RFID device with content insensitivity and position insensitivity
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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.
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Citations
20 Claims
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1-2. -2. (canceled)
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3. 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 the 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. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification