Radiofrequency transponder for a tire

Patent metadata

Field	Value
Publication number	US-10339435-B2
Application number	US-201615578531-A
Country	US
Kind code	B2
Filing date	Jun 3, 2016
Priority date	Jun 3, 2015
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A radiofrequency transponder includes a radiating antenna and an electronic device. The radiating antenna is a single-strand helical spring forming a dipole antenna. The electronic device includes an electronic chip and a primary antenna, which are encapsulated at least partially in a rigid, electrically insulating mass. The primary antenna is electromagnetically coupled to the radiating antenna.

First claim

The invention claimed is:

1. A radiofrequency transponder useable in a mass of an elastomer mixture, the radiofrequency transponder comprising:
an electronic chip;
a radiating antenna structured to communicate with a radiofrequency reader, the radiating antenna being a dipole antenna formed of a single-strand, helical spring; and
a primary antenna connected electrically to the electronic chip, the primary antenna being electromagnetically coupled to the radiating antenna,
wherein the primary antenna and the electronic chip are disposed within a cylindrical cavity of the helical spring.

2. The radiofrequency transponder according to claim 1 , wherein the primary antenna is a coil having at least one turn.

3. The radiofrequency transponder according to claim 2 ,
wherein the primary antenna has an axis of symmetry and is circumscribable in a cylinder,
wherein the cylinder has an axis of revolution that is parallel to the axis of symmetry of the primary antenna, and
wherein the cylinder has a diameter that is greater than or equal to a third of an inside diameter of the helical spring of the radiating antenna.

4. The radiofrequency transponder according to claim 2 , wherein a mid-plane of the coil of the primary antenna is substantially superimposed on a mid-plane of the helical spring of the radiating antenna.

5. The radiofrequency transponder according to claim 2 , wherein:
the radiating antenna has a real peripheral surface S facing the primary antenna,
the primary antenna has a real peripheral surface s facing the radiating antenna, and
a ratio of the real peripheral surface S of the radiating antenna to the real peripheral surface s of the primary antenna has a value S/s in a range between 3 and 8.

6. The radiofrequency transponder according to claim 1 , wherein:
the primary antenna has an axis of symmetry,
the radiating antenna has an axis of revolution, and
the axis of symmetry of the primary antenna and the axis of revolution of the radiating antenna are substantially parallel.

7. The radiofrequency transponder according to claim 1 , wherein:
the electronic chip is part of an electronic circuit card that includes terminals,
the primary antenna is connected to the terminals of the electronic circuit card, and
an impedance of the primary antenna is adapted to an impedance of the electronic circuit card.

8. The radiofrequency transponder according to claim 7 , wherein:
the electronic chip is electrically connected to a printed circuit to form the electronic circuit card, and
the printed circuit includes one or more electronic components in addition to the electronic chip, the one or more electronic components being any combination of passive and active electronic components.

9. The radiofrequency transponder according to claim 1 , wherein the electronic chip and at least a part of the primary antenna are embedded in a rigid, electrically insulating mass to form an electronic device of the radiofrequency transponder.

10. The radiofrequency transponder according to claim 9 , wherein:
a part of the primary antenna is not embedded in the rigid, electrically insulating mass, and
the part of the primary antenna that is not embedded in the rigid, electrically insulating mass is covered with an electrically insulating material.

11. The radiofrequency transponder according to claim 9 , wherein the electronic device is located inside the radiating antenna.

12. The radiofrequency transponder according to claim 11 , wherein:
a geometry of the electronic device is inscribable in a cylinder having a diameter that is less than or equal to an inside diameter of the radiating antenna, and
the cylinder has an axis of revolution that is parallel to, or coaxial with, an axis of symmetry of the primary antenna.

13. The radiofrequency transponder according to claim 9 , wherein the electronic device is located outside of the radiating antenna.

14. The radiofrequency transponder according to claim 13 , wherein the electronic device has a cylindrical cavity structured to receive a portion of the radiating antenna therein.

15. The radiofrequency transponder according to claim 14 , wherein a diameter of a circle inscribable in the primary antenna is less than three times an outside diameter of the radiating antenna.

16. The radiofrequency transponder according to claim 1 , wherein the radiofrequency transponder is part of an identification patch that includes the radiofrequency transponder embedded in at least one electrically insulating and flexible elastomer mixture.

17. A method for manufacturing a radiofrequency transponder, the method comprising:
producing a radiating antenna of a radiofrequency transponder using a helical spring having a size adapted to a communication frequency of a radio signal of the radiofrequency transponder;
forming an electronic circuit card using an electronic chip that is electrically connected to a printed circuit;
forming a primary antenna using a conductive wire;
electrically connecting the primary antenna to the electronic circuit card;
forming an electronic part of the radiofrequency transponder by embedding at least a part of the primary antenna and the electronic circuit card in a rigid, electrically insulating mass; and
positioning the electronic part and the radiating antenna by an insertion process such that: an axis of symmetry of the primary antenna and an axis of revolution of the radiating antenna are substantially parallel, and a mid-plane of the primary antenna and a mid-plane of the radiating antenna are substantially superimposed,
wherein the electronic part formed by embedding at least a part of the primary antenna and the electronic circuit card in a rigid, electrically insulating mass is disposed within a cylindrical cavity of the helical spring.

18. The method according to claim 17 , wherein the step of forming the primary antenna includes forming the conductive wire into a coil having at least one turn and an axis of symmetry, the coil being circumscribable in a circle having an axis of revolution that is parallel to the axis of symmetry of the coil and having a diameter that is greater than or equal to a third of an inside diameter of the radiating antenna.

19. The method according to claim 17 , further comprising a step of covering a part of the primary antenna that is not embedded in the rigid, electrically insulating mass with an electrically insulating material.

20. The method according to claim 17 , further comprising a step of matching an impedance of the primary antenna to an impedance of the electronic circuit card.

21. The method according to claim 17 , wherein the step of forming the electronic circuit card includes adding to the printed circuit, which is equipped with the electronic chip, at least one of:
an additional passive electronic component, and
an additional active electronic component.

22. The method according to claim 17 , wherein the rigid, electrically insulating mass is a thermosetting resin.

23. A method for manufacturing an identification patch, the method comprising:
obtaining a radiofrequency transponder that includes: (a) an electronic chip, (b) a radiating antenna structured to communicate with a radiofrequency reader, the radiating antenna being a dipole antenna formed of a single-strand, helical spring, and (c) a primary antenna connected electrically to the electronic chip, the primary antenna being electromagnetically coupled to the radiating antenn

Assignees

• Michelin & Cie

Inventors

• Destraves Julien

Classifications

• B60C23/0452

  Antenna structure, control or arrangement (vehicle tyre mounted antennas H01Q1/2241) · CPC title

• H04B1/24 Primary

  the receiver comprising at least one semiconductor device having three or more electrodes · CPC title

• B60C2019/004

  Tyre sensors other than for detecting tyre pressure · CPC title

• B60C23/0447 Primary

  Wheel or tyre mounted circuits · CPC title

• B29D30/0061

  Accessories, details or auxiliary operations not otherwise provided for · CPC title