Transparent micropatterned RFID antenna and articles incorporating same

Patent metadata

Field	Value
Publication number	US-8998099-B2
Application number	US-201113880180-A
Country	US
Kind code	B2
Filing date	Nov 17, 2011
Priority date	Dec 16, 2010
Publication date	Apr 7, 2015
Grant date	Apr 7, 2015

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.

First claim

The invention claimed is:

1. An RFID device, comprising:
an antenna comprising:
an insulating substrate; and
a first conductive micropattern disposed on or in the substrate, the first conductive micropattern defining a contiguous mesh conductor;
wherein the first conductive micropattern forms an antenna responsive to at least a frequency of 915 MHz;
wherein the first conductive micropattern comprises interconnected traces having a trace width in a range from 0.5 to 20 micron…

Assignees

• Frey Matthew H
• Zu Lijun
• Egbert William C
• Banerjee Swagata R
• Sainati Robert A
• 3M Innovative Properties Co

Inventors

• Frey Matthew H
• Zu Lijun
• Egbert William C
• Banerjee Swagata R
• Sainati Robert A

Classifications

• H01Q1/38

  Electricity · mapped topic

• G06K19/07773 Primary

  Physics · mapped topic

• G06K19/07783

  Physics · mapped topic

• H01Q1/2225

  Electricity · mapped topic

• H01Q7/00

  Electricity · mapped topic