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:
Apr. 07, 2015
Filed:
Nov. 17, 2011
Matthew H. Frey, Cottage Grove, MN (US);
Lijun Zu, Woodbury, MN (US);
William C. Egbert, Minneapolis, MN (US);
Swagata R. Banerjee, North Oaks, MN (US);
Robert A. Sainati, Bloomington, MN (US);
Matthew H. Frey, Cottage Grove, MN (US);
Lijun Zu, Woodbury, MN (US);
William C. Egbert, Minneapolis, MN (US);
Swagata R. Banerjee, North Oaks, MN (US);
Robert A. Sainati, Bloomington, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
Antennas suitable for use in RFID devices include an insulating substrate and a first conductive micropattern disposed on or in the substrate, the first conductive micropattern defining a contiguous mesh conductor. The first conductive micropattern forms an antenna responsive to at least a frequency of 915 MHz, and includes interconnected traces having a trace width in a range from 0.5 to 20 microns. Furthermore, the first conductive micropattern is characterized by an open area fraction of at least 80% or 90%. RFID devices include such an antenna and an integrated circuit configured to transmit and receive signals using the antenna. Cards, such as financial transaction cards or identification cards, include such an antenna carried by a card layer.