Tunable RFID tag for global applications

Details Tunable RFID tag for global applications Tunable RFID tag for global applications

2008-01-29

2008-01-29

Crosland, Donnie L. (Department: 2612)

Communications: electrical

Condition responsive indicating system

With particular system function

C340S572100, C340S572700, C340S572800, C340S010100, C343S815000, C343S834000, C342S042000, C342S051000

Reexamination Certificate

active

07323977

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).

REFERENCES:
patent: 6028564 (2000-02-01), Duan et al.
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patent: 6154137 (2000-11-01), Goff et al.
patent: 6285342 (2001-09-01), Brady et al.
patent: 6535175 (2003-03-01), Brady et al.
patent: 2001/0021643 (2001-09-01), Itoh
patent: 2005/0046573 (2005-03-01), Velasco et al.
patent: 2005/0270159 (2005-12-01), Brady et al.

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