Tunable RFID tag for global applications
First Claim
1. An RF transponder, comprising:
- a transponder integrated circuit;
an antenna connected to said RE transponder integrated circuit; and
at least one parasitic element adapted to interact electrically with said antenna and thereby affect antenna impedance, wherein orientation of said at least one parasitic element with respect to said antenna is selectable from among a plurality of pre-defined orientations to achieve a desired operational frequency band for the RF transponder.
1 Assignment
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Accused Products
Abstract
An RF transponder comprises a transponder integrated circuit, an antenna connected to the transponder integrated circuit, and at least one parasitic element adapted to interact electrically with the antenna and thereby affect antenna impedance. The orientation of the parasitic element with respect to the antenna is selected to achieve a desired operational frequency band for the RF transponder. Specifically, the spacing between the antenna and the parasitic element is selected to achieve the desired operational frequency band. For example, a first selected spacing may enable an operational frequency band suitable for a first geographic region (e.g., the United States), a second selected spacing may enable an operational frequency band suitable for a second geographic region (e.g., Europe), and a third selected spacing may enable an operational frequency band suitable for a third geographic region (e.g., Japan).
61 Citations
38 Claims
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1. An RF transponder, comprising:
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a transponder integrated circuit; an antenna connected to said RE transponder integrated circuit; and at least one parasitic element adapted to interact electrically with said antenna and thereby affect antenna impedance, wherein orientation of said at least one parasitic element with respect to said antenna is selectable from among a plurality of pre-defined orientations to achieve a desired operational frequency band for the RF transponder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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- 16. A method of tuning an RF transponder having a transponder integrated circuit and an antenna connected to said RF transponder integrated circuit, the RF transponder further having a plurality of pre-defined orientations for disposing a parasitic element, the method comprising selectively disposing at least one parasitic element with respect to said antenna in one of the plurality of pre-defined orientations to achieve a desired operational frequency band for the RF transponder, said at least one parasitic element being adapted to interact electrically with said antenna and thereby affect antenna impedance in correspondence with spacing between said antenna and said at least one parasitic element.
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27. An RF transponder kit comprising:
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at least one RF transponder including a substrate, a transponder integrated circuit affixed to said substrate, and an antenna affixed to said substrate and electrically connected to said transponder integrated circuit; and a plurality of parasitic elements each adapted to interact electrically with said antenna and thereby affect antenna impedance, wherein said substrate comprises a plurality of pre-defined orientations that are each adapted to receive selected ones of said plural parasitic elements oriented with respect to said antenna to achieve a desired operational frequency band for the RF transponder. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification