Radio frequency identification (RFID) tag including a three-dimensional loop antenna
First Claim
1. A radio frequency identification (RFID) tag comprising:
- a loop antenna that includes;
a first conductive portion having a length and width that substantially exceed a thickness of the first conductive portion, wherein the length and width of the first conductive portion substantially lie in a first plane; and
a second conductive portion having a length and width that substantially exceed a thickness of the second conductive portion, wherein the length and width of the second conductive portion substantially lie in a second plane that is substantially parallel to the first plane, the second conductive portion being electrically coupled to the first conductive portion and configured to couple to a conductive surface of an article to which the RFID tag is attached; and
an RFID circuit electrically connected to the loop antenna, wherein a current is excited through the loop antenna to flow through the first conductive portion, the second conductive portion, and the conductive surface of the article to which the RFID tag is attached in a current loop that lies in a third plane that is substantially perpendicular to the first plane and the second plane.
1 Assignment
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Accused Products
Abstract
This disclosure describes a radio frequency identification (RFID) tag that includes a three-dimensional (3D) loop antenna. The 3D loop antenna includes a first conductive portion having a length and width that substantially exceed a thickness. The length and width of the first conductive portion substantially lie in a first plane. The 3D loop antenna includes a second conductive portion having a length and width that substantially exceed a thickness. The length and width of the second conductive portion substantially lie in a second plane that is substantially parallel to the first plane. An RFID circuit electrically connected to the loop antenna excites a current through the first and second conductive portions in a current loop that lies in a third plane that is not substantially parallel to the first and second planes. In some instances the third plane may be substantially perpendicular to the first and second planes.
54 Citations
38 Claims
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1. A radio frequency identification (RFID) tag comprising:
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a loop antenna that includes; a first conductive portion having a length and width that substantially exceed a thickness of the first conductive portion, wherein the length and width of the first conductive portion substantially lie in a first plane; and a second conductive portion having a length and width that substantially exceed a thickness of the second conductive portion, wherein the length and width of the second conductive portion substantially lie in a second plane that is substantially parallel to the first plane, the second conductive portion being electrically coupled to the first conductive portion and configured to couple to a conductive surface of an article to which the RFID tag is attached; and an RFID circuit electrically connected to the loop antenna, wherein a current is excited through the loop antenna to flow through the first conductive portion, the second conductive portion, and the conductive surface of the article to which the RFID tag is attached in a current loop that lies in a third plane that is substantially perpendicular to the first plane and the second plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A radio frequency identification (RFID) system comprising:
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a reader unit configured to output an interrogating radio frequency (RF) field; and an RFID tag comprising; a loop antenna that includes; a first conductive portion having a length and width that substantially exceed a thickness of the first conductive portion, wherein the length and width of the first conductive portion substantially lie in a first plane; and a second conductive portion having a length and width that substantially exceed a thickness of the second conductive portion, wherein the length and width of the second conductive portion substantially lie in a second plane that is substantially parallel to the first plane, the second conductive portion being electrically coupled to the first conductive portion and configured to couple to a conductive surface of an article to which the RFID tag is attached; and an RFID circuit electrically connected to the loop antenna, wherein a current is excited through the first conductive portion, the second conductive portion and the conductive surface of the article to which the RFID tag is attached in a current loop that lies in a third plane that is substantially perpendicular to the first plane and the second plane to output an RF signal in response to the interrogating RF signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An article comprising:
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an electrically conductive surface; and an radio frequency identification (RFID) tag coupled to the electrically conductive surface of the article, the RFID tag comprising; a loop antenna comprising; a first conductive portion having a length and width that substantially exceed a thickness of the first conductive portion, wherein the length and width of the first conductive portion substantially lie in a first plane; and a second conductive portion having a length and width that substantially exceed a thickness of the second conductive portion, wherein the length and width of the second conductive portion substantially lie in a second plane that is substantially parallel to the first plane, the second conductive portion being electrically coupled to the first conductive portion and configured to couple to a conductive surface of an article to which the RFID tag is attached; and an RFID circuit electrically connected to the loop antenna, wherein a current is excited through the loop antenna to flow through the first conductive portion, the second conductive portion and the conductive surface of the article to which the RFID tag is attached in a current loop that lies in a third plane that is not substantially parallel to the electrically conductive surface of the article. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38)
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Specification