Abstract: A wireless energy transmission apparatus wirelessly transmits energy through resonance between a source resonator and a target resonator. The apparatus scans an amount of energy stored in the source resonator for a scanning period, calculates a total amount of energy stored in the source resonator and the target resonator during an off-resonant interval between the source resonator and the target resonator based on the amount of energy scanned, and estimates an amount of energy induced in the target resonator based on the amount of energy stored in the source resonator and the total amount of energy calculated.

Abstract: An apparatus and a method for wirelessly receiving and transmitting energy are provided. A wireless energy receiving apparatus in a terminal configured to wirelessly receive energy through mutual resonance between a resonator of an energy supply apparatus configured to supply the energy and a resonator of the terminal, includes an energy measuring unit configured to measure an amount of energy stored in the terminal. The wireless energy receiving apparatus further includes a control unit configured to change a state of the resonator of the terminal from a non-resonant state to a resonant state when the measured amount of energy is less than or equal to a predetermined threshold.

Abstract: A method and an apparatus for detecting an envelope using a difference between sampling signals are provided. The method includes generating sampling sets based on sampling signals of a modulated signal, and determining a sampling set from the sampling sets. The method further includes determining an envelope component value associated with a sampling signal among sampling signals included in the determined sampling set, based on a difference between the sampling signals included in the determined sampling set, and a difference between sampling signals included in each of the sampling sets other than the determined sampling set. The method further includes detecting an envelope of the modulated signal based on the envelope component value.

Abstract: An apparatus for wirelessly transmitting energy based on a frame is provided. The apparatus includes a transmitter configured to transmit, to at least one reception device, energy in a frame unit through a mutual resonance between a source resonator and a plurality of target resonators, and a controller configured to determine information included in the frame based on whether energy is transmitted to the at least one reception device, or based on whether data is transmitted to the at least one reception device.

Abstract: A method and apparatus for security of communication devices that communicate with each other in a near field are provided. A Near Field Communication (NFC) security apparatus may detect the presence of a neighboring device other than communication devices, based on a change in a near field. In response to detecting the presence of the neighboring device, the NFC security apparatus may control an amount of energy transmitted by the communication devices such that the neighboring device may be prevented from accurately receiving a signal transmitted between the communication devices.

Abstract: A method and apparatus for detecting an envelope are provided. The method and apparatus may detect an envelope of a modulating signal based on a low calculation complexity and a simple circuit configuration, by detecting an envelope for a plurality of sampling signals with equal time intervals.