Ultra high frequency radio frequency identification tag
First Claim
Patent Images
1. A radio frequency identification (“
- RFID”
) tag, comprising;
a) a dielectric substrate;
b) an antenna attached to the dielectric substrate, wherein the antenna comprises;
i) a first antenna element, wherein the first antenna element comprises a first conductor and a second conductor, wherein each conductor has a first end and a second end opposite the first end; and
ii) a second antenna element, wherein the second antenna element comprises a first portion and a second portion in the shape of closed loops, wherein the first portion is attached to the second end of the first conductor and the second portion is attached to the second end of the second conductor; and
c) an integrated circuit attached to the first end of the first conductor and the first end of the second conductor.
1 Assignment
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Accused Products
Abstract
An antenna design for radio frequency identification (“RFID”) tags. More particularly, the present invention relates to design for RFID tags particularly operating in the ultra high frequency (“UHF”) operating band.
164 Citations
25 Claims
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1. A radio frequency identification (“
- RFID”
) tag, comprising;a) a dielectric substrate; b) an antenna attached to the dielectric substrate, wherein the antenna comprises; i) a first antenna element, wherein the first antenna element comprises a first conductor and a second conductor, wherein each conductor has a first end and a second end opposite the first end; and ii) a second antenna element, wherein the second antenna element comprises a first portion and a second portion in the shape of closed loops, wherein the first portion is attached to the second end of the first conductor and the second portion is attached to the second end of the second conductor; and c) an integrated circuit attached to the first end of the first conductor and the first end of the second conductor. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
- RFID”
-
2. A radio frequency identification (“
- RFID”
) tag, comprising;a) a dielectric substrate; b) an antenna attached to the dielectric substrate, wherein the antenna comprises; i) a first antenna element, wherein the first antenna element comprises a first conductor and a second conductor, wherein each conductor has a first end and a second end opposite the first end; and ii) a second antenna element, wherein the second antenna element comprises a first portion and a second portion, wherein the first portion is attached to the second end of the first conductor and the second portion is attached to the second end of the second conductor; and c) an integrated circuit attached to the first end of the first conductor and the first end of the second conductor, wherein the integrated circuit has a first impedance value, and wherein the antenna has a second impedance value, and wherein the magnitude of the real component of the second impedance value is substantially similar to the magnitude of the real component of the first impedance value, and the magnitude of the imaginary component of the second impedance value is substantially similar to the magnitude of the imaginary component of the first impedance value, and wherein the phase of the imaginary component of the first impedance value and the phase of the imaginary component of the second impedance value are opposite. - View Dependent Claims (3, 4, 5)
- RFID”
-
15. A radio frequency identification (“
- RFID”
) tag, comprising;a) a dielectric substrate; b) an antenna attached to the dielectric substrate, wherein the antenna comprises; i) a first antenna element, wherein the first antenna element comprises a first conductor and a second conductor, wherein each conductor has a first end and a second end opposite the first end; and ii) a second antenna element, wherein the second antenna element comprises a first portion and a second portion, wherein the first portion is attached to the second end of the first conductor and the second portion is attached to the second end of the second conductor; and c) an integrated circuit attached to the first end of the first conductor and the first end of the second conductor, wherein the first portion of the second antenna element and the second portion of the second antenna element are in the shape of polygons.
- RFID”
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16. A radio frequency identification (“
- RFID”
) tag, comprising;a) a dielectric substrate; b) an antenna attached to the dielectric substrate, wherein the antenna comprises; i) a first antenna element, wherein the first antenna element comprises a first conductor and a second conductor, wherein each conductor has a first end and a second end opposite the first end; and ii) a second antenna element, wherein the second antenna element comprises a first portion and a second portion, wherein the first portion is attached to the second end of the first conductor and the second portion is attached to the second end of the second conductor; and c) an integrated circuit attached to the first end of the first conductor and the first end of the second conductor, wherein the first portion of the second antenna element is dissimilar in shape to the second portion of the second antenna element.
- RFID”
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17. A method of manufacturing an ultra high frequency (“
- UHF”
) radio frequency identification (“
RFID”
) tag, comprising the steps of;a) providing a dielectric substrate; b) selecting an antenna comprised of a first antenna element and a second antenna element, wherein the first antenna element is selected to provide a desired operating frequency range of the antenna, wherein the second antenna element is selected to provide a desired impedance value, wherein the first antenna element comprises a first conductor and a second conductor, wherein each conductor has a first end and a second end opposite the first end, and wherein the second antenna element comprises a first portion and a second portion in the shape of closed loops; and c) attaching the antenna to the dielectric substrate such that the first portion of the second antenna element is attached to the second end of the first conductor and the second portion of the second antenna element is attached to the second end of the second conductor; and d) attaching an integrated circuit to the first end of the first conductor and the first end of the second conductor. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
- UHF”
Specification