READER/WRITER APPARATUS

摘要

In a reader/writer apparatus using loop antennas to perform a non-contact communication, the loop antennas are effectively used.There are included resonant frequency changing means (C1,D1,C2,D2) for changing the resonant frequencies of the respective loop antennas (E1,E2) when communication means (1,2,3) selectively use one of the loop antennas so as to perform a non-contact communication. The control means (1,2,3) controls the resonant frequency changing means such that the resonant frequency of the loop antenna to be used for the non-contact communication is different from that of the other one.