NON-CONTACT IC CARD READER/WRITER

摘要

PROBLEM TO BE SOLVED: To provide an inexpensive and small non-contact IC card reader/writer capable of improving the efficiency of an amplifier.

SOLUTION: The non-contact IC card reader/writer comprises: a loop antenna for supplying electric power and a transmission signal to a contactless IC card by electromagnetic induction and acquiring a received signal from the contactless IC card by load fluctuation; a first resonance circuit for resonating the loop antenna with a desired first frequency; a radio transmitter for supplying electric power and transmission data to the loop antenna via the first resonance circuit; and further a radio receiver for acquiring the received 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. The radio transmitter and the radio receiver are respectively connected to a CPU, and the radio transmitter includes a configuration wherein a low-pass filter for eliminating a high frequency, a class E amplifier and a modulator are connected in series.

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