Circuits for RFID tags with multiple non-independently driven RF ports
First Claim
Patent Images
1. A circuit for use in an RFID tag connectible to first and second antennas, comprising:
- a first RF port configured for connection to the first antenna;
a first modulating switch configured to selectively couple and uncouple the first RF port to a first refererence voltage responsive to a modulating signal;
a second RF port configured for connection to the second antenna; and
a second modulating switch configured to selectively couple and uncouple the second RF port to a second reference voltage responsive to the modulating signal.
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Abstract
A circuit for an RFID tag has at least two RF ports for driving points of the antenna that may correspond to different RF polarizations. The RF ports may be driven by a common modulating signal, or by separate modulating signals. Further, the ports may be coupled and uncoupled together, responsive to a control signal. The control signal may be the same as one or both of the modulating signals.
162 Citations
43 Claims
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1. A circuit for use in an RFID tag connectible to first and second antennas, comprising:
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a first RF port configured for connection to the first antenna; a first modulating switch configured to selectively couple and uncouple the first RF port to a first refererence voltage responsive to a modulating signal; a second RF port configured for connection to the second antenna; and a second modulating switch configured to selectively couple and uncouple the second RF port to a second reference voltage responsive to the modulating signal. - View Dependent Claims (3)
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2. A circuit for use in an RFID tag, comprising:
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a first RF port; a first modulating switch configured to selectively couple and uncouple the first RF port to a first reference voltage responsive,to a modulating signal; a second RF port; and a second modulating switch configured to selectively couple and uncouple the second RF port to a second reference voltage responsive to the modulating sigpal, wherein; the RFID tag has an antenna system adapted to receive RF signals of diverse polarizations, the first RF port is adapted to receive an RF signal of a first polarization, and the second RF port is adapted to receive an RF signal of a second polarization.
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4. A circuit for use in an RFID tag, comprising:
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a first RF port; a first modulating switch configured to selectively couple and uncouple the first RF port to a first reference voltage responsive to a modulating signal; a second RF port; a second modulating switch configured to selectively couple and uncouple the second RF port to a second reference voltage responsive to the modulating signal; and a connecting switch configured to selectively couple and uncouple the first RF port and the second RF port responsive to a control signal. - View Dependent Claims (5, 6, 7)
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8. A device for use in an RFID tag having first and second antennas, comprising:
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means for generating a modulating signal in response to a first signal received at a first RF port configured for connection to the fist antenna; means for coupling and uncoupling the first RF port to a first reference voltage responsive to the modulating signal; and means for coupling and uncoupling a second reference voltage to a second RF port responsive to the modulating signal, the second RF port connection for coupling to the second antenna. - View Dependent Claims (9)
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10. A device for use in an RFID tag, comprising:
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means for generating a modulating signal in response to a first signal received at a first RF port; means for coupling and uncoupling the first RF port to a first reference voltage responsive to the modulating signal; means for coupling and uncoupling a second reference voltage to a second RF port responsive to the modulating signal; and means for coupling and uncoupling the first RF port to the second RF port responsive to a control signal.
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11. A device for use in an RFID tag, comprising:
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means for generating a modulating signal in response to a first signal received at a first RF port; means for coupling and uncoupling the first RF port to a first reference voltage responsive to the modulating signal; means for coupling and uncoupling a second reference voltage to a second RF port responsive to the modulating signal; and
means for coupling and uncoupling the first RF port to the second RF port responsive to a control signal, wherein the control signal is the modulating signal.
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12. A device for use in an RFID tag, comprising:
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means for generating a modulating signal in response to a first signal received at a first RF port; means for coupling and uncoupling the first RF port to a first reference voltage responsive to the modulating signal; and means for coupling and uncoupling a second reference voltage to a second RF port responsive to the modulating signal, wherein the means for coupling and uncoupling the first RF port to the second RF port includes a transistor. - View Dependent Claims (13)
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14. A method for using a circuit for an RFID tag, the circuit configured for coupling to first and second antennas, comprising:
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receiving a first signal at a first RF port configured for connection to the first antenna; generating a modulatling signal in response to the first received signal; coupling and uncoupling the first RF port to a first reference voltage responsive to the modulating signal; and coupling and uncoupling a second reference voltage to a second RF port responsive to the modulating signal, the second RF port configured for connection to the second antenna. - View Dependent Claims (15, 16, 17)
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18. A circuit for use in an RFID tag, comprising:
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a first RF port; a second RF port; and a connecting switch configured to selectively couple and uncouple the first RF port to the second RF port responsive to a control signal, wherein the RFID tag has an antenna system adapted to receive RF signals of diverse polarizations, the first RF port is adapted to receive an RF signal of a first polarization, and the second RF port is adapted to receive an RF signal of a second polarization. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A device for use in an RFID tag, comprising,
means for generating a control signal in response to a first signal received at a first RF port; -
means for coupling and uncoupling, responsive to the control signal the first RF port to a second RF port; means for coupling and uncoupling the first RF port to a first reference voltage responsive to a first modulating signal; and means for coupling and uncoupling the second RF port to a second reference voltage responsive to a second modulating signal. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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38. A method for using a circuit for an RFID tag, comprising:
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receiving a first signal at a first RF port; generating a control signal in response to the first received signal; coupling and uncoupling, responsive to the control signal the first RF port to a second RF port coupling and uncoupling the first RF port to a first reference voltage responsive to a first modulating signal; and coupling and uncoupling the second RF port to a second reference voltage responsive to a second modulalting signal. - View Dependent Claims (39, 40, 41, 42, 43)
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Specification