Contactless circuit arrangement

Patent metadata

Field	Value
Publication number	US-9912385-B2
Application number	US-201615287804-A
Country	US
Kind code	B2
Filing date	Oct 7, 2016
Priority date	Oct 8, 2015
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

Various embodiments provide a contactless circuit arrangement. The contactless circuit arrangement includes at least one antenna, an antenna tuning circuit having a plurality of electrical components, and an energy supply interface which is connected to the antenna tuning circuit in an electrically conductive manner and is intended to supply electrical energy for electrically connecting or disconnecting at least one electrical component of the plurality of electrical components for adapting the antenna tuning circuit to a target frequency.

First claim

What is claimed is:

1. A contactless circuit arrangement, comprising:
at least one antenna;
an antenna tuning circuit having a plurality of electrical components; wherein the antenna tuning circuit further comprises one or more flip-flops configured to control the plurality of electrical components;
an energy supply interface which is connected to the antenna tuning circuit in an electrically conductive manner and is configured to supply electrical energy for electrically connecting or disconnecting at least one electrical component of the plurality of electrical components for adapting the antenna tuning circuit to a target frequency;
wherein the energy supply interface supplies electrical energy independently from the at least one antenna.

2. The contactless circuit arrangement of claim 1 , further comprising:
a circuit which is set up to be operated with energy received using the antenna.

3. The contactless circuit arrangement of claim 2 ,
wherein the circuit is set up as a communication circuit.

4. The contactless circuit arrangement of claim 3 ,
wherein the communication circuit is set up as an radio frequency identification (RFID) communication circuit.

5. The contactless circuit arrangement of claim 1 ,
wherein the antenna tuning circuit comprises a memory configured to store an item of control information for electrically connecting or disconnecting at least one electrical component of the plurality of electrical components.

6. The contactless circuit arrangement of claim 5 ,
wherein the memory is set up as a non-volatile memory.

7. The contactless circuit arrangement of claim 5 , further comprising:
a circuit which is coupled to the memory and is set up to be operated with energy received using the antenna;
wherein the circuit is set up to write the control information to the memory.

8. The contactless circuit arrangement of claim 1 ,
wherein the plurality of electrical components comprise one or more capacitors.

9. The contactless circuit arrangement of claim 8 ,
wherein the plurality of electrical components comprise a plurality of capacitors;
wherein the plurality of capacitors each comprises a constant capacitance.

10. The contactless circuit arrangement of claim 1 , further comprising:
a rectification circuit which is coupled to the at least one electrical component.

11. The contactless circuit arrangement of claim 1 , further comprising:
a switch which is coupled to the antenna in such a manner that the switch short-circuits the antenna in a switch position.

12. The contactless circuit arrangement of claim 1 ,
wherein the target frequency is a frequency in a range of approximately 13.56 MHz ±1 MHz.

13. The contactless circuit arrangement of claim 1 , further comprising:
a permanent energy storage which is connected to the energy supply interface in an electrically conductive manner.

14. The contactless circuit arrangement of claim 13 ,
wherein the permanent energy storage is a rechargeable energy storage.

15. A contactless circuit arrangement, comprising:
one or more antennas;
an antenna tuning circuit comprising a plurality of electrical components; wherein the antenna tuning circuit further comprises one or more flip-flops configured to control the plurality of electrical components; and
an energy supply interface electrically conductively coupled to the antenna tuning circuit, wherein the energy supply interface is configured to supply electrical energy to electrically connect or disconnect at least one of the plurality of electrical components to adapt the antenna tuning circuit to a predefined target frequency; wherein the energy supply interface supplies electrical energy independently from the at least one antenna.

16. The contactless circuit arrangement of claim 15 , further comprising:
a circuit which configured to be operated with energy received using the one or more antennas.

17. The contactless circuit arrangement of claim 15 ,
wherein the antenna tuning circuit comprises a memory configured to store control information to electrically connect or disconnect at least one electrical component of the plurality of electrical components.

18. The contactless circuit arrangement of claim 17 , further comprising:
a circuit coupled to the memory and configured to be operated with energy received using the one or more antennas;
wherein the circuit is configured to write the control information to the memory.

19. The contactless circuit arrangement of claim 15 ,
wherein the plurality of electrical components comprise one or more capacitors.

Assignees

• Infineon Technologies Ag

Inventors

• Holweg Gerald
• Steffan Christoph

Classifications

• H01Q1/2225

  used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal · CPC title

• H01Q9/0442

  with particular tuning means · CPC title

• G06K19/0726

  the arrangement including a circuit for tuning the resonance frequency of an antenna on the record carrier · CPC title

• G06K19/07773

  Antenna details (antennas for wireless devices, e.g. RFID tags, in general H01Q1/22) · CPC title

• G06K7/10316

  using at least one antenna particularly designed for interrogating the wireless record carriers (antennas in general H01Q1/22) · CPC title