RFID verifier
First Claim
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1. 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;
a transmit signal strength indicator operable to measure the interrogating signal power;
a received signal strength indicator operable to measure the signal power from the interrogated RFID tag; and
a processor operable to compare the measured interrogating signal power and RFID tag signal power to obtain a measure of quality for the interrogated RFID tag.
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Abstract
An RFID verifier includes a transmit signal strength indicator (TSSI) and a receive signal strength indicator (RSSI). Using the TSSI, the RFID verifier may determine the amount of power an interrogated RFID tag is illuminated with. Similarly, using the RSSI, the RFID verifier may determine the amount of power returned to the RFID verifier by the RFID tag. By comparing the returned power to the amount used to illuminate the interrogated tag, the RFID verifier may provide an indicia of quality for the interrogated RFID tag.
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Citations
21 Claims
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1. An RFID verifier, comprising:
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a transceiver operable to interrogate with an interrogating signal an RFID tag and to receive a resulting backscattered signal from the interrogated RFID tag;
a transmit signal strength indicator operable to measure the interrogating signal power;
a received signal strength indicator operable to measure the signal power from the interrogated RFID tag; and
a processor operable to compare the measured interrogating signal power and RFID tag signal power to obtain a measure of quality for the interrogated RFID tag. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An RFID tag verification method, comprising:
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interrogating the RFID tag with an interrogating RF signal;
measuring the power of the interrogating RF signal;
receiving a modulated RF signal from the interrogated RFID tag;
measuring the power of the received modulated RF signal; and
comparing the measured powers to provide a measure of quality for the interrogated RFID tag. - View Dependent Claims (15, 16, 17)
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18. An RFID verifier, comprising:
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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; and
means for comparing the measured interrogating signal power and RFID tag signal power to obtain a measure of quality for the interrogated RFID tag. - View Dependent Claims (19, 20, 21)
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Specification