Patent application number | Description | Published |
20090015378 | RFID READER CANCELLING LEAKAGE SIGNAL - A radio frequency identification (RFID) recorder for cancelling a leakage signal includes a digital unit calculating and storing an amplitude and a phase of the leakage signal, and a leakage cancellation circuit generating a leakage cancellation signal to cancel the leakage signal in response to a control of the digital unit. | 01-15-2009 |
20090066480 | RFID READER AND RF TRANSMISSION METHOD THEREOF - A Radio Frequency (RF) transmission method of a Radio Frequency Identification (RFID) reader using a plurality of channels is provided. The method includes: selecting at least part of the plurality of channels, measuring an RF power of each of the selected channels, determining a transmission environment of the RF according to a measurement determination, and modulating an RF signal according to the determined transmission environment. | 03-12-2009 |
20090068957 | RFID READER COMPENSATING LEAKAGE SIGNAL AND COMPENSATING METHOD THEREOF - A radio frequency identification (RFID) reader includes a transmitter generating a transmission signal for transmission to a tag, a receiver receiving a response signal from the tag, a leakage compensator compensating a leakage signal leaked from the transmitter to the receiver in response to a leakage control signal, and a control unit performing a leakage test operation by applying a test signal to the transmitter, and calculating and storing a leakage parameter for generating the leakage control signal using a level difference of the test signal and a level difference of a test leakage signal leaked to the receiver. | 03-12-2009 |
20090128191 | ULTRA-LOW-POWER LEVEL SHIFTER, VOLTAGE TRANSFORM CIRCUIT AND RFID TAG INCLUDING THE SAME - A level shifter increase a voltage level of an output signal with relatively lower power consumption by adopting current-starved configuration. The level shifter includes an input unit and a driving unit. The input unit includes a current-starved inverter configured to generate a control signal in response to an input signal and a bias voltage. The input unit is powered by a first power supply voltage. The driving unit generates an output signal in response to the control signal. The output signal has a voltage level higher than the input signal, and the driving unit is powered by a second power supply voltage higher than the first power supply voltage. | 05-21-2009 |
20090167499 | RFID COMMUNICATION METHOD AND APPARATUS - A mobile terminal communicates with a base station to request channel allocation for RFID communication, receives a channel from the base station, and communicates with an RFID tag through the allocated channel. | 07-02-2009 |
20100079254 | METHOD OF UPGRADING AN OPERATION PROGRAM OF A RADIO FREQUENCY IDENTIFICATION SYSTEM - A method of upgrading an operation program in an interrogator of a radio frequency identification (RFID) system including the interrogator and a transponder is provided. The method includes transmitting, from the interrogator to the transponder, a first message requesting an operation program upgrade based on information exchanged between the interrogator and the transponder; receiving, at the interrogator from the transponder, a second message that includes a new-version operation program in response to the first message; and installing, at the interrogator, the new-version operation program to upgrade the operation program in the interrogator. | 04-01-2010 |
20100201492 | RFID communication method and system - In a method of communicating in a radio frequency identification (RFID) system including a RFID reader and a plurality of RFID tags, a plurality of spread spectrum data are stored in the plurality of RFID tags. The plurality of spread spectrum data are transmitted from the plurality of RFID tags to the RFID reader. A plurality of original data respectively corresponding to the plurality of RFID tags are simultaneously extracted from the plurality of spread spectrum data at the RFID reader. | 08-12-2010 |