Provided is a smart card that can prevent malfunction in the smart card and improve stability of radio frequency communication by removing interference of an AC signal generated at the antenna terminal of the smart card. The smart card includes: a dual antenna configured of a first antenna and a second antenna for performing radio frequency communication with a card reader; an IC chip electrically connected to the first antenna to perform radio frequency communication through the first antenna; a power generation unit for generating DC power by converting a radio frequency signal received through the second antenna; a control unit for receiving the DC power generated from the power generation unit to control various modules; and a cut-off unit arranged between the first antenna and the IC chip to cut off a radio frequency signal received through the first antenna under the control of the control unit.

A wireless charging system and a method for implementing wireless charging are provided. The wireless charging system includes a bearing surface, a guide rail, a wireless charger, and a driver. On the bearing surface there are multiple regions for placing equipment to-be-charged. The guide rail is located under the bearing surface, and includes a first-direction track. The wireless charger is mounted on the first-direction track under the bearing surface. The wireless charger includes a first slider and a charging circuit. The driver is located under the bearing surface, and includes a first driving circuit connected to the first slider, adapted to changing a location of the wireless charger by driving the first slider to move along the first-direction track.

A wearable article, system, and methods may include a structure configured to enclose a human body part. A first antenna, positioned with respect to the structure, is tuned to communicate, while the wearable article is being worn, according to a first wireless communication modality with a first external antenna. A second antenna, positioned with respect to the structure, is tuned to communicate according to a second wireless communication modality with a second external antenna different than the first external antenna, the second communication modality being different than the first communication modality. A transceiver, coupled to at least one of the first antenna and the second antenna, is configured to communicate via one of the first and second antennas based, at least in part, on the one of the first and second antennas coming into wireless communication contact with a corresponding one of the first and second external antennas.

According to certain embodiments, an electronic device comprises a plurality of coils configured to transmit charging power; a communication circuit; at least one processor; and at least one memory. The at least one memory stores instructions that, when executed by the at least one processor, causes the at least one processor to perform a plurality of operations. The plurality of operations comprises transmitting a first signal for requesting device-related information to a plurality of external electronic devices through the communication circuit, receiving a corresponding plurality of first response signals in response to the first signal from the plurality of external electronic devices through the communication circuit, selecting at least one external electronic device from among the plurality of external electronic devices on the basis of the plurality of first response signals, and upon selecting the at least one selected external electronic device, transmitting a second signal that indicates the at least one selected external electronic device and comprises at least information associated with the plurality of external electronic devices to the plurality of external electronic devices via the communication circuit.

A chip-carrier package includes a data processing system having one or more slave dies, a master die and a system bus. Each slave die includes a slave device and a slave-side wireless bus interface (WBI) coupled to the slave device. The master die includes a master device, one or more bus-side WBIs coupled to the master device. Each bus-side WBI is configured to be wirelessly coupled to at least one slave-side WBI of the one or more slave dies and a system bus. The system bus includes the one or more bus-side WBIs and the slave-side WBIs of the one or more slave-side dies. The system bus is configured to exchange information between the master device and the slave devices of the one or more slave dies.

One example discloses a device including a near-field electromagnetic induction (NFEMI) antenna, including: a first inductive coil having a first end coupled to a first feed connection and a second end coupled to a second feed connection; a second inductive coil, having a first end coupled to either end of the first inductive coil or either one of the feed connections; wherein a second end of the second inductive coil is electrically open-ended; wherein the first inductive coil is configured to receive or transmit near-field magnetic signals; and wherein the second inductive coil is configured to receive or transmit near-field electric signals.

An antenna device includes first and second coils. A portion of the first coil overlaps a coil opening of the second coil, and a portion of the second coil overlaps a coil opening of the first coil. The first coil includes a first coil conductor on a first surface of a base material and a first coil conductor on a second surface. The first coil includes a single-layer portion in which the first coil conductor is only on the first surface of the base material, and the second coil conductor intersects the first coil conductor at a portion facing the single-layer portion on the second surface of the base material.

In an embodiment an apparatus includes a contactless transponder including a contactless interface and a wired interface, wherein the contactless transponder is configured to communicate with a contactless reader according to a contactless protocol through the contactless interface, a wired communication bus connected to the wired interface and at least one module connected to the bus, wherein the transponder is configured so that the reader is a master on the bus when the reader and the transponder communicate.

A wearable article, system, and methods may include a structure configured to enclose a human body part. A first antenna, positioned with respect to the structure, is tuned to communicate, while the wearable article is being worn, according to a first wireless communication modality with a first external antenna. A second antenna, positioned with respect to the structure, is tuned to communicate according to a second wireless communication modality with a second external antenna different than the first external antenna, the second communication modality being different than the first communication modality. A transceiver, coupled to at least one of the first antenna and the second antenna, is configured to communicate via one of the first and second antennas based, at least in part, on the one of the first and second antennas coming into wireless communication contact with a corresponding one of the first and second external antennas.

In an embodiment, a semiconductor device is disclosed that comprises a multiplexer. The multiplexer is configured to receive signals from each of a plurality of transmission coils of a wireless power transmitter as inputs and to output an output signal based at least in part on one of the signals. The semiconductor device further comprises an attenuator connected to the multiplexer that is configured to adjust a voltage of the output signal. The attenuator comprises a variable resistance. The semiconductor device further comprises a plurality of pull down circuits each corresponding to one of the transmission coils. The pull down circuits are configured to selectively clamp the signals received from the corresponding transmission coils to ground.