Wireless antenna for RFID tires

• US 20110198402A1
• Filed: 01/04/2011
• Published: 08/18/2011
• Est. Priority Date: 02/12/2010
• Status: Active Grant

• Current Assignee: Goodyear Tire & Rubber Company
• Original Assignee: Cooper Tire & Rubber Company (Goodyear Tire & Rubber Company)
• Inventors: Tucker, Randall L.
• Granted Patent: US 9,385,420 B2
• Time in Patent Office: Days
• US Class Current: 235/492
• CPC Class Codes: B60C 23/0452 Antenna structure, control or arrangement vehicle tyre mounted antennas H01Q1/2241
• CPC Class Codes: B60C 23/0493 for attachment on the tyre
• CPC Class Codes: G06K 19/02 characterised by the selection of materials, e.g. to avoid wear during transport through the machine
• CPC Class Codes: G06K 19/041 Constructional details G06K19/06 takes precedence
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G06K 19/07764 the adhering arrangement making the record carrier attachable to a tire tire temperature or pressur control arrangements, see B60C23/00
• CPC Class Codes: H01Q 1/2241 used in or for vehicle tyres
• CPC Class Codes: H01Q 1/3233 particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

An RFID device for tires utilizes a wireless antenna. The antenna is formed of a pair of spaced apart electrically conductive rubber units. The conductive rubber antenna is encapsulated between a pair of non-conductive sheets. A third non-conductive member encircles the conductive rubber antenna and is itself sealed between the first and second sheets of non-conductive material. A microchip is positioned in the slot defined by the space between the units and conductively attached to each of the units.

Claims

1. An RFID device comprising:

(a) a first sheet of non-conductive material having an outwardly facing peripheral edge;

(b) an antenna member having a first antenna unit of conductive rubber engaged to said first sheet and a second antenna unit of conductive rubber engaged to said first sheet in spaced relationship with said first antenna member, the space between said first antenna unit and said second antenna unit defining a slot, said first antenna unit having an upper edge, a lower edge and an end edge, each of said edges spaced from the peripheral edge of said first sheet and said second antenna unit having an upper edge, a lower edge and an end edge, each of said edges being spaced from the peripheral edge of said first sheet;

(c) a microchip positioned in said slot and conductively engaged to said first antenna unit and to said second antenna unit;

(d) a non-conductive member encircling said antenna member and engaging the outwardly facing upper, lower and end edges of each said antenna unit, said non-conductive member having an internal extension positioned in said slot; and

(e) a second sheet of non-conductive material engaged to (i) said antenna and (ii) said encircling non-conductive member.

2. The RFID device according to claim 1 wherein said antenna has an electrical resistance in the range of 20 ohms to 400 ohms.

3. The RFID device according to claim 1 wherein said antenna has an electrical resistance in the range of 40 ohms to 100 ohms.

4. The RFID device according to claim 1 wherein each of said antenna and said encircling non-conductive member has a thickness in the range of 0.05 mm to 3 mm.

5. The RFID device according to claim 1 wherein said first and second sheets are adhered to said antenna by said antenna or said first and second sheets being green rubber.

6. The RFID device according to claim 1 where said first antenna unit is substantially the same size as said second antenna unit.

7. The RFID device according to claim 1 wherein said microchip is positioned substantially midway between said upper edge and said lower edge.

8. A tire having implanted therein or fastened on a surface thereof the RFID device of claim 1.

9. A method for forming an RFID device comprising the steps of:

(a) providing a pair of electrically conductive rubber sheet units each having an upper edge, a lower edge and an end edge;

(b) positioning said electrically conductive rubber sheet units in side-by-side spaced-apart relationship defining a slot therebetween;

(c) encircling said upper edges;

lower edges and end edges with non-conductive material;

(d) positioning a microchip in said slot;

(e) electronically connecting said microchip to each of said pair of electrically conductive sheet units; and

(f) fastening non-conductive material to opposite sides of said pair of electrically conductive sheet units and to said encircling non-conductive material.

10. The method according to claim 9 wherein said electrically conductive rubber is in the green state throughout steps (a) through (f) and further including the step of vulcanizing the assembly formed by steps (a) through (f).

11. The method according to claim 9 further including the step of positioning non-conductive material in those portions of said slot not occupied by said microchip.

12. The method according to claim 9 further including the step of tuning said antenna by varying the size of said electrically conductive sheet units.

13. The method according to claim 9 wherein said electrically conductive rubber is in the green state throughout steps (a) through (f) and further including the step of engaging said RFID device with said electrically conductive rubber in the green state to a partially manufactured tire having components of rubber in the green state and thereafter vulcanizing said tire and said RFID device.

14. A method for forming an RFID device comprising the steps of:

(a) providing an antenna of electrically conductive rubber having first and second sheet units;

each of said units having an upper edge and a lower edge, and having a thickness in the range of 0.05 mm to 3 mm;

(b) positioning said sheet units in spaced apart relationship, the space between said units defining a slot extending between said upper edges and said lower edges;

(c) encircling said sheet units with non-conductive material having the same thickness as said units;

(d) positioning a microchip in said slot;

(e) electrically connecting said microchip to each of said units on opposite sides of said slot; and

(f) fastening non-conductive material having a thickness in the range of 0.05 mm to 3 mm to opposite sides of said antenna and to said encircling non-conductive material.

15. The method according to claim 14 wherein said electrically conductive rubber is in the green state throughout steps (a) through (f) and further including the step of vulcanizing the assembly formed by steps (a) through (f).

16. The method according to claim 14 further including the step of positioning non-conductive material in those portions of said slot not occupied by said microchip.

17. The method according to claim 14 wherein said antenna has an electrical resistance in the range of 20 ohms to 400 ohms.

18. The method according to claim 14 further including the step of tuning said antenna by varying the size of said units.

19. The method according to claim 14 wherein said electrically conductive rubber is in the green state throughout steps (a) through (f) and further including the step of engaging said RFID device with the electrically conductive rubber of said antenna being in the green state to a partially manufactured tire having components of rubber in the green state and thereafter vulcanizing said tire and said RFID device.