Various embodiments relating to an electronic device comprising an accessory are described. An electronic device according to one embodiment comprises: a first electronic device forming a first curved surface on at least one side and including at least one first magnet on the first curved surface; a second electronic device forming a second curved surface on at least one side and including at least one second magnet on the second curved surface; and an accessory structure including third and fourth curved surfaces facing the first and second curved surfaces, and including at least one third and fourth magnets on the third and fourth curved surfaces, wherein the accessory structure may attach and detach the at least one first and second magnets and the at least one third and fourth magnets by magnetic force, may rotate the first and second curved surfaces along the third and fourth curved surfaces, and may be bent during rotation so as to mount the first electronic device at various angles. Other various embodiments are also possible.

A near-field communication (NFC) circuit includes a transmitter that generates a transmission signal based on a reference clock signal and transmits the transmission signal through an antenna; a clock recovery circuit that receives a detection signal through the antenna responsive to the transmission signal and recovers a recovered clock signal from the detection signal; a phase detector that detects a phase change of the recovered clock signal; and a controller that determines, based on the phase change of the recovered clock signal, whether an NFC tag external to the NFC circuit is located within a communication range of the NFC circuit.

The invention relates to a rotation information transmission apparatus where wireless communication of data of several Gbps is made possible without miniaturizing the coupler to such an extent that installation is difficult. A first substrate where a first coupler in arc form is provided in an upper portion or a lower portion and a second substrate where a second coupler in arc form of which the length of the arc is shorter than that of the first coupler in arc form is arranged in a location where coupling with the first coupler in arc form is possible are arranged so as to rotate relative to each other by fixing either the first substrate or the second substrate to a non-movable portion and fixing the other of the first substrate or the second substrate to a rotational member.

Within many applications impulse radio based ultra-wideband (IR-UWB) transmission offers significant benefits for very short range high data rate communications when compared with existing standards and protocols. In many of these applications the main design goals are very low power consumption and very low complexity design for easy integration and cost reduction. Digitally programmable IR-UWB transmitters using an on-off keying modulation scheme on a 0.13 microns CMOS process operating on 1.2V supply and yielding power consumption as low as 0.9 mW at a 10 Mbps data rate with dynamic power control are enabled. The IR-UWB transmitters support new frequency hopping techniques providing more efficient spectrum usage and dynamic allocation of the spectrum when transmitting in highly congested frequency bands. Biphasic scrambling is also introduced for spectral line reduction. Additionally, an energy detection receiver for IR-UWB is presented to similarly meet these design goals whilst being adaptable to address IR-UWB transmitter specificity.

A method includes obtaining, by a first device, BLUETOOTH connection information of a second device, obtaining, by the first device according to the BLUETOOTH connection information, a BLUETOOTH signal from the second device, determining, by the first device according to the obtained BLUETOOTH signal from the second device, position information of the second device, and sending, by the first device, the position information to a third device.

Electric field communication that adopts a metal as a communication medium is performed. An electric field communication system communicating through an electric field, includes: a communication medium made of a material capable of transmitting the electric field; a first transmitter that generates an electric field dependent on a potential difference between a first electrode, which is disposed on a side of the communication medium and is connected to the communication medium via a coupling capacitance, and a second electrode connected to an earth ground via a coupling capacitance, with the first electrode being connected on a signal side of the transmitter, and the second electrode being connected on a ground side of the transmitter; and a first receiver disposed in contact with the communication medium, wherein the first transmitter and the first receiver communicate with each other through the electric field via the communication medium.

A mobile device, a host device, and an X-ray detector are provided. The mobile device includes a first communicator configured to receive identification information of the X-ray detector from the X-ray detector, and a second communicator configured to send the received identification information of the X-ray detector to the host device.

Methods and apparatus for bi-directional communication between first and second die of a signal isolator for feedback and/or diagnostic signals. In embodiments, the first and second die can be matched.

To provide a calibration system and a calibration method capable of measuring the amplitude and the phase of the radio signal on the electromagnetic radiation surface of the measured antenna, even in the case where the interval between antenna elements is narrow. The calibration system 1 includes: an antenna control unit 16 that selects and excites a combination of antenna elements from among a plurality of antenna elements provided in the measured antenna 100 and thereafter selects and excites another combination of antenna elements; and a probe antenna 12 that receives an electromagnetic wave of the radio signal transmitted from the combination of the antenna elements at a plurality of measurement positions set within a predetermined measurement plane P of the near field area of the measured antenna 100, each time a combination of the antenna elements selected by the antenna control unit 16 are switched.

A heat transfer system between a heat source and a heat sink, wherein the heat transfer contact surfaces comprise a metal which forms numerous voids when placed adjacent one another. A thermal pad comprising a polymer filled with ceramic particles is placed between these heat transfer surfaces to intimately contact each of the metal surfaces without void formation, thereby increasing thermal conductivity. The heat source and heat sink are joined by relative sliding motion. This sliding motion might damage the thermal pad. Thus, a hot swap structure is provided for controlling the movement of the thermal pad into contact with the heat source as the sliding motion is completed.