Detector of radio frequency signals for contactless chip cards

Details Detector of radio frequency signals for contactless chip cards Detector of radio frequency signals for contactless chip cards

1998-09-18

2000-11-28

Hajec, Donald

Registers

Records

Conductive

235451, 235439, G06K 1906

Patent

active

061523739

ABSTRACT:
A contactless chip card includes a circuit for detecting the presence of radio frequency signals. A detector comprises at least one circuit for detecting the presence of radio signals by making direct use of the corresponding signals received by an antenna winding. In addition, a phase-shift detector detects the relative phase differences between signals provided by the antenna winding.

REFERENCES:
patent: 3816708 (1974-06-01), Walton
patent: 5670772 (1997-09-01), Goto
patent: 5801372 (1998-09-01), Yamaguchi
patent: 5874725 (1999-02-01), Yamaguchi
patent: 5942926 (1999-08-01), Yamaguchi

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