Electronic document with two antennas

• US 9,734,445 B2
• Filed: 09/27/2013
• Issued: 08/15/2017
• Est. Priority Date: 09/27/2013
• Status: Active Grant

• Current Assignee: Infineon Technologies AG
• Original Assignee: Infineon Technologies AG
• Inventors: Emsenhuber, Matthias, Haid, Josef, Pachler, Walther
• Primary Examiner(s): Mai, Thien T
• Application Number:
  US14/038,875
• Publication Number:
  US 20150090798A1
• Time in Patent Office: 1,418 Days
• CPC Class Codes: B42D 25/23 Identity cards
• CPC Class Codes: B42D 25/24 Passports
• CPC Class Codes: B42D 25/305 Associated digital information record carriers for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: G06K 19/0724 the arrangement being a circuit for communicating at a plurality of frequencies, e.g. for managing time multiplexed communication over at least two antennas of different types

Abstract

In various embodiments, a circuit arrangement is provided, including a first antenna tuned to a first frequency range, a second antenna tuned to a second frequency range being different from the first frequency range, a controller coupled to the first antenna and the second antenna, wherein the controller is configured to receive its operational power via at least one of the first antenna and the second antenna, and a deactivating structure configured to deactivate the communication of the controller via the second antenna upon reception of electromagnetic waves with the first frequency range via the first antenna.

Claims

1. A circuit arrangement comprising:

a first antenna tuned to a first frequency range;

a second antenna tuned to a second frequency range being different from the first frequency range;

wherein the second antenna is configured as a dipole antenna;

a first controller coupled to the first antenna and the second antenna, wherein the first controller is configured to receive its operational power via at least one of the first antenna and the second antenna;

wherein the first controller is connected to at least one of the first antenna and the second antenna; and

a deactivating structure configured to deactivate communication of the first controller via the second antenna upon reception of electromagnetic waves with the first frequency range via the first antenna, wherein the deactivating structure comprises a rectifier coupled to the first antenna and a switch coupled to the second antenna and configured to short circuit the second antenna;

wherein the rectifier is coupled to a control terminal of the switch;

wherein the second antenna is tuned to frequency from an ultra high frequency range.

2. Circuit arrangement according to claim 1,

wherein the first antenna is configured as a coil antenna.

3. Circuit arrangement according to claim 1,

wherein the first antenna is tuned to a frequency from a high frequency range.

4. Circuit arrangement according to claim 1,

wherein the first antenna is tuned to a frequency of approximately 13.56 MHz.

5. Circuit arrangement according to claim 1,

wherein the second antenna is tuned to a frequency of approximately 868 MHz.

6. Circuit arrangement according to claim 1,

wherein the first controller is coupled to the switch and configured to control the state of the switch.

7. Circuit arrangement according to claim 1,

wherein the rectifier is coupled to the switch and configured to control the state of the switch.

8. Circuit arrangement according to claim 1,

wherein the switch is coupled between the second antenna and at least one electronic component of a predefined impedance.

9. Circuit arrangement according to claim 1, further comprising:

a second controller coupled to the second antenna.

10. Circuit arrangement according to claim 9,

wherein the first controller is configured as an HF transponder.

11. Circuit arrangement according to claim 9,

further comprising a second controller configured as a UHF transponder.

12. Circuit arrangement according to claim 11,

wherein the deactivating structure comprises a switch configured to short circuit a power supply of the second controller.

13. Circuit arrangement according to claim 11,

wherein the first controller is coupled to the second controller and configured to generate a deactivation signal upon reception of electromagnetic waves with the first frequency range via the first antenna and thereby to deactivate the second controller chip.

14. An electronic document with a circuit arrangement embedded therein, the circuit arrangement comprising:

a first antenna tuned to a first frequency range;

a second antenna tuned to a second frequency range being different from the first frequency range;

wherein the second antenna is configured as a dipole antenna;

a controller coupled to the first antenna and the second antenna, wherein the controller is configured to receive its operational power via at least one of the first antenna and the second antenna;

wherein the first controller is connected to at least one of the first antenna and the second antenna; and

a deactivating structure configured to deactivate communication of the controller via the second antenna upon reception of electromagnetic waves with the first frequency range via the first antenna, wherein the deactivating structure comprises a rectifier coupled to the first antenna and a switch coupled to the second antenna and configured to short circuit the second antenna;

wherein the second antenna is tuned to frequency from an ultra high frequency range.

15. A circuit arrangement comprising:

a first antenna tuned to a first frequency range;

a second antenna tuned to a second frequency range being different from the first frequency range;

a first controller coupled to the first antenna and the second antenna, wherein the first controller is configured to receive its operational power via at least one of the first antenna and the second antenna;

wherein the first controller is connected to at least one of the first antenna and the second antenna; and

a deactivating structure configured to deactivate communication of the first controller via the second antenna upon reception of electromagnetic waves with the first frequency range via the first antenna, wherein the deactivating structure comprises a switch coupled to a rectifier having at least two transistors coupled to the first antenna, the switch coupled to the second antenna and configured to short circuit the second antenna.

16. Circuit arrangement according to claim 15, wherein the at least two transistors are configured as metal-oxide semiconductor transistors.

17. Circuit arrangement according to claim 15, wherein the at least two transistors are configured as metal-oxide semiconductor-diodes.