RFID apparatus
First Claim
1. RFID apparatus with an antenna, the RFID apparatus having a reader mode of operation and a tag emulation mode of operation, comprising:
- a transmitter operative to transmit a first RF signal via the antenna to an external tag device when the apparatus is in the reader mode;
a receiver operative to receive a second RF signal from the external tag device via the antenna; and
a tag emulation generator operative to generate a third RF signal dependent upon characteristics of an incoming fourth RF signal received from an external reader device, and transmit the generated third RF signal using the antenna to the external reader device when the apparatus is in the tag emulation mode, wherein the tag emulation generator includes a phase locked loop having an oscillator and a phase detector, wherein the phase detector is configured to continue to operate when the apparatus is in the reader mode.
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Accused Products
Abstract
RFID apparatus includes transmission means for transmitting an RF signal; reception means for receiving a modulated RF signal; and demodulation means for demodulating a received modulated signal. The apparatus comprises generating means for generating a RF signal dependent on an incoming RF signal, the incoming RF signal being generated by different apparatus, and the apparatus is arranged to transmit the generated RF signal such that the generated RF signal interferes with the incoming RF signal. The RFID apparatus has both the means to respond to an RF reader device, in tag emulation mode, and means to function as an RF reader device, in reader mode.
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Citations
17 Claims
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1. RFID apparatus with an antenna, the RFID apparatus having a reader mode of operation and a tag emulation mode of operation, comprising:
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a transmitter operative to transmit a first RF signal via the antenna to an external tag device when the apparatus is in the reader mode; a receiver operative to receive a second RF signal from the external tag device via the antenna; and a tag emulation generator operative to generate a third RF signal dependent upon characteristics of an incoming fourth RF signal received from an external reader device, and transmit the generated third RF signal using the antenna to the external reader device when the apparatus is in the tag emulation mode, wherein the tag emulation generator includes a phase locked loop having an oscillator and a phase detector, wherein the phase detector is configured to continue to operate when the apparatus is in the reader mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. Radio frequency (RF) apparatus with an antenna, the RF apparatus having a reader mode of operation and a tag emulation mode of operation, comprising:
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a tag emulating circuit operative to respond to an external radio frequency reader apparatus when the apparatus is in the tag emulation mode, wherein the tag emulation generator includes a phase locked loop having an oscillator and a phase detector, wherein the phase detector is configured to continue to operate when the apparatus is in the reader mode; and a reader circuit operative to operate as a radio frequency reader device when the apparatus is in the reader mode, wherein the tag emulating circuit and the reader circuit share the antenna.
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Specification