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RFID Passive and Active Tags: What You Need to Know
70Learn the key differences between RFID passive and active tags, how they work, and where each type is used. Find out which RFID tag suits your project best.
MoreHow do I set up a multi-reader RFID system for full warehouse coverage?
Deploying multiple RFID readers in a warehouse requires strategic planning to avoid interference and ensure seamless tracking. Follow these steps for optimal coverage:
1. Map Warehouse Zones & Tag Density
- Divide the warehouse into zones: Receiving, storage aisles, packing stations, and exits.
- Estimate tag density: High-density zones (e.g., pallet racks) need focused coverage, while open areas require broader beams.
2. Select Readers & Antennas by Zone
- High-Density Zones: Use fixed UHF RFID readers with circular-polarized antennas for multi-angle scanning.
- Wide-Area Zones: Deploy long-range linear-polarized antennas (10–15m range) for conveyor belts or dock doors.
3. Position Readers to Minimize Overlap
- Height & Angle:
- Mount readers 3–6 meters high angled downward (15–30°) to cover pallets/shelves.
- In aisles, stagger readers every 10–20 meters depending on antenna beamwidth.
- Avoid Metal Obstructions: Keep antennas 50cm away from metal beams or shelves to reduce signal reflection.
4. Configure Anti-Collision & Frequency Hopping
- Use RFID multiplexers to alternate reader activation, preventing signal clashes in overlapping zones.
- Enable frequency hopping (FHSS) to comply with regional UHF regulations (e.g., FCC in the US, ETSI in EU).
5. Integrate with Warehouse Software
- Connect readers via PoE switches to a central server running RFID middleware (e.g., Impinj Speedway Connect).
- Map reader IDs to zones in your WMS (e.g., SAP EWM) for real-time location tracking.
6. Test & Optimize Coverage
- Use a handheld RFID scanner to validate dead zones.
- Adjust antenna angles or add RFID repeaters in low-signal areas.
Pro Tip: For large warehouses, combine fixed readers with mobile RFID carts for flexible spot checks.
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