| 摘要 |
A reflected electromagnetic wave received, for example, from a wireless identification IC tag through an antenna (105) is processed not by a complicated circuit, but by capacitors (107, 100) and diodes (108, 109). By the combination of the capacitors (107, 100) and the diodes (108, 109), a voltage of the reflected electromagnetic wave is integrated. The reflected electromagnetic wave becomes different in voltage depending on a signal "0" and a signal "1" from the wireless identification IC tag. As a result, since an integrated value outputted to a reception signal line (113) becomes also different, it is possible to discriminate the signal "0" and the signal "1" in the reader for wireless identification IC tag. Since integration is utilized, even a week signal can be discriminated.
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