Radio frequency identification tag and operating method thereof
View Patent ↗The invention provides a radio frequency identification (RFID) tag. The RFID tag includes a receiving module, a judging module, and a jamming module. The judging module includes a first judging unit and a second judging unit. When a jamming function of the RFID tag is activated, the first judging unit judges whether a request signal received by the receiving module contains a reading command. If a judgment result of the judging module is positive, the second judging unit then judges whether an authorization code of the reading command is valid. If either the judgment result of the first judging unit or the second judging unit is negative, the judging module controls the jamming module to generate a radio frequency (RF) jamming signal.
1. A radio frequency identification (RFID) tag, comprising:
a receiving module, for receiving a request signal;
a judging module, comprising:
a first judging unit, coupled to the receiving module, for providing a first judgment result whether the request signal contains a reading command when a jamming function of the RFID tag is activated; and
a second judging unit, coupled to the first judging unit, for providing a second judgment result whether an authorization code of the reading command is valid when the first judgment result of the first judging unit is positive; and
a jamming module, coupled to the judging module;
wherein, the judging module controls the jamming module to generate an RF jamming signal when either the first judgment result of the first judging unit or the second judgment result of the second judging unit is negative.
2. The RFID tag as claimed in claim 1 , wherein the request signal is received from an RFID reader.
3. The RFID tag as claimed in claim 2 , the judging module permits the RFID reader to read the RFID tag when either the jamming function is inactive or the second judgment result of the second judging unit is positive.
4. The RFID tag as claimed in claim 2 , the judging module declines the RFID reader from reading the RFID tag when either the first judgment result of the first judging unit or the second judgment result of the second judging unit is negative.
5. The RFID tag as claimed in claim 1 , further comprising:
a transmitting module, coupled to the jamming module, for transmitting the RF jamming signal within a predetermined range around the RFID tag.
6. The RFID tag as claimed in claim 1 , further comprising:
a memory, coupled to the judging module, and stored with a jamming activating variable associated with the jamming function.
7. A method for operating an RFID tag, comprising steps of:
a) receiving a request signal;
b) judging whether the request signal contains a reading command when a jamming function of the RFID tag is activated;
c) judging whether an authorization code of the reading command is valid when a judgment result of step (b) is positive; and
d) generating an RF jamming signal when either step (b) or step (c) returns negative.
8. The method as claimed in claim 7 , wherein the request signal is received from an RFID reader.
9. The method as claimed in claim 8 , further comprising a step of:
(e) permitting the RFID reader to read the RFID tag when either the jamming function is inactive or when the step (c) returns positive.
10. The method as claimed in claim 8 , further comprising a step of:
(f) declining the RFID reader from reading the RFID tag when the judgment result of step (b) or step (c) is negative.
11. The method as claimed in claim 7 , further comprising a step of:
(g) transmitting the RF jamming signal to within predetermined range around the RFID tag.
12. The method as claimed in claim 7 , wherein the RFID tag comprises a memory stored with a jamming activating variable associated with the jamming function.
13. An RFID tag, comprising:
an antenna, for receiving a request signal;
an RFID response module, coupled to the antenna;
a jamming module; and
a judging module, coupled to the RFID response module and the jamming module, for determining whether to control the jamming module to generate an RF jamming signal according to the request signal, comprising
a first judging unit, providing a first judgment result on whether the request signal contains a reading command when a jamming function of the RFID tag is activated; and
a second judging unit, providing a second judgment result on whether an authorization code of the reading command is valid when the first judgment result of the first judging unit is positive.
14. The RFID tag as claimed in claim 13 , wherein the RFID response module generates a response signal in response to the request signal when the judging module does not control the jamming module to generate the RF jamming signal.
15. The RFID tag as claimed in claim 14 , wherein the request signal is received from an RFID reader.
16. The RFID tag as claimed in claim 13 , wherein the RFID response module generates a response signal in response to the request signal when the second judgment result of the second judging unit is positive.
17. The RFID tag as claimed in claim 13 , wherein the judging module controls the jamming module to generate the RF jamming signal when either the first judgment result of the first judging unit or the second judgment result of the second judging unit is negative.
18. The RFID tag as claimed in claim 13 , wherein the RFID response module comprises:
a memory, stored with a jamming activating variable associated with whether a jamming function of the RFID tag is activated.
19. The RFID tag as claimed in claim 13 , wherein the RFID response module comprises:
a demodulating unit, coupled to the antenna, for demodulating the request signal into a demodulated signal; and
an interpreting unit, couple to the demodulating unit and the judging module, for interpreting the demodulated signal to generate a command signal;
wherein, according to the command signal, the judging module judges whether to control the jamming module to generate the RF jamming signal.