Wireless IC tag reader
First Claim
Patent Images
1. A wireless IC tag reader comprising:
- a receiving antenna with a maximum beam direction and a half-value angle;
a transmitting antenna with a maximum beam direction and a half-value angle narrower than the half-value angle of the receiving antenna; and
a maximum beam direction changing unit that changes the maximum beam direction of the transmitting antenna without changing the half-value angle of the transmitting antenna,wherein a main lobe of the receiving antenna encompasses the whole space in a communication region limited by a floor surface and a wall surface,andthe maximum beam direction changing unit changes the maximum beam direction of the transmitting antenna such that a main lobe of the transmitting antenna encompasses a wireless IC tag in the communication region without encompassing the floor surface and the wall surface in the communication region.
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Abstract
A wireless IC tag reader includes a receiving antenna, a transmitting antenna and a beam direction control unit. The receiving antenna has a maximum beam direction and a half-value angle. The transmitting antenna has a maximum beam direction and a half-value angle narrower than the half-value angle of the receiving antenna. The beam direction control unit changes the maximum beam direction of the transmitting antenna.
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Citations
8 Claims
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1. A wireless IC tag reader comprising:
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a receiving antenna with a maximum beam direction and a half-value angle; a transmitting antenna with a maximum beam direction and a half-value angle narrower than the half-value angle of the receiving antenna; and a maximum beam direction changing unit that changes the maximum beam direction of the transmitting antenna without changing the half-value angle of the transmitting antenna, wherein a main lobe of the receiving antenna encompasses the whole space in a communication region limited by a floor surface and a wall surface, and the maximum beam direction changing unit changes the maximum beam direction of the transmitting antenna such that a main lobe of the transmitting antenna encompasses a wireless IC tag in the communication region without encompassing the floor surface and the wall surface in the communication region. - View Dependent Claims (2, 3, 5, 6)
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4. A wireless IC tag reader comprising:
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a receiving antenna with a maximum beam direction and a half-value angle; transmitting antennas each with a maximum beam direction and a half-value angle narrower than the half-value angle of the receiving antenna; and a maximum beam direction changing unit that changes the maximum beam directions of the transmitting antennas without changing the half-value angles of the transmitting antennas such that the maximum beam directions differ from each other, wherein a main lobe of the receiving antenna encompasses the whole space in a communication region limited by a floor surface and a wall surface, and the maximum beam direction changing unit changes the maximum beam direction of each of the transmitting antennas such that a main lobe of one of the transmitting antenna encompasses a wireless IC tag in the communication region without encompassing the floor surface and the wall surface in the communication region. - View Dependent Claims (7, 8)
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Specification