Wireless IC card and IC card reader communication system

Details Wireless IC card and IC card reader communication system Wireless IC card and IC card reader communication system

1998-04-15

2000-02-08

Lee, Michael G

Registers

Records

Particular code pattern

235492, 34082554, G06K 1906

Patent

active

060219513

ABSTRACT:
In the present wireless card system of the present invention, when data is transmitted from an IC card to a card reader, the IC card changes the load imposed on the transmission system in accordance with the contents of the data, and the card reader detects a reflected wave, which is generated in accordance with a change in the load, and identifies the data. The reflected wave is not a wave emitted by the IC card into the atmosphere, but is an alternating current that relies on the load condition in the transmission system between the transmitter and the receiver, and that is returned from the load in the transmission system. Thus, the reflected wave is not easily affected by the noise field in the vicinity of the antenna, and more precise data transmission is possible.

REFERENCES:
patent: 4797541 (1989-01-01), Billings et al.
patent: 4814595 (1989-03-01), Gilboa
patent: 4845347 (1989-07-01), McCrindle et al.
patent: 5241160 (1993-08-01), Bashan et al.
patent: 5326965 (1994-07-01), Inoue
patent: 5349173 (1994-09-01), Scheckel et al.
patent: 5418358 (1995-05-01), Bruhnke et al.
patent: 5914980 (1999-06-01), Yokota et al.

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