Multi-Tech MultiConnect xDot MTXDOT-868 Series, Developer'S Manual

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CHAPTER 5 ANTENNAS
22 MultiConnect
®
xDot
TM
MTXDOT Developer Guide
Chapter 5 Antennas
Antenna System
The LoRa antenna performance depends on the implementation and antenna design. The integration of the
antenna system into the product is a critical part of the design process; therefore, it is essential to consider it early
so the performance is not compromised. If changes are made to the device's certified antenna system, then
recertification will be required.
This radio transmitter has been approved with the antenna types listed below. The antenna used must maintain
the same specifications. The antenna must be of the same type, with similar in-band and out-of-band radiation
patterns. Antenna types not included on this list, or having a greater gain than the maximum gain indicated for the
listed type, are strictly prohibited for use with this device.
U.FL and Trace Antenna Options
If using U.FL or trace antennas, note the following:
■ For a simple trace to RF antennas: Routing must follow standard RF design rules and practices for
stripline/miscrostrip for a 50 ohm impedance line. Use the developer board schematics for a reference
circuit for the a trace antenna.
■
For U.FL antennas: The antenna and cable combination in your design cannot exceed the performance of
the SMA antenna as listed in the next topic.
■ The xDot Developer Board includes an Ethertronics M6200710-1K chip antenna, which by default connects
the xDot to the chip antenna. Only one antenna, either U.FL or chip, may be used at a time. To use the
xDot’s U.FL connector, remove resistor C23 and L1, marked on the following image, to disconnect the chip
antenna.
■ If using a chip antenna in your design, consult your antenna's documentation for placement and design
guidelines.