Antenna recommendations Antenna placement
Digi XBee3 Cellular LTE-M/NB-IoT Global Smart Modem User Guide
111
Antenna placement
Antenna location is important for optimal performance. The following suggestions help you achieve
optimal antenna performance. See Regulatory information for details on cellular and Bluetooth
antennas that you may use with the XBee Smart Modem.
Keep the antenna(s) as far away from metal objects and other electronics (including the XBee Smart
Modem) as possible. Metal objects near the antenna cause parasitic coupling and detuning, preventing
the antenna from radiating efficiently. Metal objects between the transmitter and receiver can also
block the radiation path or reduce the transmission distance. Some objects that are often overlooked
are:
n Metal poles
n Metal studs or beams in structures
n Concrete (reinforced with metal rods)
n Metal enclosures
n Vehicles
n Elevators
n Ventilation ducts
n Batteries
n Tall electrolytic capacitors
Often, small antennas are desirable, but may come at the cost of reduced range and efficiency.
If you implement the Bluetooth interface, ensure that the Bluetooth and cellular antennas are at least
3 inches apart (6 inches recommended) to prevent cellular sensitivity from being degraded.
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