EP-4736063-A1 - RADIO FREQUENCY TRANSCEIVER DEVICE

Abstract

The invention relates to a radio frequency transceiver device (1) comprising a non-conductive support (4) and a second antenna (3) made of an electrically conductive material, the second antenna (3) extending longitudinally in non-contiguous turns in or around the support (4) in such a way as to define an inner space of the second antenna (3). An electronic circuit (2), which is formed by a chip (2a) and a first antenna (2b) electrically connected to the chip (2a), is fully incorporated into the support (4) and is located in the inner space of the second antenna (3).

Inventors

• CARTEAUX, Nicolas
• RAID, Idir

Assignees

• PRIMO1D

Dates

Publication Date

20260506

Application Date

20240405

Claims (11)

1. Radiofrequency transmitting-receiving device (1) comprising: a non-conductive support (4); a second antenna (3) made of an electrically conductive material, the second antenna (3) extending longitudinally in non-contiguous turns, helically wound in or around the support (4) to define an internal space of the second antenna (3); an electronic circuit (2) formed of a chip (2a) and a first antenna (2b) electrically connected to the chip (2a), the electronic circuit (2) being entirely incorporated in the support (4) and arranged in the internal space of the second antenna (3).
2. Radiofrequency transceiver device (1) according to the preceding claim, in which the chip (2a) and the first antenna (2b) are encapsulated in an insulating material (2d).
3. Radiofrequency transmitting-receiving device (1) according to one of the preceding claims, in which the support (4) is a textile piece having a thickness, the second antenna (3) being sewn, woven, braided or knitted into the thickness of the textile piece.
4. Radiofrequency transmission-reception device (1) according to one of claims 1 to 2, in which the support (4) is formed from a wire element and the second antenna (3) is wound in non-contiguous turns around the wire element (4).
5. Radiofrequency transmitting-receiving device (1) according to the preceding claim in which the wire element is a sheath.
6. Radiofrequency transceiver device (1) according to claim 4 in which the wire element is an extruded wire.
7. Radiofrequency transmitting-receiving device (1) according to claim 4 in which the wire element is a ribbon wound on itself.
8. Radiofrequency transmission-reception device (1) according to one of claims 1 to 2 in which the support (4) is formed from a ribbon.
9. Radiofrequency transmission-reception device (1) according to the preceding claim, in which the ribbon is formed of two portions assembled or folded over each other, the electronic circuit (2) being arranged between the two ribbon portions.
10. Radiofrequency transceiver device (1) according to one of the preceding claims comprising a protective layer, the protective layer being formed of at least one covered covering thread, a braided or knitted textile sheath and/or a coating material.
11. Electronic label comprising a radiofrequency transmission-reception device (1) according to one of the preceding claims.

Description

Radiofrequency transmitting-receiving device FIELD OF THE INVENTION TECHNOLOGICAL BACKGROUND OF THE INVENTION SUBJECT OF THE INVENTION BRIEF DESCRIPTION OF THE INVENTION The present invention relates to a radiofrequency transmission and reception device, such as an RFID tag. More particularly, the present invention relates to a radiofrequency transmission and reception device that can be flexible, i.e. capable of elastic deformation, and robust. Such a device finds an application in the field of labeling objects, and more particularly objects capable of deformation as is the case, for example, in the textile field or for objects formed from a deformable material such as rubber-based objects. Document WO2022171951 proposes a radiofrequency transceiver device comprising an electronic circuit (for example a transponder) formed by a chip, in particular an identification chip, and a first antenna electrically connected to the chip. This transponder is arranged directly or indirectly on a textile core yarn. A second antenna is arranged in non-contiguous turns around and along the textile core yarn. The first antenna and the second antenna are electromagnetically coupled. This radiofrequency transceiver device has a wire form factor, a deformable character (i.e. it conforms to tensile/bending and/or torsional constraints) and flexible character (i.e. it can bend and unbend) which forms very advantageous characteristics for its integration into certain products, such as textile or rubber-based products in particular. As set out in the aforementioned document, the transponder has millimetric dimensions. When it is directly or indirectly attached to the textile core thread, it forms a protuberance of the radiofrequency transmission-reception device. This protuberance may be inconvenient for handling the device, particularly when this handling is carried out by industrial equipment operating at high speed, for example to integrate the device into an electronic label, or to cover it, for example by wrapping, with a covering thread. It is possible that handling it at high speed could lead to the transponder being torn from the rest of the device or to the equipment becoming blocked. To overcome this problem, it is possible to encapsulate the transponder, the textile core wire and the second antenna forming the radio frequency device in a protective material, for example by covering a covering wire, by any other form of sheathing of the device, by extrusion or coating of the protective material around this device, to make the assembly more robust and reduce the dimensions of the protuberance. However, to obtain a satisfactory result it is necessary to provide a significant thickness of protective material, of the order of magnitude at least of the millimeter dimensions of the transponder. This affects the wire form factor of the radio frequency device, its deformability and its flexibility. Finally, the encapsulation step itself can lead to deterioration of the device. Documents WO2017135331, EP2405054 and EP4063544 propose a variety of radiofrequency transmission-reception devices, implementing a first antenna electrically connected to a transmission-reception chip and a second antenna coupled to the first antenna. An aim of the invention is to propose a radiofrequency transceiver device that remedies, at least in part, these problems. More specifically, an aim of the invention is to propose a radiofrequency transceiver device that is more robust than those of the prior art. More particularly still, an aim of the invention is to propose a radiofrequency transceiver device comprising a transponder that does not form as large a protuberance as in known devices. Advantageously, in certain embodiments, the radiofrequency transceiver device has a wire form factor, deformable and flexible characteristics identical or close to those of the prior art. With a view to achieving one of these aims, the subject of the invention proposes a radiofrequency transmission-reception device comprising: a non-conductive support; a second antenna made of an electrically conductive material, the second antenna extending longitudinally in non-contiguous turns, helically wound in or around the support to define an internal space of the second antenna; an electronic circuit formed by a chip and a first antenna electrically connected to the chip, the electronic circuit being entirely incorporated in the support and arranged in the internal space of the second antenna. According to other advantageous and non-limiting characteristics of the invention, taken alone or in any technically feasible combination: the first antenna has a first axis, the second antenna has a second axis, the first axis and the second axis being parallel to each other; the chip and the first antenna are encapsulated in an insulating material; the support is a textile piece having a thickness, the second antenna being sewn, woven, braided or knitted into the thickness of the t