RFID SYSTEM AND COMMUNICATION METHOD PERFORMED BY THE SAME
First Claim
1. A radio frequency communication system comprising:
- a first device configured to transmit a wireless signal; and
a second device configured to receive the wireless signal and send information to the first device by modulating the received wireless signal;
wherein the second device sends control information including a digital value to the first device, andthe first device, if the control information sent from the second device is received, extracts the digital value from the control information, and controls the transmission of the wireless signal according to the digital value contained within the control information.
1 Assignment
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Accused Products
Abstract
Provided is an RFID system and method for maintaining a constant strength of a signal transmitted from an RFID tag to an RFID reader, regardless of a distance between the reader and tag. The RFID signal strength measuring reader measures a signal strength received from the RFID tag, creates control information used to set an amplification amount of the RFID tag by using a value of the measured strength to include the control information in an output signal, and sends the output signal to the RFID tag. The RFID tag, if the signal sent from the RFID reader is received, extracts internal information from the received signal, sends the information to the RFID reader as an output signal, and extracts the control information included in the signal sent from the RFID reader to adjust a strength of the output signal according to a value of the control information.
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Citations
14 Claims
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1. A radio frequency communication system comprising:
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a first device configured to transmit a wireless signal; and a second device configured to receive the wireless signal and send information to the first device by modulating the received wireless signal; wherein the second device sends control information including a digital value to the first device, and the first device, if the control information sent from the second device is received, extracts the digital value from the control information, and controls the transmission of the wireless signal according to the digital value contained within the control information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification