RADIO-FREQUENCY TAG COMMUNICATION DEVICE
First Claim
1. 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 said radio-frequency tag in response to said transmitted signal, for thereby effecting radio communication with said radio-frequency tag, said radio-frequency tag communication device comprising:
- a receiver portion including a receiver antenna device which has a plurality of receiver antenna elements for receiving said reply signal from said radio-frequency tag;
a reception-directivity control portion configured to control a directivity of reception of said receiver portion, by controlling a phase of a received signal which is received by each of said plurality of receiver antenna elements and which may include a leakage signal which is a part of said transmitted signal;
a modulated-component extracting portion configured to extract a modulated component of said received signal which is modulated by said radio-frequency tag; and
a direction detecting portion configured to detect a direction in which said radio-frequency tag is located, on the basis of said modulated component extracted by said modulated-component extracting portion.
1 Assignment
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Accused Products
Abstract
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.
19 Citations
10 Claims
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1. 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 said radio-frequency tag in response to said transmitted signal, for thereby effecting radio communication with said radio-frequency tag, said radio-frequency tag communication device comprising:
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a receiver portion including a receiver antenna device which has a plurality of receiver antenna elements for receiving said reply signal from said radio-frequency tag; a reception-directivity control portion configured to control a directivity of reception of said receiver portion, by controlling a phase of a received signal which is received by each of said plurality of receiver antenna elements and which may include a leakage signal which is a part of said transmitted signal; a modulated-component extracting portion configured to extract a modulated component of said received signal which is modulated by said radio-frequency tag; and a direction detecting portion configured to detect a direction in which said radio-frequency tag is located, on the basis of said modulated component extracted by said modulated-component extracting portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification