Methods and systems of changing antenna polarization
First Claim
Patent Images
1. A system comprising:
- an antenna having a first feed point and a second feed point;
an antenna communication circuit configured to selectively tune and de-tune the antenna; and
a switch assembly that selectively couples the antenna communication circuit to the first feed point, and that selectively couples the antenna communication circuit to the second feed point,wherein the antenna transmits an electromagnetic wave having a first polarization when the antenna is selectively tuned and de-tuned is with respect to the first feed point to the exclusion of the second feed point; and
wherein the antenna transmits an electromagnetic wave having a second polarization different than the first polarization when the antenna is selectively tuned and de-tuned is with respect to the second feed point.
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Abstract
Methods and systems of changing antenna polarization. At least some of the illustrative embodiments are systems comprising an antenna having a first feed point and a second feed point, an antenna communication circuit, and a switch assembly that selectively couples the antenna communication circuit to the first feed point, and that selectively couples the antenna communication circuit to the second feed point. The feed point (or group of feed points) is selected, for example, based on polarization of an electromagnetic wave to be radiated from or received by the antenna.
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Citations
21 Claims
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1. A system comprising:
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an antenna having a first feed point and a second feed point; an antenna communication circuit configured to selectively tune and de-tune the antenna; and a switch assembly that selectively couples the antenna communication circuit to the first feed point, and that selectively couples the antenna communication circuit to the second feed point, wherein the antenna transmits an electromagnetic wave having a first polarization when the antenna is selectively tuned and de-tuned is with respect to the first feed point to the exclusion of the second feed point; and wherein the antenna transmits an electromagnetic wave having a second polarization different than the first polarization when the antenna is selectively tuned and de-tuned is with respect to the second feed point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system comprising:
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a reading antenna having a first feed point associated with a first polarization of the reading antenna, and the reading antenna having a second feed point associated with a second polarization of the reading antenna; a radio frequency identification (RFID) reader circuit configured to generate an interrogation signal; and a switch assembly that selectively couples the RFID reader circuit to the first feed point; and
that selectively couples the RFID reader circuit to the second feed point;wherein when the interrogation signal is applied to the reading antenna through the first feed point the reading antenna produces electromagnetic radiation with the first polarization; and wherein when the interrogation signal is applied to the reading antenna through the second feed point the reading antenna produces electromagnetic radiation with the second polarization. - View Dependent Claims (10, 11, 12)
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13. A radio frequency identification (RFID) tag comprising:
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a tag antenna; a RFID circuit configured to generate responsive signal, wherein the responsive signal is responsive to an interrogation of the RFID tag; a switch assembly that selectively couples the RFID circuit to a first feed point of the tag antenna, and that selectively couples the RFID circuit to a second feed point of the tag antenna; wherein the first feed point is associated with a first polarization of the tag antenna, and the second feed point is associated with a second polarization of the tag antenna different than the first polarization; wherein when the responsive signal is applied to the tag antenna by way of the first feed point the tag antenna produces electromagnetic radiation with the first polarization; and wherein when the responsive signal is applied to the tag antenna through the second feed point the tag antenna produces electromagnetic radiation with the second polarization. - View Dependent Claims (14, 15, 16)
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17. A system comprising:
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an antenna having a first feed point and a second feed point; an antenna communication circuit configured to produce an electrical signal proportional to electromagnetic radiation incident upon the antenna; and a switch assembly that selectively couples the antenna communication circuit to the first feed point, and that selectively couples the antenna communication circuit to the second feed point; wherein when the electrical signal is conducted between the first feed point and the antenna communication circuit, the electrical signal is predominantly proportional to electro-magnetic radiation incident on the antenna having a first polarization; and wherein when the electrical signal is conducted between the second feed point and the antenna communication circuit, the electrical signal is predominantly proportional to electro-magnetic radiation incident on the antenna having a second polarization. - View Dependent Claims (18)
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19. A system comprising:
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a reading antenna having a first feed point associated with a first polarization of the reading antenna, and the reading antenna having a second feed point associated with a second polarization of the reading antenna; a radio frequency identification (RFID) reader circuit configured to receive an electrical signal from the reading antenna, wherein the electrical signal is proportional to electromagnetic radiation incident upon the reading antenna; a switch assembly that selectively couples the RFID reader circuit to the first feed point; and
that selectively couples the RFID reader circuit to the second feed point;wherein when the electrical signal is received through the first feed point, the electrical signal is predominantly proportional to electromagnetic radiation incident on the reading antenna having the first polarization; and wherein when the electrical signal is received through the second feed point, the electrical signal is predominantly proportional to electromagnetic radiation incident on the reading antenna having the second polarization.
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20. A radio frequency identification (RFID) tag comprising:
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a tag antenna; a RFID circuit configured to selectively tune and de-tune the tag antenna; a switch assembly that selectively couples the RFID circuit to a first feed point of the tag antenna, and that selectively couples the RFID circuit to a second feed point of the tag antenna; wherein the first feed point is associated with a first polarization of the tag antenna, and the second feed point is associated with a second polarization of the tag antenna different than the first polarization; wherein the tag antenna transmits an electromagnetic wave having the first polarization when the antenna is selectively tuned and de-tuned is with respect to the first feed point to the exclusion of the second feed point; and wherein the tag antenna transmits an electromagnetic wave having the second polarization when the tag antenna is selectively tuned and de-tuned is with respect to the second feed point.
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21. A radio frequency identification (RFID) tag comprising:
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a tag antenna; a RFID circuit configured to receive an interrogating signal from the tag antenna, wherein the interrogating signal is proportional to electromagnetic radiation incident upon the tag antenna; a switch assembly that selectively couples the RFID circuit to a first feed point of the tag antenna, and that selectively couples the RFID circuit to a second feed point of the tag antenna; wherein the first feed point is associated with a first polarization of the tag antenna, and the second feed point is associated with a second polarization of the tag antenna different than the first polarization; wherein when the interrogating signal is received by way of the first feed point, the interrogating signal is predominantly proportional to the electromagnetic radiation incident on the tag antenna having the first polarization; and wherein when the interrogating signal is received by way of the second feed point, the interrogating signal is predominantly proportional to the electromagnetic radiation incident on the tag antenna having the second polarization.
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Specification