Pulse or digital communications – Transceivers
Patent
1997-09-15
1999-10-12
Pham, Chi H.
Pulse or digital communications
Transceivers
34082554, 235375, 235449, H04B 138, H04L 516
Patent
active
059664045
ABSTRACT:
A reader/writer transmits power and modulated data to a no-battery information storage medium having a communication function in a noncontact state, and receives modulated data from the no-battery information storage medium. The reader/writer has a driver, a loop antenna, and a current detection unit. The driver transmits the power and the modulated data. The loop antenna is connected to the output line of the driver. The current detection unit is arranged between the loop antenna and the output line of the driver. While the reader/writer supplies a transmission carrier current from the driver to the loop antenna, if it receives the modulated data from the no-battery information storage medium, it uses the current detection unit to extract, as a reception signal, a change in transmission carrier current of the loop antenna caused by the modulated data signal received by the loop antenna.
REFERENCES:
patent: 4924171 (1990-05-01), Baba et al.
patent: 5113184 (1992-05-01), Katayama
patent: 5418353 (1995-05-01), Katayama et al.
patent: 5751765 (1998-05-01), Matsubara
Iwata Kazuki
Sudo Kiyohito
Yokota Tsuneshi
Corrielus Jean B
Kabushiki Kaisha Toshiba
Pham Chi H.
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