The receptacle has a bottom wall, a lateral wall and a shape designed such that the transponder cannot be placed in the receptacle in a direction where the NFC transponder antenna is parallel to the bottom wall. The receptacle includes first and second NFC reader antennas located in two non-parallel parts of the lateral wall and a connection coupling the first and second reader antennas to the matching network.

An unwanted process is prevented from being performed due to near field communication based on a process performed via an antenna which is not intended by a user. An information processing apparatus (1) includes a communication antenna determination unit (22) configured to, when a proximity state of an NFC terminal (10) to an NFC antenna (12) continues, determines that the NFC antenna (12) is an NFC antenna (12) that performs near field communication for executing a prescribed process.

A system for an antenna for near field communications (NFC), said antenna comprising a primary loop with a primary current to produce a magnetic field; one or more secondary loops with one or more secondary currents; wherein by adjusting one or more variables associated with said one or more secondary loops, said magnetic field is modified to ensure antenna operation within a defined operating range.

An apparatus, device, and charging system are provided. The apparatus comprises a primary stationary receive coil and a secondary rotatable receive coil, the primary stationary receive coil being electronically coupled to the secondary rotatable receive coil. The secondary rotatable receive coil provides a charge mode position when rotated in a same plane as the primary stationary receive coil. The secondary rotatable receive coil provides non-charge mode position when retracted back against the primary stationary receive coil. The coils may be coupled is series and or parallel configurations. The primary stationary receive coil may be integrated within or appended to a housing. The secondary rotatable receive coil may be integrated within or coupled to a rotatable clip coupled to the housing. Rotation of the clip extends a charging configuration with which to charge the primary stationary receive coil and the secondary rotatable receive coil.

A wireless charging coil assembly comprises a first stamped coil having a first trace, a second stamped coil having a second trace, and a film having a first side and a second side. The first stamped coil is adhered to the first side of the film and the second stamped coil is adhered to the second side of the film. At least a first portion of the first trace of the first stamped coil and at least a first portion of the second trace of the second stamped coil are electrically connected.