Radio frequency identification system
First Claim
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1. A radio frequency identification (RFID) system comprising:
- a radio frequency (RF) reader for transmitting a first RF signal having a first frequency; and
an RFID tag configured to receive the first RF signal and, in response thereto, to transmit a second RF signal having a second frequency, wherein the second frequency is between 30 GHz and 300 GHz and the first frequency is less than 30 GHz.
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Abstract
A reader emits a low frequency signal to energize a RFID tag. The RFID tag responds with a high frequency signal. An antenna on the RFID tag functions as a resonant circuit upon receiving the low frequency signal to power up the RFID tag. In one embodiment, the high frequency signal is a millimetre frequency signal.
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Citations
29 Claims
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1. A radio frequency identification (RFID) system comprising:
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a radio frequency (RF) reader for transmitting a first RF signal having a first frequency; and an RFID tag configured to receive the first RF signal and, in response thereto, to transmit a second RF signal having a second frequency, wherein the second frequency is between 30 GHz and 300 GHz and the first frequency is less than 30 GHz. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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transmitting a first radio frequency (RF) signal having a first frequency from a reader; receiving the first RF signal by a radio frequency identification (RFID) tag; and transmitting, in response to said receiving, a second RF signal having a second frequency by the RFID tag, wherein the second frequency is between 30 GHz and 300 GHz and the first frequency is less than 30 GHz. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A radio frequency identification (RFID) tag comprising:
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a processor circuit; and an antenna coupled to the processor circuit, the antenna being configured to function as a resonant circuit in response to a first radio frequency (RF) signal in order to power said processor circuit, wherein the RFI tag is configured to receive the first RF signal and, in response thereto, to transmit a second RF signal having a second frequency, wherein the second frequency is higher than the first frequency. - View Dependent Claims (22, 23, 24)
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25. A system for implementing Digital Rights Management (DRM) comprising:
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a requesting multimedia device having an associated RFID tag and configured to wirelessly transmit a request to receive DRM-protected content; and a multimedia content source including a radio frequency identification (RFID) reader, the content source being configured to, receive the request from the requesting multimedia device, poll the RFID tag of the requesting multimedia device, and receive a response signal from the requesting device based on said poll, wherein the response signal has a frequency of between 57 GHz and 64 GHz, and transmit the DRM-protected content in response to said response signal.
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26. A radio frequency identification (RFID) system comprising:
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a radio frequency (RF) reader for transmitting a first RF signal having a first frequency and a second RF signal having a second frequency that is higher than the first frequency; and an RFID tag configured to be energized by the first RF signal and, in response to receiving the second RF signal, the RFID tag being further configured to transmit a third RF signal at a third frequency which is lower than the second frequency. - View Dependent Claims (27, 28, 29)
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Specification