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;
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.
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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
41 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; 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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transmitting an electromagnetic wave with a first polarization by applying a time-varying electrical signal to a first feed point of an antenna; and transmitting an electromagnetic wave with a second polarization different from the first polarization, the transmitting the second electromagnetic wave by applying a time-varying electrical signal to a second feed point of the antenna and not the first feed point. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. 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; 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. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A radio frequency identification (RFID) tag comprising:
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a tag antenna; a RFID circuit; a switch assembly that selectively couples the RFID circuit to a first feed point of the tag antenna, and than 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. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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35. A system comprising:
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an antenna having a feed point, a first ground point and a second ground point; an antenna communication circuit coupled to the feed point; a switch assembly that selectively couples the first point to a ground, and that selectively couples the second ground point to the ground. - View Dependent Claims (36, 37, 38)
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39. A method comprising:
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applying a time varying electrical signal to a feed point of an antenna; transmitting from the antenna an electromagnetic wave with a first polarization by coupling a first ground point of the antenna to ground; and transmitting from the antenna an electromagnetic wave with a second polarization different from the first polarization, the transmitting the second electromagnetic wave by coupling a second ground point of the antenna to ground. - View Dependent Claims (40, 41)
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Specification