Active capacitive coupling RFID device, system and method of production thereof

• US 20070024425A1
• Filed: 07/31/2006
• Published: 02/01/2007
• Est. Priority Date: 08/01/2005
• Status: Abandoned Application

• Current Assignee: PowerID Ltd.
• Original Assignee: PowerID Ltd.
• Inventors: Nitzan, Zvi, Karmon, Yoram, Lavee, Doron
• Application Number:
  US11/495,556
• Publication Number:
  US 20070024425A1
• Time in Patent Office: Days
• US Class Current: 340/10.100
• 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

Abstract

The present invention is of an active RFID system configured for SIMPLEX two way communication based on conductive coupling, wherein two way communication is non-simultaneous and can operate on a single frequency comprising at least one capacitive coupling reader, wherein the reader is configured to transmit modulated or unmodulated RF electric signals and to receive and decode data transmitted by the transponder; at least one active capacitive coupling RFID transponder comprising at least one integrated circuit, which is arranged to store a code comprising information and which is configured for capacitive coupled RFID transponder application; at least one antenna configured to receive signal from the at least one reader, and transmit the transponder code comprising information; and at least one power source for providing energy to operate the at least one integrated circuit and transponder transmission; and at least one data processing device for processing the data received from the reader. The fully active transponder includes a carrier frequency control circuit wherein the carrier frequency generator is configured to facilitate correction of frequency error in comparison to the reader transmitter carrier frequency.

Claims

1. An active capacitive coupling RFID system, comprising:

(a) at least one reader, wherein the reader is configured to transmit modulated or unmodulated RF electrical signals and to receive and decode data transmitted by a transponder;

(b) at least one active capacitive coupling RFID transponder comprising;

(i) at least one integrated circuit, which is arranged to store a code comprising information and which is configured to generate, modulate and to transmit an RF carrier on LF or HF RFID frequency that comprises the stored code to the reader on a capacitive coupled communication channel;

(ii) at least one antenna configured to receive electric signal via capacitive coupling from the at least one reader, and transmit the transponder code comprising information; and

(iii) at least one power source for providing energy to the at least one integrated circuit and the transponder transmission; and

(c) at least one data processing device for processing the data received from the reader.

2. The active capacitive coupling RFID system of claim 1, wherein the system is configured for SIMPLEX two way communication, wherein the two way communication is not simultaneous.

3. The active capacitive coupling RFID system of claim 1, wherein the SIMPLEX communication link operates on a single frequency.

4. The active capacitive coupling RFID system of claim 1, wherein the transponder further comprises a carrier frequency generator.

5. The active capacitive coupling RFID system of claim 4, wherein the carrier frequency generator is configured to facilitate correction of frequency error in comparison to the reader transmitter carrier frequency.

6. The active capacitive coupling RFID system of claim 1, wherein the at least one power source is a thin and flexible power source.

7. The active capacitive coupling RFID system of claim 1, wherein the at least one antenna comprises carbon/graphite.

8. The active capacitive coupling RFID system of claim 1, wherein at least one of the power source, antenna and IC is made by a printing technique.

9. The active capacitive coupling RFID system of claim 1, wherein the active capacitive coupling RFID transponder device is disposable.

10. The active capacitive coupling RFID system of claim 1, wherein the active capacitive coupling RFID transponder device further comprises a substrate base layer.

11. The active capacitive coupling RFID system of claim 1, wherein the integrated circuit is connected to the at least one antenna and the at least one power source by connection means.

12. The active capacitive coupling RFID system of claim 1, wherein the active capacitive coupling RFID transponder device is a fully or partially printed device.

13. The active capacitive coupling RFID system of claim 1, further comprising at least one conductive surface configured as a reader antenna.

14. The active capacitive coupling RFID system of claim 1, wherein the reading range of the reader is up to about 1 meter.

15. The active capacitive coupling RFID system of claim 1, wherein the transponder device is thin and flexible.

16. The active capacitive coupling RFID system of claim 1, wherein at least one active capacitive coupling RFID transponder device is a plurality of transponder devices.

17. The active capacitive coupling RFID system of claim 1, wherein the reader is a multi-tag reader.

18. The active capacitive coupling RFID system of claim 1 for use in at least one of monitoring shelf items and items on a conveyer.

19. An active capacitive coupling RFID transponder device based on capacitive coupling, comprising:

(a) at least one integrated circuit, which is arranged to store a code comprising information and which is configured to generate, modulate and to transmit an RF carrier on LF or HF RFID frequency that comprises the stored code to the at least one reader on a capacitive coupled communication channel;

(b) at least one antenna configured to receive electric signal via capacitive coupling from the at least one reader, and transmit the transponder code comprising information; and

(c) at least one power source for providing energy to operate the at least one integrated circuit and the transponder transmission.

20. The active capacitive coupling RFID device of claim 19 further comprising a carrier frequency control circuit for controlling carrier frequency according to the reader carrier frequency.

