| 摘要 |
<p>PURPOSE:To provide a non-contact IC card capable of communication with an external device provided with a different communication frequency. CONSTITUTION:This card is provided with a frequency variable antenna circuit 10a and a frequency switching circuit 14 for supplying, frequency variable clock signals for the communication to a modem circuit 8. The constant of the antenna circuit 10 and the frequency of the clock signals for the communication generated from the frequency switching circuit are switched corresponding to the frequency of the external device of a communicating party and the communication is performed.</p> |
