| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a communication device that ensures excellent communication using a subcarrier modulation method by avoiding any effects of disturbance waves. <P>SOLUTION: A control section 5 on a reader/writer 1 compares receiving levels at an upper subcarrier frequency band and a lower subcarrier frequency band that are detected by an intermediate frequency detection circuit 19 in a carrier sensing time, and selects either one of the subcarrier frequency bands to demodulate the response signal sent back by the RFID tag 21 from the frequency band with lower receiving level. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
