Transmitter-receiver for non-contact IC card system

Details Transmitter-receiver for non-contact IC card system Transmitter-receiver for non-contact IC card system

1996-01-11

1997-12-30

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

34082536, 342 42, H04Q 000

Patent

active

057035733

ABSTRACT:
In a non-contact IC card system which transmits and receives signals between an interrogator and a transponder, a transmitter-receiver used for the interrogator comprises a distance detecting means for detecting the distance between the interrogator and the transponder, and an output control means for controlling the output level of the interrogator in accordance with the signals detected by the distance detecting means, so as to keep the receiving level of the transponder within the range of a given value. The receiving level in the transponder can be prevented from varying depending on the distance between the interrogator and the transponder, so that it becomes unnecessary to provide a protective circuit against an excessive increase of the receiving level. The optimum threshold voltage can also be prevented from varying.

REFERENCES:
patent: 4384288 (1983-05-01), Walton
patent: 4804961 (1989-02-01), Hane
patent: 4851820 (1989-07-01), Fernandez
patent: 5012236 (1991-04-01), Troyk et al.
patent: 5084699 (1992-01-01), De Michele
patent: 5198807 (1993-03-01), Troyk et al.
patent: 5298904 (1994-03-01), Olich
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patent: 5537105 (1996-07-01), Marsh et al.
patent: 5602535 (1997-02-01), Boyles et al.
patent: 5621412 (1997-04-01), Sharpe et al.

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