| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wireless tag communication apparatus having a simple structure that can favorably remove sneak signals from a transmitter end regardless of their signal levels. <P>SOLUTION: The wireless tag communication apparatus can favorably remove the sneak signals even when the signals are comparatively small, since the apparatus includes a first cancel signal output part 24 for outputting, as a digital signal, a first cancel signal for removing the sneak signals from the transmitter end included in a received signal; a first cancel signal D/A converter 54 for converting the output of the output part 24 to an analog signal; a first cancel signal control unit 26 for outputting a control signal for controlling the amplitude and/or phase of the first cancel signal; a first cancel signal attenuator 55 for attenuating the first cancel signal converted to the analog signal by the converter 54 to an amplitude corresponding to the sneak signals from the transmitter end; and a first signal combining part 58 for combining the output of the signal attenuator 55 with the received signal. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
