Methods and systems using polarization modulated electromagnetic waves
First Claim
Patent Images
1. A system comprising:
- a radio frequency identification (RFID) reader; and
an RFID tag communicatively coupled to the RFID reader;
wherein the RFID tag comprises a patch antenna comprising a first feed point, a second feed point and a third feed point,wherein the RFID tag is configured to transmit binary data bits to the RFID reader, the RFID reader being responsive to a particular combination of the binary data bits received from the RFID tag,wherein, in the event that the first feed point is active and the second and third feed points are inactive, the binary data bits are encoded in a first electric field polarization of electromagnetic waves transmitted from the RFID tag, a particular magnitude of the first electric field polarization corresponding to a binary zero,wherein, in the event that the second feed point is active and the first and third feed points are inactive, the binary data bits are encoded in a second electric field polarization of electromagnetic waves transmitted from the RFID tag, a particular magnitude of the second electric field polarization corresponding to a binary one,wherein, in the event that the first and second feed points are active and the third feed point is inactive, the binary data bits are encoded in a third electric field polarization of electromagnetic waves transmitted from the RFID tag, a particular magnitude of the third electric field polarization corresponding to a binary zero, andwherein, in the event that the first and third feed points are active and the second feed point is inactive, the binary data bits are encoded in a fourth electric field polarization of electromagnetic waves transmitted from the RFID tag, a particular magnitude of the fourth electric field polarization corresponding to a binary one.
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Abstract
Methods and systems using polarization modulated electromagnetic waves. At least some of the illustrative embodiments are systems comprising a radio frequency identification (RFID) reader, and a RFID tag (the RFID tag communicatively coupled to the RFID reader),. The RFID tag is configured to transmit data to the RFID reader with data encoded in polarization of electromagnetic waves transmitted from the RFID tag.
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Citations
23 Claims
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1. A system comprising:
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a radio frequency identification (RFID) reader; and an RFID tag communicatively coupled to the RFID reader; wherein the RFID tag comprises a patch antenna comprising a first feed point, a second feed point and a third feed point, wherein the RFID tag is configured to transmit binary data bits to the RFID reader, the RFID reader being responsive to a particular combination of the binary data bits received from the RFID tag, wherein, in the event that the first feed point is active and the second and third feed points are inactive, the binary data bits are encoded in a first electric field polarization of electromagnetic waves transmitted from the RFID tag, a particular magnitude of the first electric field polarization corresponding to a binary zero, wherein, in the event that the second feed point is active and the first and third feed points are inactive, the binary data bits are encoded in a second electric field polarization of electromagnetic waves transmitted from the RFID tag, a particular magnitude of the second electric field polarization corresponding to a binary one, wherein, in the event that the first and second feed points are active and the third feed point is inactive, the binary data bits are encoded in a third electric field polarization of electromagnetic waves transmitted from the RFID tag, a particular magnitude of the third electric field polarization corresponding to a binary zero, and wherein, in the event that the first and third feed points are active and the second feed point is inactive, the binary data bits are encoded in a fourth electric field polarization of electromagnetic waves transmitted from the RFID tag, a particular magnitude of the fourth electric field polarization corresponding to a binary one. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radio frequency identification (RFID) tag comprising:
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a tag antenna system configured to transmit electromagnetic waves having a plurality of distinct electric field polarizations, wherein the tag antenna system comprises a patch antenna comprising a first feed point, a second feed point and a third feed point; and an RFID circuit coupled to the tag antenna system; wherein the tag antenna system is configured to transmit binary data bits to an RFID reader, the RFID reader being responsive to a particular combination of the binary data bits received from the RFID tag, wherein, in the event that the first feed point is active and the second and third feed points are inactive, the binary data bits are encoded in a first electric field polarization of electromagnetic waves transmitted from the RFID circuit, a particular magnitude of the first electric field polarization corresponding to a binary one, wherein, in the event that the second feed point is active and the first and third feed points are inactive, the binary data bits are encoded in a second electric field polarization of electromagnetic waves transmitted from the RFID circuit, a particular magnitude of the second electric field polarization corresponding to a binary zero, wherein, in the event that the first and second feed points are active and the third feed point is inactive, the binary data bits are encoded in a third electric field polarization of electromagnetic waves transmitted from the RFID circuit, a particular magnitude of the third electric field polarization corresponding to a binary one, and wherein, in the event that the first and third feed points are active and the second feed point is inactive, the binary data bits are encoded in a fourth electric field polarization of electromagnetic waves transmitted from the RFID circuit, a particular magnitude of the fourth electric field polarization corresponding to a binary zero. - View Dependent Claims (10, 11, 12, 13)
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14. A method comprising:
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sending an interrogating signal from an radio frequency identification (RFID) reader to a RFID tag comprising a patch antenna comprising a first feed point, a second feed point and a third feed point; and receiving a response at the RFID reader from the RFID tag in the form of an electromagnetic wave comprising binary data bits, wherein a polarization of the received electromagnetic wave is dependent on which feed points of the patch antenna are active, the RFID reader being responsive to a particular combination of the binary data bits received from the RFID tag, wherein, in the event that the first feed point is active and the second and third feed points are inactive, the electromagnetic wave has a particular magnitude of a first electric field polarization corresponding to a binary zero, wherein, in the event that the second feed point is active and the first and third feed points are inactive, the electromagnetic wave has a particular magnitude of a second electric field polarization corresponding to a binary one, wherein, in the event that the first and second feed points are active and the third feed point is inactive, the electromagnetic wave has a particular magnitude of a third electric field polarization corresponding to a binary one, and wherein, in the event that the first and third feed points are active and the second feed point is inactive, the electromagnetic wave has a particular magnitude of a fourth electric field polarization corresponding to a binary zero. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A system comprising:
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an antenna system configured to receive electromagnetic waves, wherein the antenna system comprises a patch antenna comprising a first feed point, a second feed point and a third feed point; and a radio frequency identification (RFID) reader coupled to the antenna system, wherein the RFID reader is configured to receive binary data bits in the form of electromagnetic waves using the antenna system, the RFID reader being responsive to a particular combination of the binary data bits received from the antenna system, wherein, in the event that the first feed point is active and the second and third feed points are inactive, the binary data bits are encoded in a first electric field polarization of electromagnetic waves, a particular magnitude of the first electric field polarization corresponding to a binary one, wherein, in the event that the second feed point is active and the first and third feed points are inactive, the binary data bits are encoded in a second electric field polarization of electromagnetic waves, a particular magnitude of the second electric field polarization corresponding to a binary zero, wherein, in the event that the first and second feed points are active and the third feed point is inactive, the data is encoded in a third electric field polarization of electromagnetic waves, a particular magnitude of the third electric field polarization corresponding to a binary zero, and wherein, in the event that the first and third feed points are active and the second feed point is inactive, the data is encoded in a fourth electric field polarization of electromagnetic waves, a particular magnitude of the fourth electric field polarization corresponding to a binary one. - View Dependent Claims (22, 23)
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Specification