The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 06, 2014
Filed:
Oct. 11, 2007
Terrence H. Joyce, Jr., Lakeville, MN (US);
Swagata R. Banerjee, North Oaks, MN (US);
William C. Egbert, Minneapolis, MN (US);
Katherine A. Brown, Lake Elmo, MN (US);
Jaewon Kim, Roseville, MN (US);
William A. Mittelstadt, Woodbury, MN (US);
Robert A. Sainati, Bloomington, MN (US);
Terrence H. Joyce, Jr., Lakeville, MN (US);
Swagata R. Banerjee, North Oaks, MN (US);
William C. Egbert, Minneapolis, MN (US);
Katherine A. Brown, Lake Elmo, MN (US);
Jaewon Kim, Roseville, MN (US);
William A. Mittelstadt, Woodbury, MN (US);
Robert A. Sainati, Bloomington, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
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.