Non-contact IC card communicating at multiple frequencies

Details Non-contact IC card communicating at multiple frequencies Non-contact IC card communicating at multiple frequencies

1995-07-11

1996-12-17

Hajec, Donald T.

Registers

Records

Fluorescent, phosphorescent, radiation emitting

235492, 4551931, 455290, G06K 1906

Patent

active

055856179

ABSTRACT:
A non-contact IC card capable of communicating with external equipment at various communication frequencies. An antenna circuit of variable frequency and a frequency switching circuit for supplying communication clock signals of variable frequency to a modulator-demodulator circuit are provided so that communication is performed by switching a constant of the antenna circuit and the frequency of the communication clock signal generated from the frequency switching circuit in accordance with the frequency of external equipment with which communication is effected.

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Vincent Cordonnier, Smart Cards: Present And Future Applications And Techniques, Oct. 1991, pp. 207-211.
Ken-Ichi Konno, Toshiyuki Haga, Takagumi Kimura 2.45 GHZ Antennas Developed For Wireless Card Communications System, 1993 vol. 2, pp. 13-14-13-17.

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