RFID system, gate arrangement with RFID system and method of detecting transponders
First Claim
1. An RFID system for communicating between reading units and transponders in at least two different scan areas, the system comprising:
- at least one reading unit for each scan area; and
at least one directional antenna for each scan area, each directional antenna being configured to communicate with the reading unit for the radiation of electromagnetic signals to the scan area, the directional antennas of different scan areas having main radiating directions turned to each other being configured with opposing polarization rotation directions to mitigate the energy transfer between the directional antennas of the at least two different scan areas.
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Accused Products
Abstract
With an RFID system for communicating between reading units (R1, R2) and transponders (T1, T2) in at least two different scan areas (S1, S2), wherein at least one reading unit (R1, R2) and at least one antenna (A1-A4, B1-B4) communicating with the reading unit are allocated to each scan area (S1, S2) for the radiation of electromagnetic signals (EA1-EA4, EB1-EB4) in the scan area (S1, S2), the antennas (A1-A4, B1-B4) are designed in such a way that at least one antenna (A1, A3) of a scan area (S1) has a different polarization and/or a different polarization rotation direction relative to at least one antenna (B2, B4) of another scan area (S2).
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Citations
18 Claims
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1. An RFID system for communicating between reading units and transponders in at least two different scan areas, the system comprising:
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at least one reading unit for each scan area; and at least one directional antenna for each scan area, each directional antenna being configured to communicate with the reading unit for the radiation of electromagnetic signals to the scan area, the directional antennas of different scan areas having main radiating directions turned to each other being configured with opposing polarization rotation directions to mitigate the energy transfer between the directional antennas of the at least two different scan areas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. A method of detecting transponders in at least two different scan areas, wherein at least one reading unit communicating with the transponders and at least one directional antenna communicating with the reading unit are allocated to each scan area for the radiation of electromagnetic signals to the scan area, wherein electromagnetic signals radiated over directional antennas of different scan areas whose main radiating directions are turned to each other have opposing polarization directions to minimize the energy transfer between the directional antennas of the at least two different scan areas.
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11. An RFID system for communicating between reading units and transponders in at least two different scan areas, the system comprising:
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at least one reading unit for each scan area; and at least one directional antenna for each scan area, each directional antenna being configured to communicate with the reading unit for the radiation of electromagnetic signals to the scan area, the directional antennas of different scan areas having main radiating directions turned to each other being configured with opposing polarization rotation directions to mitigate the energy transfer between the directional antennas of the at least two different scan areas, wherein for each scan area the at least one reading unit is configured to monitor channels associated with frequency bands received at a first directional antenna for the scan area, in response to detecting a signal on a channel having polarization direction that is the same as the polarization direction used by the first directional antenna, detecting the channel as being occupied, and in response to detecting a signal on a channel having polarization direction that is opposite the polarization direction used by the first directional antenna, detecting the channel as being unoccupied.
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12. An RFID reader system comprising:
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a first gate apparatus including a first reader and first and second directional antennas configured and arranged to communicate with RFID tags on items passed between the first and second directional antennas, by respectively transmitting RFID signals of opposite polarization rotation that reach the other one of the first and second directional antennas in a radiation direction that is detectable thereby; and a second gate apparatus including a second reader and third and fourth directional antennas configured and arranged to communicate with RFID tags on items passed between the third and fourth directional antennas, by respectively transmitting RFID signals of opposite polarization rotation that reach the other one of the third and fourth directional antennas in a radiation direction that is detectable thereby, the second reader and fourth directional antenna being configured to transmit RFID signals that reach the first directional antenna in a radiation direction that is detectable by the first directional antenna, and have a polarization rotation that is opposite the polarization rotation of RFID signals transmitted by the first directional antenna, to mitigate reception, by the first directional antenna, of RFID signals transmitted from the fourth directional antenna. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification