Transparent micropatterned RFID antenna and articles incorporating same
First Claim
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 microns;
wherein the first conductive micropattern has a thickness of less than 2 microns; and
wherein the first conductive micropattern is characterized by an open area fraction of at least 80%; and
an integrated circuit configured to transmit and receive signals using the antenna;
wherein the antenna is tailored to yield a maximum distance at which an RFID reader operating at 1 Watt radiated power in a 902-928 MHz frequency hopping mode communicates with the device, the maximum distance being less than 30 centimeters or from 2 to 50 centimeters.
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Accused Products
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.
39 Citations
19 Claims
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1. An RFID device, comprising:
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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 microns; wherein the first conductive micropattern has a thickness of less than 2 microns; and wherein the first conductive micropattern is characterized by an open area fraction of at least 80%; and an integrated circuit configured to transmit and receive signals using the antenna; wherein the antenna is tailored to yield a maximum distance at which an RFID reader operating at 1 Watt radiated power in a 902-928 MHz frequency hopping mode communicates with the device, the maximum distance being less than 30 centimeters or from 2 to 50 centimeters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A card, comprising:
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a card layer; an antenna carried by the card layer; and an integrated circuit configured to transmit and receive signals using the antenna; wherein the antenna comprises a conductive micropattern defining a contiguous mesh conductor, the conductive micropattern forming an antenna responsive to at least a frequency of 915 MHz, the conductive micropattern comprising interconnected traces having a trace width in a range from 0.5 to 20 microns, wherein the first conductive micropattern has a thickness of less than 2 microns; and
the conductive micropattern being characterized by an open area fraction of at least 80%;
wherein the antenna is tailored to yield a maximum distance at which an RFID reader operating at 1 Watt radiated power in a 902-928 MHz frequency hopping mode communicates with the device, the maximum distance being less than 30 centimeters or from 2 to 50 centimeters. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification