Noncontact IC card reader/writer

Details Noncontact IC card reader/writer Noncontact IC card reader/writer

2007-02-27

2007-02-27

Frech, Karl D. (Department: 2876)

Registers

Records

Conductive

C235S487000, C235S380000

Reexamination Certificate

active

10878633

ABSTRACT:
The object of the invention is to provide a small-sized noncontact IC card reader/writer that can enhance the efficiency of an amplifier at a low cost. To achieve the object, in the invention, a loop antenna that supplies electric power and a send signal to a noncontact IC card by electromagnetic induction and acquires a receive signal from the noncontact IC card by load fluctuation, a first resonance circuit for resonating the loop antenna with a desired first frequency, a radio transmitter that supplies electric power and send data to the loop antenna via the first resonance circuit and further, a radio receiver that acquires the receive signal from the loop antenna via a second resonance circuit connected to the loop antenna via a coupling capacitor and resonated with a desired second frequency are provided, the radio transmitter and the radio receiver are respectively connected to CPU, and a low-pass filter for removing a high frequency, a class E amplifier and a modulator are connected to the radio transmitter in series.

REFERENCES:
patent: 2002/0014529 (2002-02-01), Tanaka
patent: 10256957 (1998-09-01), None
patent: 2002007976 (2002-01-01), None

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