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SmartX Launches Multilinear RFID Portals
The technology, which gathers multiple antennas in different positions, allows readings where the exact positions of tags cannot be guaranteed, and at a lower cost.
Circularly polarized antennas allow RFID tag readings at shorter distances and wider reading angles. For the reading to take place efficiently, the tag can be positioned vertically or horizontally, always in relation to the same antenna positioning.
However, Moreira explains, tags positioned perpendicular to the antenna plane (horizontal for top antennas or vertical for side antennas) may have their readings impaired. One commonly used technique for reading tags perpendicular to the plane of a portal's side antennas is the adoption of antennas on the top, leaving the antennas positioned on the sides to ensure the coverage of tags positioned vertically and horizontally.
Examples of applications using circular-polarization antennas include airport baggage-scanning solutions. "You never know the position of the RFID tag that should be read," Moreira says. "Whether vertically or horizontally, the tag is likely to be read by one of the numerous strategically placed circularly polarized antennas."
With the adoption of RF signal-confinement techniques, it becomes possible to limit the read zone and adopt higher signal strength in RFID interrogators without reading tags in neighboring read zones. Attempts to deploy this technology in the past have not been successful in Brazil, however.
"With the expertise and practical experience of SmartX's technicians, we took the challenge," Moreira states. "Now, the portals are offering results. Therefore, the adoption of multilinear antennas is not new in Brazil. The novelty is the implementation and proper manufacture of the portals."
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