Extended range RFID system
First Claim
1. An RFID system comprising:
- an annular disc having a central hole therein, and including an annular conductive material surrounding the central hole;
a transponder; and
antenna elements;
wherein the antenna elements are electrically coupled to the transponder;
wherein the antenna elements at least partially overlie the conductive material of the disc;
wherein the antenna elements are capacitively coupled to the conductive material; and
wherein radiant energy is coupled to and from the system primarily using the antenna elements and the annular conductive material.
1 Assignment
0 Petitions
Accused Products
Abstract
A radio frequency identification (RFID) system for discs such as CDs, DVDs or minidiscs includes a special RFID transponder and antenna configuration. The discs normally include an outer metallized annular zone where information is stored, a central hole, and an inner annular zone between the hole and the outer annular zone. The transponder may be located in the inner annular zone, with antenna elements coupled to the transponder extending in opposite directions part way across the outer annular zone. Multilayer labels with a recess for the transponder chip, and antenna elements formed by conductive material may be employed to apply the RFID assembly to the discs. A monopole or dipole mode of antenna operation, prominently involving the metallized disc layer, results from the antenna configuration, and serves to more than double the range of the system.
23 Citations
30 Claims
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1. An RFID system comprising:
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an annular disc having a central hole therein, and including an annular conductive material surrounding the central hole; a transponder; and antenna elements; wherein the antenna elements are electrically coupled to the transponder; wherein the antenna elements at least partially overlie the conductive material of the disc; wherein the antenna elements are capacitively coupled to the conductive material; and wherein radiant energy is coupled to and from the system primarily using the antenna elements and the annular conductive material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A label for use with an annular disc having a central hole therein, and including inner and outer annular portions surrounding the central hole, the outer annular portion having an annular conductive material, and the inner portion being substantially free of conductive material, the label comprising:
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a face stock layer; a transponder; antenna elements electrically coupled to the transponder; a base layer; and an adhesive layer attached to the base layer for adhesively coupling the label to the disc; wherein the antenna elements and the transponder are between the adhesive layer and the face stock layer; and wherein the antenna elements are substantially co-linear with one another, configured to be diametrically opposed on opposite sides of the central hole when the label is adhesively coupled to the disc. - View Dependent Claims (18, 19, 20)
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21. A label for use with an annular disc having a central hole therein, and including inner and outer annular portions surrounding the central hole, the outer annular portion having an annular conductive material, and the inner portion being substantially free of conductive material, the label comprising:
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a face stock layer; a transponder; antenna elements electrically coupled to the transponder; a base layer; and an adhesive layer attached to the base layer for adhesively coupling the label to the disc; wherein the antenna elements and the transponder are between the adhesive layer and the face stock layer; and wherein the antenna elements are angled with respect to one another. - View Dependent Claims (22, 23, 24)
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25. A label for use with an annular disc having a central hole therein, and including inner and outer annular portions surrounding the central hole, the outer annular portion having an annular conductive material, and the inner portion being substantially free of conductive material, the label comprising:
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a face stock layer; a transponder; antenna elements electrically coupled to the transponder; a base layer; and an adhesive layer attached to the base layer for adhesively coupling the label to the disc; wherein the antenna elements and the transponder are between the adhesive layer and the face stock layer; and further comprising an interconnection of conductive material conductively coupling the transponder and at least one of the antenna elements; wherein the interconnection is configured to overlie the inner portion of the disc when the label is attached to the disc. - View Dependent Claims (26)
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27. A label for use with an annular disc having a central hole therein, and including inner and outer annular portions surrounding the central hole, the outer annular portion having an annular conductive material, and the inner portion being substantially free of conductive material, the label comprising:
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a face stock layer; a transponder; antenna elements electrically coupled to the transponder; a base layer; and an adhesive layer attached to the base layer for adhesively coupling the label to the disc; wherein the antenna elements and the transponder are between the adhesive layer and the face stock layer; and further comprising a conductive shunt that electrically couples the antenna elements together.
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28. A label for use with an annular disc having a central hole therein, and including inner and outer annular portions surrounding the central hole, the outer annular portion having an annular conductive material, and the inner portion being substantially free of conductive material, the label comprising:
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a face stock layer; a transponder; antenna elements electrically coupled to the transponder; a base layer; and an adhesive layer attached to the base layer for adhesively coupling the label to the disc; wherein the antenna elements and the transponder are between the adhesive layer and the face stock layer; and wherein the antenna elements are configured to at least in part overlie the outer annular portion when the label is adhesively coupled to the disc, and to thereby capacitively couple to the annular conductive material of the disc. - View Dependent Claims (29)
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30. An RFID system comprising;
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an annular disc that includes; an inner annular portion surrounding a central hole; and an outer annular portion surrounding the inner annular portion; and a transponder; wherein the outer annular portion includes an annular conductive material; wherein the transponder is electrically coupled to the annular conductive material, such that the annular conductive material functions as at least part of an antenna structure in conjunction with the transponder; and wherein the transponder is directly electrically coupled to antenna elements that in turn are capacitively coupled to the annular conductive material.
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Specification