RFID tag

Patent metadata

Field	Value
Publication number	US-12321803-B2
Application number	US-202017756007-A
Country	US
Kind code	B2
Filing date	Nov 11, 2020
Priority date	Nov 19, 2019
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

A radio frequency identification (RFID) tag includes an inlay; a magnetic sheet laminated on an attachment object side of the inlay; and a spacer layer disposed between the magnetic sheet and the attachment object. The inlay includes an IC chip configured to store identification information, a loop conductor connected to the IC chip, and an antenna unit connected to the loop conductor.

First claim

The invention claimed is:

1. A radio frequency identification (RFID) tag for attachment to an attachment object, the RFID tag comprising:
an inlay, the inlay including an IC chip configured to store identification information, a loop conductor connected to the IC chip, and an antenna unit connected to the loop conductor;
a magnetic sheet laminated on an attachment object side of the inlay; and
a spacer layer disposed between the magnetic sheet and the attachment object, wherein the spacer layer is formed of a material that is deformable together with the inlay and the magnetic sheet in response to an external force,
wherein the spacer layer comprises an insulating layer made of a material selected from woven fabric, non-woven fabric, or inorganic materials.

2. The RFID tag according to claim 1 , wherein the attachment object is metal.

3. The RFID tag according to claim 1 , wherein the antenna unit includes a linear element, the linear element including two linear-shaped conductors extending away from each other from the loop conductor, and each having a given electrical length that is a multiple of approximately ¼ of a wavelength of a frequency used.

4. The RFID tag according to claim 1 , wherein the antenna unit includes a primary element and a secondary element, the primary element including conductors connected to the loop conductor and extending away from each other from the loop conductor, and the secondary element including conductors each connected to the primary element so as to branch from an intermediate portion of the primary element and extending in parallel to the primary element, and
wherein one of the primary element and the secondary element has a given electrical length that is a multiple of approximately ¼ of a wavelength of a frequency used, and the other of the primary element and the secondary element has an electrical length that is different from the given electrical length.

5. The RFID tag according to claim 1 , wherein the antenna unit includes a primary element and a secondary element, the primary element including conductors connected to the loop conductor and extending away from each other from the loop conductor, and the secondary element including conductors each having a meandering shape and connected to the loop conductor, and
wherein one of the primary element and the secondary element has a given electrical length that is a multiple of approximately ¼ of a wavelength of a frequency used, and the other of the primary element and the secondary element has an electrical length that is different from the given electrical length.

6. The RFID tag according to claim 1 , wherein the antenna unit includes grid-shaped conductors connected to the loop conductor, extending away from each other from the loop conductor, and each having an electrical length that is a multiple of approximately ¼ of a wavelength of a frequency used.

7. The RFID tag according to claim 3 , wherein the antenna unit includes a branch element, the branch element being a conductor connected to the linear element so as to branch from an intermediate portion of the linear element, and extending in parallel to the linear element, and
the branch element has an electrical length that is different from the given electrical length.

8. The RFID tag according to claim 3 , wherein the antenna unit includes a hook element, the hook element being a hook-shaped conductor disposed at a tip of the linear element and extending in a direction different from an extending direction of the linear element, and
the hook element has an electrical length that is different from the given electrical length.

9. The RFID tag according to claim 7 , wherein the antenna unit includes a grid element that is a conductor extending from the linear element to the branch element, and
the grid element, the linear element, and the branch element together form a grid pattern.

10. The RFID tag according to claim 8 , wherein the antenna unit includes a grid element that is a conductor extending from the linear element to the hook element, and
the grid element, the linear element, and the hook element together form a grid pattern.

11. The RFID tag according to claim 1 , wherein the frequency used is a frequency in an ultra high frequency (UHF) band.

12. The RFID tag according to claim 1 , wherein the RFID tag is a wireless tag of a radio wave type.

13. A radio frequency identification (RFID) tag for attachment to an attachment object, the RFID tag comprising:
an inlay, the inlay including an IC chip configured to store identification information, a loop conductor connected to the IC chip, and an antenna unit connected to the loop conductor;
a magnetic sheet laminated on an attachment object side of the inlay; and
a spacer layer disposed between the magnetic sheet and the attachment object,
wherein the antenna unit includes:
a linear element, the linear element including two linear-shaped conductors extending away from each other from the loop conductor and each having a given electrical length that is a multiple of approximately ¼ of a wavelength of a frequency used; and
at least one item selected from a group consisting of:
a branch element, the branch element being a conductor connected to the linear element so as to branch from an intermediate portion of the linear element, and extending in parallel to the linear element, the branch element having an electrical length that is different from the given electrical length; and
a hook element, the hook element being a hook-shaped conductor disposed at a tip of the linear element and extending in a direction different from an extending direction of the linear element, the hook element having an electrical length that is different from the given electrical length.

14. A radio frequency identification (RFID) tag for attachment to an attachment object, the RFID tag comprising:
an inlay, the inlay including an IC chip configured to store identification information, a loop conductor connected to the IC chip, and an antenna unit connected to the loop conductor;
a magnetic sheet laminated on an attachment object side of the inlay; and
a spacer layer disposed between the magnetic sheet and the attachment object, wherein the antenna unit includes a primary element and a secondary element, the primary element including conductors connected to the loop conductor and extending away from each other from the loop conductor, and the secondary element including conductors each connected to the primary element so as to branch from an intermediate portion of the primary element and extending in parallel to the primary element, and
wherein one of the primary element and the secondary element has a given electrical length that is a multiple of approximately ¼ of a wavelength of a frequency used, and the other of the primary element and the secondary element has an electrical length that is different from the given electrical length.

15. A radio frequency identification (RFID) tag for attachment to an attachment object, the RFID tag comprising:
an inlay, the inlay including an IC chip configured to store identification information, a loop conductor connected to the IC chip, and an antenna unit connected to the loop conductor;
a magnetic sheet laminated on an attachment object side of the inlay; and
a spacer layer disposed between the magnetic sheet and the attachment object, wherein the antenna unit includes a primary element and a secondary element, the primary element including conductors connected to the loop conductor and extending away from each other from the loop conductor, and the secondary element includi

Assignees

• Daio Seishi Kk

Inventors

• Shimada Takuro
• Kondo Ryota
• Ikawa Taro
• MATSUNOSHITA Daiji

Classifications

• H01Q7/00

  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 title

• H01Q1/38

  formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface  H01Q15/142)} · CPC title

• G06K19/07786

  the antenna being of the HF type, such as a dipole · CPC title

• G06K19/07758

  arrangements for adhering the record carrier to further objects or living beings, functioning as an identification tag · CPC title

• G06K19/07771

  the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object · CPC title