Radio IC card system

Details Radio IC card system Radio IC card system

1997-04-10

2000-01-25

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

235382, 455 78, 34082531, H04B 700

Patent

active

060186410

ABSTRACT:
A radio IC card system includes an IC card and a toll collector. When an automobile with the IC card passes by a tollgate, the toll collector installed in the tollgate transmits a first radio signal which is spread modulated using a pseudorandom noise (PN) code from an antenna. The first radio signal is received by the antenna of the IC card and is transmitted to a surface acoustic wave (SAW) correlator. The SAW correlator extracts a PN code included in the received signal, and outputs a peak signal. An accumulation circuit accumulates the peak signal. A threshold discharger is activated to switch on a relay switch when the output voltage of the accumulation circuit exceeds a constant value. Thereby, the voltage of a battery is supplied to a data communication unit. Then, the identification code of the IC card and a record of tollgates by which the automobile has passed are transmitted via radio signal to the toll collector.

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"A Card-size SS Demodulator Using a 2.4GHz Front-end SAW Correlator", The Institute of Electronics Information and Communication Engineers, Y. Maruta, et al., pp. 13-18 (with an English translation).

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