RFID tag

Details RFID tag RFID tag

2006-04-28

2008-05-27

Trieu, Van T. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S572800, C340S572100

Reexamination Certificate

active

07378972

ABSTRACT:
In an RFID tag, a ground portion attached to a magnetic recording medium so as to be electromagnetically coupled to a metal surface inside the magnetic recording medium in a high-frequency band, a monopole portion provided on a same plane as the ground portion and inside the ground portion, and a feeding portion connected to one end of the monopole portion and mounting thereon an LSI chip are provided. The ground portion has a ring shape, the monopole portion bent along the ring shape has a length for impedance matching with the feeding portion, and this length can be adjusted by providing a folded portion or a meander portion. Alternatively, the monopole portion may be decentered from the ground portion so as to locate a vicinity of the feeding portion away from the ground portion and to bring a vicinity of the tip portion near to the ground portion, in which case an adjusting portion can be provided at the tip portion of the monopole portion.

REFERENCES:
patent: 6127989 (2000-10-01), Kunz
patent: 6806842 (2004-10-01), King et al.
patent: 7248221 (2007-07-01), Kai et al.
patent: 2004/0052202 (2004-03-01), Brollier
patent: 2005/0093678 (2005-05-01), Forster et al.
patent: 1434301 (2004-06-01), None
patent: A-2003-141650 (2003-05-01), None
patent: WO 00/23994 (2000-04-01), None
06008871.3-1248, Extended European Search Report, Mar. 16, 2007.

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