摘要:
A super-regenerative receiver including a super-regenerative oscillator is disclosed. The super-regenerative receiver includes a super-regenerative oscillator for generating an oscillation signal when receiving driving current exceeding a predetermined critical level. The receiver also includes a bias current controller for generating bias current according to an output of the super-regenerative oscillator, and a pulse width controller for receiving a predetermined clock and controlling a width of the clock according to the output of the super-regenerative oscillator. The super-regenerative receiver further includes a quench generator receiving the width-controlled clock from the pulse width controller and generating quench current that varies according to the pulse width of the clock. The driving current for oscillation equals to a sum of the bias current N-times multiplied and the quench current.
摘要:
A quadrature voltage-controlled oscillator comprises a first delay cell outputting first and second phase signals having a different phase; and a second delay cell outputting third and fourth phase signals having a different phase, the third and fourth phase signals crossing the first and second phase signals, respectively. The first delay cell includes a first differential voltage-controlled oscillator connected to a power supply and outputting the first and second phase signals; and a first coupling section including first and second coupling transistors connected to the first differential voltage-controlled oscillator and first and second coupling capacitors connected in parallel to the first and second coupling transistors, respectively, so as to be grounded, the first coupling section coupling the output phase signals. The second delay cell includes a second differential voltage-controlled oscillator connected to the power supply and outputting the third and fourth phase signals; and a second coupling section including third and fourth coupling transistors connected to the second differential voltage-controlled oscillator and third and fourth coupling capacitors connected in parallel to the third and fourth coupling transistors, respectively, so as to be grounded, the second coupling section coupling the output phase signals.
摘要:
Disclosed herein is there is provided an apparatus for transmitting and receiving wireless energy using meta-material structures having a negative refractive index. The apparatus includes a wireless energy transmission unit and a wireless energy reception unit. The wireless energy transmission unit generates wireless energy to be wirelessly transmitted, and then wirelessly transmits wireless energy, which is normally propagated radially, using a magnetic resonance method while concentrating the wireless energy at a single point. The wireless energy reception unit wirelessly receives the wireless energy using the magnetic resonance method while concentrating the wireless energy at a single point.
摘要:
Disclosed herein is a wireless energy transmission structure, which includes a printed circuit board, a disk section, and a wire section. The printed circuit board is formed in a ring type, the disk section is constituted by a first conductive plate and a second conductive plate formed on portions of the printed circuit board corresponding to each other to be spaced by a predetermined gap and a dielectric material inserted between the first conductive plate and the second conductive plate, and the wire section is constituted by a plurality of meta cells having a meta material structure, which are repetitively formed to surround the exterior and interior of the printed circuit board and a transmission line connected to each of the first conductive plate and the second conductive plate and surround the plurality of meta cells.
摘要:
Disclosed are a wireless power transmitter capable of transmitting power wirelessly according to an impedance of an output side and a wireless power transceiver. There are provided a wireless power transmitter and a wireless power transceiver including: a wireless power transmitting unit converting input power into a preset transmission power and transmitting the converted input power wirelessly; and a controlling unit controlling a transmission of the transmission power according to a level of output impedance of the transmission power output from the wireless power transmitting unit.
摘要:
A balun transformer includes a first conductive pattern having one end provided as an input/output port of an unbalanced signal, a second conductive pattern electromagnetically coupled to the first conductive pattern and having both ends provided as input/output ports of a balanced signal, and a first variable capacitor connected between a ground part and a middle part of an electrical length of the second conductive pattern.
摘要:
Disclosed is a method and system for sharing a DRM file between portable terminals. The method includes selecting a DRM file stored in a memory by a transmitting terminal, extracting license information from the DRM file by the transmitting terminal, transmitting the license information to a receiving terminal by the transmitting terminal, checking if the receiving terminal acquires a license by the transmitting terminal, externally receiving the DRM file corresponding to the license by the receiving terminal, and reproducing the DRM file in synchronization with the receiving terminal by the transmitting terminal.
摘要:
A method of constructing a database in a mobile communication terminal includes analyzing one of a file attribute and a database field type of the received file when the file is received, determining whether the analyzed one of the file attribute and the database field type is identical to a field type of the database in the mobile communication terminal, and updating a database table in the mobile communication terminal according to the determination.
摘要:
An apparatus and method of charging and housing of an unmanned vertical take-off and landing (VTOL) aircraft is disclosed. The apparatus includes an accommodator to accommodate an aircraft, a landing platform on which the aircraft lands, a housing portion to monitor state data by housing or charging the aircraft, and a sensor to assist in landing of the aircraft by allowing the aircraft to communicate with the apparatus. The apparatus enhances operational efficiency by reducing a travel time of the aircraft.
摘要:
Disclosed is a wireless energy transmission structure which includes a disc part including a first conductor plate and a second conductor plate which are spaced to face each other and a dielectric material inserted between the first conductor plate and the second conductor plate, and generating an electric field between the first conductor plate and the second conductor plate; and a ring-shaped wire part one end of which is connected to the first conductor plate and the other end of which is connected to the second conductor plate, and having a meta structure in which a plurality of meta cells is repetitively arranged so as to induce a magnetic field using the electric field, so that the wireless energy transmission structure is reduced in size and is improved in transmission distance and transmission efficiency.