Abstract: A wireless power transmission resonator using a conducting wire with a vertical rectangular cross-section is disclosed. The wireless power transmission resonator may include a first element including a first element upper part arranged in an upper end of a resonator and a first element lower part arranged in a lower end of the resonator, wherein the first element upper part and the first element lower part each may include a spiral layer having a spiral structure that is wound to face a wide surface of a conducting wire including a vertical rectangular cross-section and a second element arranged in a center of the resonator and between the first element upper part and the first element lower part and including a spiral layer having a spiral structure that is wound to face the wide surface of the conducting wire including the vertical rectangular cross-section.

Abstract: A wireless power transmitter that changes an operation frequency and an operation method of the same are provided. The operation method includes controlling the wireless power transmitter to operate at a first operation frequency included in an operation frequency set, changing an operation frequency of the wireless power transmitter from the first operation frequency to a second operation frequency that is different from an operation frequency of a second wireless power transmitter that is adjacent to the wireless power transmitter for every channel duration, and controlling the wireless power transmitter to operate at the second operation frequency.

Abstract: The present disclosure relates to an image processing method for a multi-dimensional region of interest (ROI) in a wireless charging system. More specifically, the method includes determining whether a surveillance target exists in the multi-dimensional ROI by performing, regarding the surveillance target, the process of removing a false-alarm region and including an excluded ROI.

Abstract: A wireless charging system, a method of removing a foreign object in the wireless charging system, and a computing device performing the method are provided. The wireless charging system includes a transmission coil cover mounted to surround a transmission coil of a transmission device, a reception coil cover mounted to surround a reception coil of a reception device, and a direct current (DC) conducting wire attached to each of the transmission coil cover and the reception coil cover, wherein the wireless charging system may be configured to remove a foreign object attached to the transmission coil cover or the reception coil cover by using a force acting on the DC conducting wire according to a direction of a current flowing in the DC conducting wire and a direction of a magnetic field perpendicular to the direction of the current.

Abstract: A resonant coil coupled with an electromagnetic field is disclosed. A Fraunhofer resonant coil includes an upper spiral element and a lower spiral element, an upper conical element connected to the upper spiral element and including one or more layers formed of a plurality of plies, a lower conical element connected to the lower spiral element and including one or more layers formed of a plurality of plies, and a feeding device connected to a gap between the upper conical element and the lower conical element and configured to supply power.

Abstract: Provided is a reflector/scatterer arranged around a side lobe beam which is generated from a transmission antenna, in a radiation direction of the side lobe beam, for use in expanding a communication service coverage area.

Abstract: A radio frequency (RF) weak magnetic field detection sensor includes a ferromagnetic core, a pickup coil disposed to surround the ferromagnetic core, a substrate that includes an opening, a core pad connected to the ferromagnetic core and a coil pad connected to the pickup coil, and an insulating tube interposed between the ferromagnetic core and the pickup coil. The insulating tube includes a bobbin around which the pickup coil is wound, and a core hole formed to pass through the bobbin and configured to accommodate the ferromagnetic core.

Abstract: An apparatus and method for transmitting and receiving magnetic field signals in a magnetic field communication system are provided. The apparatus includes a controller configured to generate a communication signal, matching units that are configured to receive the communication signal and that respectively correspond to different matching frequencies, and loop antennas that are connected to the matching units, respectively, and that are configured to convert communication signals according to the different matching frequencies into magnetic transmission signals in the form of magnetic field energy and to transmit the magnetic transmission signals.

Abstract: Provided is a spiral coil and wireless power transmission and reception circuit including the spiral coil. The spiral coil includes a conducting wire forming one or more coil turns, and a height of one side of the conducting wire in a direction of a central portion of the spiral coil and a height of another side of the conducting wire in an opposite direction to the central portion of the spiral coil in each of the coil turns are different from each other and the conducting wire includes at least one slot formed by an empty space between the one side and the other side, and an upper surface positioned above the one side and the other side and connecting the one side and the other side.

Abstract: Provided is a wireless power reception apparatus. The wireless power reception apparatus includes a resonant circuit including a first path and a second path, the first path including a first capacitor and a first gate connected in series, and the second path being connected in parallel with the first path and including a second capacitor and a second gate connected in series and a reception coil connected to the resonant circuit, configured to wirelessly receive power based on a capacitance of the resonant circuit, and to generate power according to the wirelessly received power, wherein the resonant circuit is configured to determine a gate driving signal to operate the first gate and the second gate and wherein the capacitance of the resonant circuit is determined according to the gate driving signal.

Abstract: Provided is a method of wirelessly transmitting power and a device for performing the method. The wireless power transmission device includes a transmission coil configured to wirelessly transmit power to at least one of a plurality of receivers according to a transmission frequency and a processor configured to control at least one of the transmission frequency or resonant frequencies of the plurality of receivers, and the processor is configured to set the resonant frequencies of the plurality of receivers differently based on the transmission frequency at which the wireless power transmission device wirelessly transmits power, determine a transmission amount of power to be wirelessly transmitted to each of the plurality of receivers, and change at least one of the transmission frequency or the resonant frequencies of the plurality of receivers based on the transmission amount.

