| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wireless tag communication apparatus having a simple structure that can remove sneak signals from a transmitter end. <P>SOLUTION: The wireless tag communication apparatus includes: a first cancel signal output part 24 for outputting a first cancel signal for removing sneak signals included in reply signals transmitted from a transmitter end; a first cancel signal control part 26 for controlling the amplitude and phase of the first cancel signal outputted from the first cancel signal output part 24; a first cancel signal D/A converter part 54 for converting the first cancel signal to the analog signal; and a first signal combining part 58 for combining the first cancel signal as analog converted with a received signal. This eliminates the need for a phase shifter that controls the first cancel signal, and further facilitates the control thereof by use of digital signal processing. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
