Modulator for electromagnetic signals transmitted by a...

Details Modulator for electromagnetic signals transmitted by a... Modulator for electromagnetic signals transmitted by a...

2007-02-13

2007-02-13

Ha, Dac V. (Department: 2611)

Pulse or digital communications

Pulse transmission via radiated baseband

C375S259000, C375S377000, C307S104000, C343S856000, C343S857000, C455S113000, C455S114100, C455S118000, C455S126000

Reexamination Certificate

active

10416180

ABSTRACT:
A data transmission device using electromagnetic wave radiation in a contactless transceiver system toward a contactless object, the data bits transmitted corresponding to the half cycle of an initial time interval during which electromagnetic waves are emitted at a predetermined carrier frequency and to a second splitting time interval during which there is a split in transmission of the electromagnetic waves at the predetermined carrier frequency. During said second splitting time interval, generation means (40, 42, 44, 46, 48) generate electromagnetic waves having a frequency which is double the predetermined carrier frequency resulting in an attenuation of the radiated field by the antenna greater than a predetermined value such as 30 dB.

REFERENCES:
patent: 5451958 (1995-09-01), Schuermann
patent: 5712630 (1998-01-01), Nanboku et al.
patent: 6122492 (2000-09-01), Sears
patent: 2002/0105065 (2002-08-01), Parrault
patent: 2002/0105232 (2002-08-01), Parrault

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