Abstract: An antenna device for magnetic field communication may include: a first coil; a second coil; a third coil; a first capacitor connected to a 1-1 terminal of the first coil; a second capacitor connected to a 2-1 terminal of the second coil; a third capacitor connected to a 3-1 terminal of the third coil; and an input port including a first input terminal connected to a 1-2 terminal of the first coil, a 2-2 terminal of the second coil, and a 3-2 terminal of the third coil, and a second input terminal connected to the first capacitor, the second capacitor, and the third capacitor.

Abstract: An antenna for charging and measurement may comprise: a telescopic support installed at a lower portion of an aerial vehicle and configured to contract when the aerial vehicle lands on a wireless station and extend when the aerial vehicle takes off from the wireless station; and an antenna coil part deformed into a spiral shape when the telescopic support is contracted so that the wireless station receives wireless power and deformed into a conical shape when the telescopic support is extended to measure a radio signal.

Abstract: An atomic magnetometer, which operates in a communication system using a magnetic signal in a very low frequency (VLF) band, may comprise: a vapor cell comprising one or more alkaline metal atoms; a pump light source configured to provide circularly polarized pump beams to the vapor cell; an irradiation light source configured to provide linearly polarized irradiation beams to the vapor cell; a magnetic signal detecting unit configured to detect a magnetic signal by measuring a polarization rotation angle from the linearly polarized irradiation beam passing through the vapor cell; and a bias magnetic field control unit configured to control a bias magnetic field applied to the vapor cell.

Abstract: Provided is a spiral coil and wireless power transmission and reception circuit including the spiral coil. The spiral coil includes a conducting wire forming one or more coil turns, and a height of one side of the conducting wire in a direction of a central portion of the spiral coil and a height of another side of the conducting wire in an opposite direction to the central portion of the spiral coil in each of the coil turns are different from each other and the conducting wire includes at least one slot formed by an empty space between the one side and the other side, and an upper surface positioned above the one side and the other side and connecting the one side and the other side.

Abstract: A radio frequency (RF) weak magnetic field detection sensor includes a ferromagnetic core, a pickup coil disposed to surround the ferromagnetic core, a substrate that includes an opening, a core pad connected to the ferromagnetic core and a coil pad connected to the pickup coil, and an insulating tube interposed between the ferromagnetic core and the pickup coil. The insulating tube includes a bobbin around which the pickup coil is wound, and a core hole formed to pass through the bobbin and configured to accommodate the ferromagnetic core.

Abstract: A magnetic field communication method and apparatus using a giant magnetoimpedance (GMI) magnetometer are disclosed. The magnetic field communication apparatus includes a GMI magnetometer configured to detect a first communication signal based on a received magnetic field signal, a first signal extractor configured to extract a second communication signal comprising a message signal from the first communication signal, a second signal extractor configured to extract a third communication signal by removing a magnetization frequency signal from the second communication signal, and a third signal extractor configured to extract the message signal by removing a carrier wave frequency signal from the third communication signal.

Abstract: A radio frequency (RF) weak magnetic field detection sensor includes a ferromagnetic core, a pickup coil disposed to surround the ferromagnetic core, a substrate that includes an opening, a core pad connected to the ferromagnetic core and a coil pad connected to the pickup coil, and an insulating tube interposed between the ferromagnetic core and the pickup coil. The insulating tube includes a bobbin around which the pickup coil is wound, and a core hole formed to pass through the bobbin and configured to accommodate the ferromagnetic core.

Abstract: A wireless power transmitting device includes: an upper coil including a first tubular spiral coil and a first planar spiral coil disposed beneath the first tubular spiral coil; a lower coil including a second planar spiral coil disposed to face the first planar spiral coil and a second tubular spiral coil disposed beneath the second planar spiral coil; a connecting stub configured to connect the upper coil and the lower coil to each other; and a power source configured to supply a power to the upper coil or the lower coil. The first planar spiral coil and the second planar spiral coil generate an electric field and a magnetic field in a resonance state to transfer at least some of the power from the power source to an external wireless power receiving device through the electric field and the magnetic field.

Abstract: A wireless power transmission resonator using a conducting wire with a vertical rectangular cross-section is disclosed. The wireless power transmission resonator may include a first element including a first element upper part arranged in an upper end of a resonator and a first element lower part arranged in a lower end of the resonator, wherein the first element upper part and the first element lower part each may include a spiral layer having a spiral structure that is wound to face a wide surface of a conducting wire including a vertical rectangular cross-section and a second element arranged in a center of the resonator and between the first element upper part and the first element lower part and including a spiral layer having a spiral structure that is wound to face the wide surface of the conducting wire including the vertical rectangular cross-section.