21. The active capacitive coupling RFID device of claim 19, wherein the device is thin and flexible.

22. The active capacitive coupling RFID transponder device of claim 19, wherein the device further comprises a substrate base layer.

23. The active capacitive coupling RFID transponder device of claim 22, wherein the substrate base layer is paper.

24. The active capacitive coupling RFID transponder device of claim 19, wherein the device is integrally formed with an object or packaging.

25. The active capacitive coupling RFID transponder device of claim 19, wherein the at least one IC and the at least one power source are disposed on a base layer and the at least one antenna is disposed directly on an object or packaging.

26. The active capacitive coupling RFID transponder device of claim 22, wherein the substrate base layer comprises an interposer.

27. The active capacitive coupling RFID transponder device of claim 19, wherein the at least one power source is at least one electrochemical cell and wherein the at least one electrochemical cell comprises

(a) a first layer of insoluble negative pole;

(b) a second layer of insoluble positive pole; and

(c) a third layer of aqueous electrolyte disposed between the first and second layers and including

(i) a deliquescent material for keeping the electrochemical cell wet at all times;

(ii) an electroactive soluble material for obtaining ionic conductivity; and

(iii) a polymer for obtaining a desired viscosity for adhering the first and second layers to the third layer.

28. The active capacitive coupling RFID transponder device of claim 19, wherein the IC is connected to the antenna and the battery by connection means.

29. The active capacitive coupling RFID transponder device of claim 19 wherein the device is a partially or fully printed device.

30. The active capacitive coupling RFID transponder device of claim 19, wherein the IC is an ASIC comprising a local oscillator, frequency error detector and frequency control circuit, serial read only and read/write memory, bit rate generator and a modulator, RF detector/demodulator and programmable timer, an energy saving module and POR circuit and a battery level indicator.

31. The active capacitive coupling RFID transponder device of claim 30, wherein the frequency control circuit comprises a limited frequency range voltage controlled oscillator, a frequency error detector and a sample and hold circuit wherein the frequency error detector facilitates comparison of the local oscillator frequency with the received carrier frequency from the reader and production of an error signal that is sampled by the sample and hold circuit and wherein the output of the sample and hold circuit facilitates adjustment of the local oscillator frequency until the error detector indicates no error.

32. The active capacitive coupling RFID transponder device of claim 30, wherein the frequency control circuit comprises a frequency error detector and a fixed frequency RC oscillator with a bank switched resistor for frequency adjustment and wherein the frequency error detector can choose the required resistor combination until the frequency error is below a preset value.

33. The active capacitive coupling RFID transponder device of claim 19 further comprising an energy saving manager comprising a periodic sleep/wake-up cycle for facilitating minimizing energy drain of the at least one power source.

34. The active capacitive coupling RFID transponder device of claim 19, wherein the at least one antenna comprises a conductive material and a portion of the conductive material of the at least one antenna is configured to function as part of the at least one power source.

35. The active capacitive coupling RFID transponder device of claim 19, wherein the at least one power source comprises at least one current collector and wherein the at least one current collector of the at least one power source is configured to function as part of the at least one antenna.

36. The active capacitive coupling RFID transponder device of claim 19, wherein the antenna conductive material comprises carbon.

37. The active capacitive coupling RFID transponder device of claim 19, wherein the device further comprises attachment means.

38. An active capacitive coupling RFID transponder device based on capacitive coupling, comprising:

(a) electronic circuitry configured for capacitive coupling RFID transponder application;

(b) at least one conductive ink layer pattern configured to receive an electric field energy signal from at least one reader and transmit the received signal modulated by the transponder data, wherein at least a part of the conductive ink layer pattern is configured to receive the electric field energy signal via capacitive coupling from the at least one reader, transmit the received signal modulated by the transponder data and collect current from an integrally formed power source; and

(c) at least one thin and flexible power source for providing energy to operate the electronic circuitry and the transponder transmission.

39. A battery energy saving system for managing power of an RFID transponder device based on capacitive coupling comprising:

(a) an energy saving module configured to operate the transponder device in registered and unregistered modes; and

(b) at least one timer in communication with the energy saving module to facilitate changing modes from the registered mode to the unregistered mode when the transponder device is not called by a reader for a preset time.

40. An active capacitive coupling RFID system, comprising:

(a) at least one reader, wherein the reader is configured to transmit modulated or unmodulated RF electrical signals and to receive and decode data transmitted by a transponder;

(b) at least one active capacitive coupling RFID transponder comprising;

(i) at least one device comprising;

(1) an interposer comprising a substrate base layer and attachment means;

(2) at least one integrated circuit, which is arranged to store a code comprising information and which is configured for capacitive coupled RFID transponder application; and

(3) at least one power source for providing energy to operate the at least one integrated circuit and transponder transmission, wherein the at least one power source and the at least one integrated circuit are disposed on the interposer substrate base layer; and

(ii) at least one antenna configured to receive the electric signals from the at least one reader and to transmit the transponder code comprising information; and

(c) at least one data processing device for processing the data received from the reader.