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WO-2026093393-A1 - RFID TAG WITH SPATIAL READABILITY

WO2026093393A1WO 2026093393 A1WO2026093393 A1WO 2026093393A1WO-2026093393-A1

Abstract

An RFID tag with spatial readability comprises an antenna arrangement (100) and a carrier film (200). The antenna arrangement (100) comprises a first loop antenna (110) and a second loop antenna (120). The first loop antenna (110) is arranged on a first side (201) of the carrier film (200). The second loop antenna (120) is arranged on a second side (202) of the carrier film (200) that is opposite to the first side (201). The first and second loop antennas (110, 120) are electrically connected to one another. In a plan view of the first side (201) of the carrier film (200), a turn of the first loop antenna (110) runs in the opposite direction to a turn of the second loop antenna (120).

Inventors

  • KLUGE, MARTIN

Assignees

  • SCHREINER GROUP GMBH & CO. KG

Dates

Publication Date
20260507
Application Date
20251029
Priority Date
20241030

Claims (15)

  1. 1. RFID label with spatial readability, including: - an antenna array (100), - a carrier film (200), - wherein the antenna arrangement (100) comprises a first loop antenna (110) and a second loop antenna (120), - wherein the first loop antenna (110) is arranged on a first side (201) of the carrier film (200) and the second loop antenna (120) is arranged on a second side (202) of the carrier film (200) opposite the first side (201), - wherein the first and second loop antennas (110, 120) are electrically connected to each other, - wherein a turn of the first loop antenna (110) runs in the opposite direction to a turn of the second loop antenna (120) when viewed from the top of the first side (201) of the carrier film (200).
  2. 2. RFID label according to claim 1, wherein the first and second loop antennas (110, 120) are electrically connected serially to each other by means of a through-hole (140) through the carrier film (200).
  3. 3. RFID label according to claim 1 or 2, wherein the second loop antenna (120) is arranged in a perpendicular projection to the first loop antenna (110) when viewed from a top view of the first side (201) of the carrier film (200).
  4. 4. RFID label according to one of claims 1 to 3, wherein sections (111) of the first loop antenna (110) and sections (121) of the second loop antenna (120) overlap in a top view of the first side (201) of the carrier film (200) in perpendicular projection.
  5. 5. RFID label according to one of claims 1 to 4, wherein one of the first and second loop antennas (110, 120) extends in the longitudinal direction of the RFID label over at least a first half of the length of the RFID label. P2024,0788 WO N / 24013P-WO October 29, 2025 - 16 -
  6. 6. RFID label according to claim 5, wherein another of the first and second loop antennas (110, 120) extends in the longitudinal direction of the RFID label over a maximum of a second half of the length of the RFID label adjoining the first half.
  7. 7. RFID label according to one of claims 1 to 6, - wherein the antenna arrangement (100) has a conductor track (130) consisting of a first conductor track section (131) and a second conductor track section (132) connected thereto, - wherein the first conductor track section (131) is arranged on the first side (201) of the carrier film (200), - wherein the second conductor section (132) is arranged on the second side (202) of the carrier film (200).
  8. 8. RFID label according to claim 7, - wherein the winding of the first loop antenna (110) is designed such that the first conductor track section (131) runs clockwise when viewed from above on the first side (201) of the carrier film (200), - wherein the winding of the second loop antenna (120) is designed such that the second conductor section (132) runs counterclockwise when viewed from above on the first side (201) of the carrier film (200).
  9. 9. RFID label according to claim 7 or 8, - wherein the first conductor track section (131) has a first end (131a) and a second end (131b), - wherein the second conductor track section (132) has a first end (132a) and a second end (132b), - wherein the winding of the first loop antenna (110) is designed such that the first conductor section (131) runs spirally on the first side (201) of the carrier film (200) between the first end (131a) and second end (131b) of the first conductor section, - wherein the winding of the second loop antenna (120) is designed such that the second conductor section (132) is on the second side (202) of the carrier film (200) P2024,0788 WO N / 24013P-WO October 29, 2025 - 17 - between the first end (132a) and the second end (132b) of the second conductor section runs in a spiral shape.
  10. 10. RFID label according to one of claims 7 to 9, - wherein the first conductor section (131) is arranged in the form of an angular spiral on the first side (201) of the carrier film (200) between the first and second ends (131a, 131b) of the first conductor section, - wherein the second conductor section (132) is arranged on the second side (202) of the carrier film (200) between the first and second ends (132a, 132b) of the second conductor section in the form of an angular spiral.
  11. 11. RFID label according to one of claims 6 to 10, - wherein the conductor track (130) of the antenna arrangement (100) has a third conductor track section (133), - wherein the third conductor track section (133) is located between the first conductor track section (131) and the second conductor track section (132) and runs through the carrier film (200).
  12. 12. RFID label according to claim 11, comprising: - an RFID chip (300), - wherein the RFID chip (300) is arranged between the first end (131a) of the first conductor section (131) and the second end (132b) of the second conductor section (132).
  13. 13. RFID label according to claim 12, - wherein the conductor track (130) of the antenna arrangement (100) has a fourth conductor track section (134), - wherein the fourth conductor track section (134) is located between the second conductor track section (132) and the RFID chip (300) is arranged and runs through the carrier film (200).
  14. 14. RFID label according to claim 13, - wherein the conductor track (130) of the antenna arrangement (100) has a fifth conductor track section (135) which is arranged on the first side (201) of the carrier film (200), P2024,0788 WO N / 24013P-WO October 29, 2025 - 18 - - wherein the fifth conductor section (135) is arranged between the RFID chip (300) and the fourth conductor section (134).
  15. 15. Labeled container with RFID function, comprising: - an RFID label (10) according to any one of claims 1 to 14, - wherein the RFID label (10) is affixed to a wall (2) of the container (1) such that the first and second loop antennas (110, 120) are at least partially opposite each other on the wall (2) of the container (1). ```

