RFID TAG WITH A MODIFIED DIPOLE ANTENNA
First Claim
1. A dipole antenna for a radio frequency identification (RFID) tag comprising:
- a straight dipole segment formed from a first electrically conductive trace; and
a loop segment formed from a second electrically conductive trace and electrically coupled to the straight dipole segment, wherein a width of the dipole antenna is less than or equal to four times a width of a smaller one of the first and second conductive traces.
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Accused Products
Abstract
In general, the disclosure describes an RFID tag designed such that the tag is both covert and not easily blocked from the interrogation signal by the hand or other body part of a person. In particular, the RFID tag is designed to have a long, narrow aspect that allows placement of the tag in locations on or in a book that are inconspicuous to the casual observer while extending beyond a hand of a person holding the book by the spine on or near a geometry centerline. The RFID tag includes a dipole segment and a loop segment coupled to the dipole segment. The loop segment of the modified dipole antenna provides the antenna with larger signal strength than conventional dipole antennas. Moreover, the conductive loop segment also provides improved impedance matching capabilities to allow the modified dipole antenna to match the impedance of an integrated circuit (IC) chip of the RFID tag.
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Citations
25 Claims
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1. A dipole antenna for a radio frequency identification (RFID) tag comprising:
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a straight dipole segment formed from a first electrically conductive trace; and a loop segment formed from a second electrically conductive trace and electrically coupled to the straight dipole segment, wherein a width of the dipole antenna is less than or equal to four times a width of a smaller one of the first and second conductive traces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio frequency identification (RFID) tag comprising:
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a modified dipole antenna that includes; a straight dipole segment formed from a first electrically conductive trace; and a loop segment formed from a second electrically conductive trace and electrically coupled to the straight segment, wherein a width of the modified dipole antenna is less than approximately 6 millimeters (mm) and a length of the modified dipole antenna is greater than approximately 100 mm; and an integrated circuit electrically coupled to the modified dipole antenna. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification