System for the contactless exchange of data, and responder for use in such a system

• US 5,426,667 A
• Filed: 06/17/1993
• Issued: 06/20/1995
• Est. Priority Date: 06/18/1992
• Status: Expired due to Fees

• Current Assignee: N.V. Nederlandsche Apparatenfabriek Nedap
• Original Assignee: N.V. Nederlandsche Apparatenfabriek "Nedap"
• Inventors: van Zon, Bernardus C. M.
• Primary Examiner(s): Coles, Sr., Edward L.
• Assistant Examiner(s): Williams, Kimberly A.
• Application Number:
  US08/077,521
• Time in Patent Office: 733 Days
• Field of Search: 455/41, 375/7
• US Class Current: 375/219
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• 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
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer

Abstract

Disclosed is a system for the contactless exchange of data between one or more transmitter/receiver devices and a plurality of responders. According to the invention, at least one of the responders is designed to exchange data via a microwave connection with a transmitter/receiver device operating in the microwave range, and to exchange data via an inductive coupling with an inductively operating transmitter/receiver device.

Claims

1. A system for the contactless exchange of data between at least one transmitter/receiver device and a plurality of responders, wherein at least one of the responders is designed to exchange data via a microwave connection with at least one of said at least one transmitter/receiver device operating in the microwave range and to exchange data via an inductive coupling with at least one inductively operating transmitter/receiver device, said at least one responder comprising a microwave antenna device, an inductively operating antenna device, and a data carrier, in which data is stored, wherein between the data carrier and the microwave antenna device means are connected for modulating a received microwave signal with data stored in the data carrier and wherein between the data carrier and the inductively operating antenna device means are connected for modulating an inductively received signal with data stored in the data carrier.

2. A system according to claim 1, wherein the microwave antenna device is designed for retroreflection of microwave energy.

3. A system according to claim 1, wherein the microwave antenna device is connected with a demodulator, which can demodulate a signal modulated on a received microwave signal and can apply the signal obtained after demodulation to the data carrier.

4. A system according to claim 3, wherein the signal obtained after demodulation is converted via a first AC/DC converter into supply voltage for the responder.

5. A system according to claim 4, wherein the inductively operating antenna device is connected with a second AC/DC converter, which in operation converts energy received by the antenna device into a DC supply voltage for the responder, and wherein, of the first and the second AC/DC converters, at least the second AC/DC converter is connected with a detector, which can demodulate data modulated on the supply voltage and can store the data in the data carrier.

6. A system according to claim 3, wherein the demodulator connected with the microwave antenna device is connected with a switching means via at least an integrator, and wherein, if the voltage built up by the integrator achieves a predetermined threshold value, said switching means connects an internal supply source provided in the responder with at least the data carrier.

7. A system according to claim 6, wherein the internal supply source comprises one or more solar cells.

8. A system according to claim 6, wherein between the demodulator and the integrator an amplifier with a low energy consumption is connected, which is permanently connected with the supply source.

9. A system according to claim 1, wherein the microwave antenna device is connected with a modulator, which is further connected with the data carrier and which can modulate data provided by the data carrier on microwave energy received by the microwave antenna device.

10. A system according to claim 1, wherein the inductively operating antenna device is connected with a first AC/DC converter, which in operation converts energy received by the antenna device into a DC supply voltage for the responder.

11. A system according to claim 1, wherein the data carrier is provided on a separate insert unit, which can be removably placed in a purposely formed receiving space of the housing of the responder.

12. A system according to claim 11, wherein the insert unit is provided with its own antenna coil device for contactless inductive coupling with the inductively operating antenna device of the associated responder.

13. A system according to claim 12, wherein the insert unit comprises a memory section, a modulator and a demodulator for modulating and demodulating, respectively, energy induced in the antenna coil device.

14. A system according to claim 13, wherein the insert unit is provided with its own internal supply source.

15. A system according to claim 14, wherein the internal supply sources comprise one or more solar cells.

16. A system according to claim 11, wherein the insert unit is constructed as a card.

17. A system according to claims 11, wherein the means for modulating a received microwave signal comprise an encoder which receives data provided by the data carrier and modulates it on an auxiliary carrier wave and applies the modulated auxiliary carrier wave to a modulator connected with the microwave antenna device, which modulator in operation modulates a received microwave signal with the modulated auxiliary carrier wave.

18. A system according to claim 17, wherein the data from the data carrier reaches the encoder via a filter and a threshold detector.

19. A system according to claim 1, wherein said at least one inductively operating transmitter/receiver device, belonging to the system, is designed to generate an electromagnetic field with a predetermined frequency and wherein said at least one of said at least one transmitter/receiver device operating in the microwave range, belonging to the system, is designed to emit a microwave signal on which a signal with the same frequency as the said predetermined frequency or with a frequency from which the predetermined frequency can simply be derived, has been modulated.

20. A system according to claim 19, wherein at least one of said at least one inductively operating transmitter/receiver device is designed for modulating the predetermined frequency with a data signal.

21. A responder of a system for the contactless exchange of data between one or more transmitter/receiver devices and a plurality of such responders, wherein the responder is designed to exchange data via a microwave connection with a transmitter/receiver device operating in the microwave range and to exchange data via an inductive coupling with an inductively operating transmitter/receiver device, the responder comprising a microwave antenna device, an inductively operating antenna device, and a data carrier, in which data is stored, wherein between the data carrier and the microwave antenna device means are connected for modulating a received microwave signal with data stored in the data carrier and wherein between the data carrier and the inductively operating antenna device means are connected for modulating an inductively received signal with data stored in the data carrier.

22. An insert unit of a system for the contactless exchange of data between one or more transmitter/receiver devices and a plurality of responders, wherein at least one of the responders is designed to exchange data via a microwave connection with a transmitter/receiver device operating in the microwave range and to exchange data via an inductive coupling with an inductively operating transmitter/receiver device, the at least one responder comprising a microwave antenna device, an inductively operating antenna device, and a data carrier, in which data is stored, wherein between the data carrier and the microwave antenna device means are connected for modulating a received microwave signal with data stored in the data carrier and wherein between the data carrier and the inductively operating antenna device means are connected for modulating an inductively received signal with data stored in the data carrier, said insert unit comprising the data carrier and wherein the insert unit may be removably placed in a receiving space of a housing of the responder.