Communications: radio wave antennas – Antennas – Loop type
Reexamination Certificate
2008-03-04
2008-03-04
Nguyen, Hoang V. (Department: 2821)
Communications: radio wave antennas
Antennas
Loop type
C343S741000, C343S742000, C343S866000, C340S572100, C340S572200
Reexamination Certificate
active
10550293
ABSTRACT:
A contactless reading system, wherein a chip card is fixed on a planar support of an object such as a book (11) for identification by means of the data contained in the chip card, and a mobile reader (16) provided with an antenna in order to read the data of the card. The antenna of the reader (16) consists of a small-sized convolution disposed in a series with a large-sized convolution, which are concentric and which have the same winding direction. A maximum value is obtained for the component (H) of the electromagnetic field produced by the antenna parallel to the antenna at a given distance from the antenna. Maximum reception by the chip card of electromagnetic signals emitted by the antenna is obtained when the antenna is disposed in a perpendicular position in relation to the support of the card and at the given distance from the card.
REFERENCES:
patent: 6486780 (2002-11-01), Garber et al.
patent: 6642896 (2003-11-01), Kim
patent: 2004/0100413 (2004-05-01), Waldner
patent: 0 766 200 (1997-04-01), None
patent: 11-313017 (1999-11-01), None
patent: 2003-69336 (2003-07-01), None
Pangaud Nicolas
Sabbah Elias
ASK S.A.
Karacsony Robert
Lydon James C.
Nguyen Hoang V.
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