Description

P2024,0788 WO N / 24013P-WO October 29, 2025 - 1 - Description RFID label with spatial readability The invention relates to an RFID label with spatial readability from different spatial directions. Furthermore, the invention relates to a labeled container with RFID functionality that is readable from different spatial directions. Besides their use in warehousing and logistics, RFID tags are increasingly being used in the pharmaceutical sector. To identify medical devices, RFID tags are affixed to medical containers, such as vials, syringes, or injection pens. These RFID tags contain an RFID chip or transponder that stores individual product information about the medication contained within the medical container. The RFID chip is connected to an antenna, enabling wireless or contactless communication between a reader and the RFID chip. To read the data stored in the RFID chip, the reader generates an electromagnetic field that induces a current in a conductor of the antenna. While active RFID chips have their own power source, passive RFID chips do not. Instead, they are powered by the electromagnetic field generated by the reader or by the current induced in the antenna conductor, which is required to output the stored data. In most cases, a simple loop antenna is used for the antenna connected to the RFID chip. Pharmaceutical containers, such as the syringes or injection pens mentioned above, are typically cylindrical. When an RFID label with a simple loop antenna is affixed to such a cylindrical container, the antenna structure either surrounds only a portion of the container or is arranged around its entire circumference along with the label. P2024,0788 WO N / 24013P-WO October 29, 2025 - 2 - If the loop antenna is only arranged around part of the cylindrical object, for example, around an area between 0 and 180 degrees, reliable reading of the RFID chip is only possible if the reader is held against the side of the cylindrical object where the loop antenna is located. If, for example, the loop antenna only extends around half of the cylindrical object, such as only the front, satisfactory readability of the data stored in the RFID tag is generally only possible if the reader is held against the front of the container. If, however, the reader is held closer to the back of the container, readability becomes significantly more difficult or even impossible. On the other hand, if the dimensions or length of the loop antenna are increased so that the antenna's conductor structure covers almost the entire surface of the label, the antenna can indeed be positioned around the entire circumference of the container, depending on the label's size. However, when attempting to read the RFID chip, opposing currents are induced in opposite conductor sections of the antenna, canceling each other out and thus further impairing the RFID chip's readability. Therefore, there is a need to specify a label with optimized readability that, once affixed to a container, particularly a cylindrical object, can be reliably read from any spatial direction. Furthermore, a labeled container with RFID functionality should be specified, where the RFID label can be read from any spatial direction. An RFID label with good spatial readability when a reader approaches from different spatial directions is specified in claim 1. The RFID tag comprises an antenna array and a carrier film. The antenna array includes a first loop antenna and a second loop antenna. The first loop antenna is located on one side of the carrier film. The second loop antenna is located on the opposite side of the carrier film. The first and second loop antennas are electrically connected to each other. P2024,0788 WO N / 24013P-WO October 29, 2025 - 3 - connected. One turn of the first loop antenna runs opposite to one turn of the second loop antenna when viewed from above on the first side of the carrier film. The proposed antenna arrangement is thus designed as a double-loop antenna. The antenna arrangement comprises two loop antennas or coils electrically connected in series, wound in opposite directions or arranged in opposite directions on the substrate film. The two loop antennas are located on opposite sides, in particular a top and bottom, of the substrate film. After the RFID label is attached to the round body of a container, for example on the circumferential surface of a syringe or injection pen, the antenna arrangement consisting of the first and second loop antennas covers a large part of the circumferential surface of the round body. While with single-loop antennas, when attempting to read the RFID tag from different spatial directions, especially when attempting a 360-degree readout, there are spatial locations from which the RFID tag cannot be read because the currents induced in the single coil almost cancel each other out, the problem of current cancellation is circumvented by the proposed approach of an antenna arrangement with two counter-rotating