Radio-frequency identification tag communication device
First Claim
1. A radio-frequency identification tag communication device for radio communication with a radio-frequency identification tag, by transmitting a transmission signal from a transmitter antenna toward the radio-frequency identification tag, and receiving a reply signal transmitted from the radio frequency identification tag in response to the transmission signal, through a receiver antenna comprising a plurality of antenna elements, said radio-frequency identification tag communication device comprising:
- a directivity control portion configured to control a directivity of said transmitter antenna comprising a plurality of antenna elements; and
an adaptive weight control portion configured to implement an adaptive control of a weight given to a received signal received by each of said plurality of antenna elements of said receiver antenna comprising a plurality of antenna elements, and a weight given to said transmission signal transmitted from each of said plurality of antenna elements of said transmission antenna;
wherein said directivity control portion is configured to control at least one of a phase and an amplitude of a transmission signal transmitted from each of said plurality of antenna elements, for thereby controlling the directivity of the transmitter antenna andwherein the transmission signals respectively transmitted from said plurality of antenna elements of said transmitter antenna and the received signals respectively received by said plurality of antenna elements of said receiver antenna have a same frequency, said adaptive weight control portion controls the weight given to the said received signals, such that the weight given to said received signals is different from the weight given to the said transmission signals.
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Accused Products
Abstract
A radio-frequency identification tag communication device including a BFA weight-value setting portion operable to control a directivity of a transmitter antenna, and an adaptive processing portion operable to implement an adaptive control of a weight to be given to a received signal received by each of a plurality of antenna elements, on the basis of a reply signal transmitted from a radio-frequency identification tag, so that the directivity of the transmitter antenna is changed to a direction in which the frequency identification tag in question is expected to exist, and the weight to be given to each received signal is subjected to the adaptive control, whereby the sensitivity of communication of the communication device with the radio-frequency identification tag is improved.
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Citations
13 Claims
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1. A radio-frequency identification tag communication device for radio communication with a radio-frequency identification tag, by transmitting a transmission signal from a transmitter antenna toward the radio-frequency identification tag, and receiving a reply signal transmitted from the radio frequency identification tag in response to the transmission signal, through a receiver antenna comprising a plurality of antenna elements, said radio-frequency identification tag communication device comprising:
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a directivity control portion configured to control a directivity of said transmitter antenna comprising a plurality of antenna elements; and an adaptive weight control portion configured to implement an adaptive control of a weight given to a received signal received by each of said plurality of antenna elements of said receiver antenna comprising a plurality of antenna elements, and a weight given to said transmission signal transmitted from each of said plurality of antenna elements of said transmission antenna; wherein said directivity control portion is configured to control at least one of a phase and an amplitude of a transmission signal transmitted from each of said plurality of antenna elements, for thereby controlling the directivity of the transmitter antenna and wherein the transmission signals respectively transmitted from said plurality of antenna elements of said transmitter antenna and the received signals respectively received by said plurality of antenna elements of said receiver antenna have a same frequency, said adaptive weight control portion controls the weight given to the said received signals, such that the weight given to said received signals is different from the weight given to the said transmission signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification