Communications: electrical – Selective – Interrogation response
Reexamination Certificate
2007-05-08
2007-05-08
Hofsass, Jeffery (Department: 2612)
Communications: electrical
Selective
Interrogation response
C340S010200, C340S010300, C340S010400, C340S572300, C340S572500, C340S572700, C235S462260
Reexamination Certificate
active
10485561
ABSTRACT:
In a non-contacting smart card interrogator (1) a first end (A) of an eighth-wave transmission line (13) is connected to a terminal connecting a first receiver (16) to a transmission line (14), and to a second end (B) of the transmission line (14) the carrier wave generator (11) is connected. To the first end (A) of the eighth-wave transmission line (13) the first amplitude demodulation receiver (16) and to the second end (B) thereof a second amplitude demodulation receiver (16′) are connected. In the non-contacting smart card interrogator of the invention an effective use of amplitude demodulation is made possible by changing the phase modulation into an amplitude one by means of a passive element, whereby, however, no noise source has been introduced into the system.
REFERENCES:
patent: 5703573 (1997-12-01), Fujimoto et al.
patent: 6208235 (2001-03-01), Trontelj
patent: 2008600 (1970-09-01), None
patent: 19938998 (2001-03-01), None
patent: 0466949 (1992-01-01), None
patent: 11220424 (1999-08-01), None
patent: WO 113597 (2001-02-01), None
Kunc Vinko
{hacek over (S)}tern Anton
Au Scott
Hofsass Jeffery
Jacobson & Holman PLLC
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