RFID device with content insensitivity and position insensitivity
First Claim
1. An RFID device comprising:
- a transponder chip;
an electrically conductive antenna structure operatively coupled to the transponder chip, wherein the conductive structure includes;
one or more electrical compensation elements that interact with nearby objects primarily using electric fields; and
one or more magnetic compensation elements that interact with the nearby objects primarily using magnetic fields;
wherein the compensation elements provide substantially position insensitive performance of the antenna structure over a range of positions relative to nearby objects; and
wherein, over the range of positions, some of the compensation elements affect antenna performance the antenna structure in one way, while other of the compensation elements affect the antenna performance in an opposite way.
2 Assignments
0 Petitions
Accused Products
Abstract
An RFID device includes an antenna structure that provides good performance throughout a range of different positions relative to nearby materials, such as metallic objects in a carton or other container. The antenna structure has compensation elements that interact with the nearby materials to provide good performance over the range of different positions. The compensation elements include both electrical compensation elements, which interact with the nearby materials primarily using electric fields, and magnetic compensation elements, which interact with the nearby materials primarily using magnetic fields. The electrical compensation elements and the magnetic compensation elements may be selected and may be positioned within the antenna structure such that the performance of the antenna structure is substantially unchanged (or at least acceptable) through the range of different positions.
166 Citations
24 Claims
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1. An RFID device comprising:
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a transponder chip; an electrically conductive antenna structure operatively coupled to the transponder chip, wherein the conductive structure includes; one or more electrical compensation elements that interact with nearby objects primarily using electric fields; and one or more magnetic compensation elements that interact with the nearby objects primarily using magnetic fields; wherein the compensation elements provide substantially position insensitive performance of the antenna structure over a range of positions relative to nearby objects; and wherein, over the range of positions, some of the compensation elements affect antenna performance the antenna structure in one way, while other of the compensation elements affect the antenna performance in an opposite way. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An RFID device comprising:
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a transponder chip; an electrically conductive antenna structure operatively coupled to the transponder chip, wherein the conductive structure includes; one or more electrical compensation elements that interact with nearby objects primarily using electric fields; and one or more magnetic compensation elements that interact with the nearby objects primarily using magnetic fields; wherein the compensation elements provide substantially position insensitive performance of the antenna structure over a range of positions relative to nearby objects; wherein the antenna structure includes a pair of antenna elements coupled to the transponder chip; wherein each of the antenna elements include respective of the electrical compensation elements; wherein the magnetic compensation elements electrically connect together the antenna elements; and wherein the magnetic compensation elements include electrically conductive inductor lines.
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15. An RFID device comprising:
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a transponder chip; an electrically conductive antenna structure operatively coupled to the transponder chip, wherein the conductive structure includes; one or more electrical compensation elements that interact with nearby objects primarily using electric fields; and one or more magnetic compensation elements that interact with the nearby objects primarily using magnetic fields; wherein the compensation elements provide substantially position insensitive performance of the antenna structure over a range of positions relative to nearby objects; wherein the antenna structure includes a pair of antenna elements coupled to the transponder chip; wherein each of the antenna elements include respective of the electrical compensation elements; wherein the magnetic compensation elements electrically connect together the antenna elements; wherein the magnetic compensation elements include an open loop magnetic compensation element; and wherein the open loop magnetic compensation element encloses a substantially rectangular area.
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16. An RFID device comprising:
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a transponder chip; an electrically conductive antenna structure operatively coupled to the transponder chip, wherein the conductive structure includes; one or more electrical compensation elements that interact with nearby objects primarily using electric fields; and one or more magnetic compensation elements that interact with the nearby objects primarily using magnetic fields; wherein the compensation elements provide substantially position insensitive performance of the antenna structure over a range of positions relative to nearby objects; wherein the compensation elements include tapered areas of electrically conductive material; and wherein the tapered areas have curved ends at distal parts of the compensation elements that function as electrical compensation elements.
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17. A combination comprising:
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an RFID device that includes; a transponder chip; an electrically conductive antenna structure operatively coupled to the transponder chip, wherein the conductive structure includes; one or more electrical compensation elements that interact with nearby objects primarily using electric fields; and one or more magnetic compensation elements that interact with the nearby objects primarily using magnetic fields; and an object to which the RFID device is attached; wherein the compensation elements provide substantially position insensitive performance of the antenna structure over a range of positions; wherein the object is a carton or container containing metal objects; and wherein the range of positions includes a first position that has a center of the RFID device halfway between adjacent of the metal objects, and a second position that has the center of the RFID device at a location closest to one of the metal objects. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification