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US 7,479,883 B2Granted
RFID verifier
AssigneePrintronix, Inc.
InventorLihu M. Chiu
Life of this patent
Estimating the term…
Abstract
An RFID verifier is configured to vary a slope for a ramp-modulated interrogating signal to determine the slope at which an interrogated RFID tag no longer responds to the interrogating signal. In this fashion, the RFID verifier may obtain a measure of quality for the interrogated RFID tag with respect to the tag's ability to decode ramp-modulated signals.
Claims20
An RFID verifier, comprising:
- a transceiver operable to interrogate with an interrogating signal an RFID tag and to receive a resulting backscattered signal from the interrogated RFID tag;
- and
- a processor operable to vary a slope of a ramp modulation for the interrogating signal to obtain a first measure of quality for the interrogated RFID tag.
An RFID tag verification method, comprising:
- interrogating an RFID tag with an interrogating RF signal;
- ramp-modulating the interrogating RF signal;
- and
- varying a slope for the ramp modulation to determine a first measure of quality for the RFID tag.
1 more element
An RFID verifier, comprising:
- a transceiver operable to interrogate with an interrogating signal an RFID tag and to receive a resulting backscattered signal from the interrogated RFID tag;
- means for measuring the interrogating signal power;
- means for measuring the signal power from the interrogated RFID tag;
- means for comparing the measured interrogating signal power and RFID tag signal power to obtain a first measure of quality for the interrogated RFID tag;
- and
- means for varying a ramp modulation for the interrogating signal power to obtain a second measure of quality of the interrogated RFID tag.
3 more elements
Dependencies are inferred from the claim text.