Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2008-03-24
2010-11-30
Hess, Daniel A (Department: 2876)
Registers
Coded record sensors
Particular sensor structure
C340S010300, C340S010400
Reexamination Certificate
active
07841528
ABSTRACT:
The invention relates to contactless communication systems between a moving object and a reader, in particular systems in which the moving object is a chip card or an identification tag. To enhance communication security, the card reader transmits, from a radiofrequency transmission antenna separate from the main communication antenna, a disturbance signal having the same frequency and modulation type characteristics as the response signal expected from the card to the reader; the electromagnetic coupling between this separate antenna and the antenna of the reader is, however, such that the latter does not “see” the transmitted disturbance but detects only the response from the card; on the other hand, the environment between the card and the reader sees the response from the card only mixed with the disturbance signal.
REFERENCES:
patent: 2004/0100359 (2004-05-01), Reade et al.
patent: 2007/0016944 (2007-01-01), Hansen
patent: 2009/0021343 (2009-01-01), Sinha
patent: 2 875 976 (2006-03-01), None
patent: WO 2005020445 (2005-03-01), None
patent: WO 2006 035178 (2006-04-01), None
Savry Olivier
Thomas Thierry
Commissariat a l''Energie Atomique
Hess Daniel A
Lowe Hauptman & Ham & Berner, LLP
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