How can I avoid signal interference with fixed RFID readers?

Signal interference in RFID systems often stems from environmental factors like metal, liquids, or competing wireless devices. Here’s how to resolve common issues:

1. ​Choose the Right Antenna Type
   • ​Circular-Polarized Antennas  minimize reflections in metal-rich environments (e.g., warehouses with steel shelves).
   • ​Near-Field Antennas reduce signal absorption when scanning liquids or tagged items in bottles.
2. ​Adjust Antenna Placement
   • Mount antennas ​**≥50 cm (20 inches)** away from metal surfaces.
   • Angle antennas ​15–30° downward to focus signals on tagged items (e.g., pallets on conveyors).
3. ​Optimize Frequency Settings
   • Enable ​Frequency Hopping Spread Spectrum (FHSS) to comply with regional regulations (e.g., 902–928 MHz in the US).
   • Use ​Dense Reader Mode to prevent cross-talk in multi-reader setups.
4. ​Mitigate Wireless Interference
   • Keep RFID systems ​**≥3 meters** from Wi-Fi routers or Bluetooth devices.
   • Test ambient noise with a ​spectrum analyzer (e.g., Anritsu Site Master).
5. ​Tag Selection & Placement
   • Use ​on-metal RFID tags  for tracking metal assets.
   • Avoid placing tags near seams or edges of liquid containers.

Pro Tip: Validate your setup with a ​handheld RFID reader  to identify dead zones before finalizing installation.

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