Device and method for transmitting and receiving data of a passive RFID tag in an electromagnetically shielded housing

Patent metadata

Field	Value
Publication number	US-11386316-B2
Application number	US-201916763879-A
Country	US
Kind code	B2
Filing date	May 14, 2019
Priority date	May 25, 2018
Publication date	Jul 12, 2022
Grant date	Jul 12, 2022

Abstract

A device for wirelessly transmitting and receiving data of an RFID tag introduced in an electromagnetically shielded housing, wherein a transmission region is provided in the housing wall of the housing and wherein a transceiver is connected to the RFID tag. The transceiver is configured to transmit and/or receive data from the RFID tag through the transmission region, wherein a double coil formed by two coil assemblies is provided directly above or below the transmission region for coupling to an external receiving unit of a reading device and for coupling to the transceiver.

First claim

The invention claimed is:

1. A device for wirelessly transmitting and receiving data of a radio frequency identification (RFID) tag positioned in an electromagnetically shielded housing, wherein a transmission region is provided in a housing wall of the housing and wherein a transceiver connected to the RFID tag is also provided, wherein the transceiver is configured to transmit and/or receive data from the RFID tag through the transmission region, wherein a double coil formed by two coil assemblies is provided directly above or below the transmission region for coupling to an external receiving unit of an external reading device and for coupling to the transceiver.

2. The device according to claim 1 , wherein the transceiver is configured with a rod core choke or a ferrite core with a coil assembly surrounding the rod core choke or the ferrite core.

3. The device according to claim 2 , wherein the coil assembly surrounding the rod core choke or the ferrite core is connected in series or in parallel to the RFID tag via a resonance circuit or an impedance for tuning the resonance to a receiving system.

4. The device according claim 1 , wherein the double coil is configured such that the first coil assembly is wound as an outer coil assembly in a same winding plane around a second coil assembly, wherein the second coil assembly is configured as an inner coil assembly.

5. The device according to claim 4 , wherein the inner coil assembly and the outer coil assembly are wound or formed from a common coil wire.

6. The device according to claim 1 , wherein the two coil assemblies are connected in series or in parallel to the RFID tag via a resonance circuit or an impedance for tuning the resonance of the transmitting unit configured in the device.

7. The device according to claim 1 , wherein the double coil is disposed on or in a flat coil carrier.

8. The device according to claim 7 , wherein the coil carrier is disposed above the transmission region.

9. The device according to claim 1 , wherein the transceiver is disposed directly below the transmission region.

10. The device according to claim 1 , wherein the transmission region is a transmission opening in the form of a recess in the housing wall having a lower shielding attenuation than a surrounding housing.

11. The device according to claim 1 , wherein the transmission region is in the form of a region having a lower shielding attenuation than a surrounding housing of the electromagnetically shielded housing.

12. The device according to claim 11 , wherein the shielding attenuation in the transmission region is reduced by a factor of 0.5.

13. The device according to claim 11 , wherein the shielding attenuation in the transmission region is less than a shielding attenuation in an area of the housing wall immediately surrounding the transmission region.

14. The device according to claim 11 , wherein the shielding attenuation in the transmission region is less than a shielding attenuation in a remainder of the surrounding housing.

15. A method for wirelessly transmitting and receiving data of an RFID tag positioned in an electromagnetically shielded housing to an external receiving unit disposed outside of the housing, using the device of claim 1 , comprising the following steps:
a) electromagnetic coupling between a coil of the transceiver and the double coil, and
b) electromagnetic coupling between the double coil and the external receiving unit for transmitting data to the receiving unit and/or receiving data from the receiving unit.

16. The method according to claim 15 , wherein the receiving unit is positioned above the transmission region outside the housing for transmitting and/or receiving data.

17. The method according to claim 15 , wherein in step a) the electromagnetic coupling is between a coil of the transceiver and an inner coil assembly of the double coil.

18. The method according to claim 15 , wherein in step b) the electromagnetic coupling is between an outer coil assembly of the double coil and the external receiving unit.

Assignees

• Ebm Papst Mulfingen Gmbh & Co Kg

Inventors

• Gehringer Jan
• Humm Markus
• Schroth Sebastian
• Wystup Ralph

Classifications

• G06K19/07794 Primary

  the record carrier comprising a booster or auxiliary antenna in addition to the antenna connected directly to the integrated circuit · CPC title

• G06K19/07783

  the coil being planar · CPC title