Reader/writer and communication method thereof

Details Reader/writer and communication method thereof Reader/writer and communication method thereof

2006-08-28

2009-02-10

Le, Uyen-Chau N (Department: 2887)

Registers

Records

Conductive

C235S472020, C235S441000, C235S451000

Reexamination Certificate

active

07487921

ABSTRACT:
A reader/writer is provided. The reader/writer performing radio communication with a radio communication terminal in close proximity thereto, includes: an antenna which transmits a carrier wave of a predetermined frequency and which receives a composite wave of the carrier wave and a modulated signal of the carrier wave transmitted from the radio communication terminal; a demodulating unit which demodulates the composite wave received by the antenna; a judging unit which judges whether or not it is difficult to detect a modulated component included in the composite wave received by the antenna when the radio communication terminal is in close proximity; and a carrier-wave control unit which reduces a component of the carrier wave input into the demodulating unit when the judging unit judges that it is difficult to detect the modulated component.

REFERENCES:
patent: 3774209 (1973-11-01), Fleming et al.
patent: 7084739 (2006-08-01), Taki et al.
patent: 2006/0038659 (2006-02-01), Takano et al.
patent: 1489-684 (2004-12-01), None

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