| 摘要 |
A radio-frequency tag communication device arranged to transmit a transmitted signal toward a radio-frequency tag and to receive a reply signal transmitted from the radio-frequency tag in response to the transmitted signal, for thereby effecting radio communication with the radio-frequency tag, the radio-frequency tag communication device including (a) a receiver portion including a receiver antenna device which has a plurality of receiver antenna elements for receiving the reply signal from the radio-frequency tag, (b) a reception-directivity control portion which controls the directivity of reception of the receiver portion device, by controlling the phase of a received signal which is received by each of the plurality of receiver antenna elements and which may include a leakage signal which is a part of the transmitted signal, (c) a modulated-component extracting portion which extracts a modulated component of the received signal which is modulated by the radio-frequency tag, and (d) a direction detecting portion which detects the direction in which the radio-frequency tag is located, on the basis of the modulated component extracted by the modulated-component extracting portion.
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