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 generate control information based on strength of the received wireless signal, and send the control information to the first device;
wherein the second device sends the 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 adjusts transmission power of the wireless signal based on the digital value contained within the control information.
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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
20 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 generate control information based on strength of the received wireless signal, and send the control information to the first device; wherein the second device sends the 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 adjusts transmission power of the wireless signal based on the digital value contained within the control information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A radio frequency communication system comprising:
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a power receiver configured to transmit a wireless signal; and a power transmitter configured to receive the wireless signal and generate control information based on strength of the received wireless signal, and send the control information to the power receiver, wherein the power receiver is supplied with power from a signal transmitted from the power transmitter, wherein the power transmitter generates control information based on strength of the received wireless signal and sends the control information to the power receiver, and the power receiver controls transmission power of the wireless signal based on the received control information. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification