Single loop transponder system and method

• US 5,491,483 A
• Filed: 01/05/1994
• Issued: 02/13/1996
• Est. Priority Date: 01/05/1994
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Sponsoring Entity: Texas Instruments, Inc.
• Inventors: D'Hont, Loek J.
• Primary Examiner(s): ELDRED, JOHN W
• Time in USPTO: 769 Days
• Field of Search: 342/42, 342/44, 342/50, 342/51, 340/568, 340/572
• US Class Current: 342/42
• CPC Class Codes: B65F 1/1484 : relating to the adaptation of receptacles to carry identification means
• CPC Class Codes: G01S 13/751 : wherein the responder or reflector radiates a coded signal
• 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 19/07756 : the connection being non-galvanic, e.g. capacitive
• CPC Class Codes: H01Q 1/2241 : used in or for vehicle tyres tyres in general B60C3/04

Abstract

An apparatus including an object 10 associated with a contactless, electronic identifier is disclosed herein. In one example, the object 10 is a trash bin. This object 10 is formed from a non-conductive material. A single-loop antenna 14 is disposed adjacent the object 10. An impedance transformer 18 which is matched to the single-loop antenna 14 is used to generate a desired inductance. A transponder 12 is also disposed near to and associated with the object 10. The transponder 12 is coupled to the antenna 14 through the impedance transformer 18.

Claims

1. An apparatus comprising:

an object formed of a non-conductive material;

a loop antenna disposed adjacent said object;

an impedance transformer matched to said loop antenna to a desired inductance; and

a transponder disposed near to and associated with said object, said transponder coupled to said antenna through said impedance transformer.

2. The apparatus of claim 1 wherein said antenna is attached to an external surface of said object.

3. The apparatus of claim 2 wherein said antenna is attached to an outer surface of said object.

4. The apparatus of claim 1 wherein said antenna is formed within said object.

5. The apparatus of claim 1 wherein said antenna comprises a foil antenna.

6. The apparatus of claim 1 wherein said antenna comprises a wire antenna.

7. The apparatus of claim 1 wherein said antenna is formed from an aluminum material.

8. The apparatus of claim 1 wherein said antenna is formed from a copper material.

9. The apparatus of claim 1 wherein said antenna comprises a single loop antenna.

11. The apparatus of claim 1 wherein said object is formed from a plastic material.

12. The apparatus of claim 1 wherein said object comprises a container.

13. The apparatus of claim 12 wherein said object comprises a waste container.

14. The apparatus of claim 1 wherein said object comprises a boat.

15. The apparatus of claim 1 wherein said object comprises a tire.

23. The apparatus of claim 5 wherein said foil antenna is about one inch wide.

24. The apparatus of claim 6 wherein wire antenna comprises a wire of about two to three millimeters in diameter.

25. The apparatus of claim 1 wherein said transponder includes an identification stored therein, said identification code for being communicated to a reader device.

10. An apparatus including an object associated with a contactless, electronic identifier comprising:

an object formed of a non-conductive material;

a loop antenna disposed adjacent said object, wherein said antenna is self-supporting and is not attached to said object;

an impedance transformer matched to said loop antenna to a desired inductance; and

a transponder disposed near to and associated with said object, said transponder coupled to said antenna through said impedance transformer.

16. A method of associating an object a with a contactless, electronic identifier comprising the steps of:

providing an object formed of a non-conductive material;

disposing a single-loop antenna adjacent said object;

attaching an impedance transformer to said single-loop antenna, said impedance transformer for transforming the single-loop antenna inductance to a desired inductance;

coupling a transponder to said antenna through said impedance transformer, said transponder disposed near to and associated with said object.

17. The method of claim 16 and further the steps of:

transmitting an interrogation signal from a reader to said antenna;

generating an identification signal within said transponder; and

transmitting said identification signal from said antenna to said reader.

18. The method of claim 16 wherein said object comprises a container.

19. A method of collecting trash comprising the steps of:

providing a trash bin formed of a non-conductive material, said trash bin having a transponder unit associated therewith;

providing a single-loop antenna adjacent said trash bin, said single-loop antenna coupled to said transponder via an impedance transformer;

transmitting an interrogation signal from a reader to said antenna;

generating an identification signal within said transponder; and

transmitting said identification signal from said antenna to said reader.

20. The method of claim 19 and further comprising the steps of:

weighing said trash bin;

emptying said trash bin;

weighing said trash bin; and

calculating the weight of trash removed from said trash bin during said emptying step.

21. The method of claim 19 wherein said step of forming a single loop antenna comprises the step of forming a single loop antenna on an external surface of said container.

22. The method of claim 19 wherein said step of forming a single loop antenna comprises the step of forming a single loop antenna within said container.